CN116592797B - A spring flatness detection device - Google Patents

Abstract

The invention relates to the technical field of spring detection, in particular to a spring flatness detection device which comprises a base and detection clamping assemblies arranged on the base, wherein the detection clamping assemblies comprise four first detection clamping assemblies, second detection clamping assemblies, third detection clamping assemblies and fourth detection clamping assemblies which are identical in structure, the first detection clamping assemblies and the second detection clamping assemblies are arranged at two ends of a spring to be detected in pairs, the spring to be detected is clamped along a first direction, the periphery of the spring to be detected is clamped through the detection clamping assemblies, and the contact states of the side surfaces of different circle layers of the spring and the detection clamping assemblies are judged through photoelectric detection assemblies, so that the flatness of the spring to be detected is judged.

Description

A spring flatness detection device

Technical field

The invention relates to the technical field of spring detection, specifically a spring flatness detection device.

Background technique

Spring shock absorbers are widely used in electric vehicles, bicycles, automobiles and other fields. The stiffness parameters of spring shock absorbers need to be obtained through experimental testing. As the main component of the spring shock absorber, the spring is a mechanical part that uses elasticity to work. Parts made of elastic materials deform under the action of external forces. After the spring production is completed, the necessary performance inspection of the spring is required to ensure that it reaches Eligibility criteria.

During the production of springs, due to fluctuations in equipment, there will be errors in the spiral diameter of each turn of spring steel when winding the spring steel. In the following stringent spring usage environments, due to the different turns of the spring, Fluctuations in the diameter of the spring will easily cause deformation and bending of the spring when the spring is compressed. Therefore, it is necessary to detect the flatness of the spring to ensure that the error in the spiral diameter of each turn of the spring is within the allowable range, and then Ensure the quality and safety of springs.

Contents of the invention

In view of the shortcomings of the prior art, the present invention provides a spring flatness detection device. The spring to be tested is clamped around the spring through the detection clamping component, and the photoelectric detection component is used to determine whether the sides of the spring at different coil layers are in contact with the detection clamp. Hold the contact state of the component to determine the straightness of the spring to be tested.

In the prior art, hydraulic cylinders are usually used to provide clamping force. It is well known that the driving force of the hydraulic cylinder can provide good elastic buffering when driving the clamping device. However, precise synchronous control is required when clamping the spring to be tested from different directions around. , the synchronous control of hydraulic cylinders is a problem that must be solved.

In order to achieve the above objects, the present invention provides the following technical solutions:

A spring flatness detection device includes a base and a detection clamping assembly arranged on the base. The detection clamping assembly includes four first detection clamping assemblies and a second detection clamping assembly with the same structure. The third detection clamping assembly and the fourth detection clamping assembly, the first detection clamping assembly and the second detection clamping assembly are arranged in pairs at both ends of the spring to be tested, clamping the said Spring to be tested;

The third detection clamping component and the fourth detection clamping component are arranged in pairs at both ends of the spring to be tested, and clamp the spring to be tested along the second direction. The first direction and the second direction Orientation vertical;

A light source emitting assembly and a light source receiving assembly are provided near the first detection clamping assembly, the second detection clamping assembly, the third detection clamping assembly and the fourth detection clamping assembly, and the light source emitting assembly faces the Detect the contact position between the clamping component and the spring to be tested and emit light. The light source receiving component receives the light emitted by the light source emitting component, and detects the flatness of the spring to be tested according to the distribution of the received light. ;

The spring to be tested is clamped and fixed on a rotating base, and the rotating base can rotate relative to the base. The detection position of the spring to be tested is changed through the rotation of the rotating base.

Further, the first detection and clamping assembly includes a first driving rack plate, a first transmission gear set, a first clamping detection plate, a first clamping part and a first driving hydraulic cylinder; the first transmission gear The set includes a first drive gear, a first guide gear, a first input gear and a first transmission wheel; the base includes a support base plate, an upper end cover and a lower support base; the first drive rack plate is slidable through a guide structure Disposed on the upper end surface of the support base plate, both sides of the first driving rack plate mesh with the first driving gear and the first guide gear respectively; the first driving gear and the first transmission wheel are coaxially arranged and respectively arranged On the upper end face and lower end face of the support base plate, the first input gear meshes with the first transmission wheel; the cylinder base of the first driving hydraulic cylinder is rotatably hingedly arranged on the lower end face of the support base plate, so The end of the piston rod of the first driving hydraulic cylinder is connected to the end surface of the first input gear through a hinge structure; the first driving hydraulic cylinder can drive the first input gear to reciprocally rotate at a certain angle, and the first input gear passes through the first input gear. The rotation of a speed change wheel and the first driving gear drives the first driving rack plate to reciprocate on the supporting base plate.

Further, the upper end cover is provided with an escape portion that guides the movement of the clamping detection plate of the detection clamping assembly, and the lower end of the support base plate is provided with a lower support seat.

Further, the third detection and clamping assembly has the same structure as the first detection and clamping assembly and includes a third driving rack plate, a third transmission gear set, a third clamping detection plate, and a third clamping part. and a third drive hydraulic cylinder; the third transmission gear set includes a third drive gear, a third guide gear, a third input gear and a third transmission wheel; one end of the first drive rack plate is provided with a first clamp A first clamping detection plate is also provided vertically above the first driving rack plate. The first clamping detection plate and the first clamping part can abut against the spring to be tested. The first detection position on the circumferential side; a third clamping portion is provided at one end of the third drive rack plate close to the first drive rack plate, and is arranged vertically above the third drive rack plate There is a third clamping detection plate, and the third clamping detection plate and the third clamping part can abut the second detection position on the circumferential side of the spring to be tested; the first detection position and the second detection position are The positions are located on opposite sides of the spring to be tested, and the plane determined by the first detection position and the second detection position passes through the central axis of the spring to be tested.

Further, the lower end surface of the support base plate is also provided with a rotatable first synchronization member, and a first rack segment and a second rack segment are provided at opposite positions on the first synchronization member; A rack segment is meshed with the first transmission wheel, and the second rack segment is meshed with the third transmission wheel; the first clamping detection plate and the third clamping plate are made to operate through the first synchronizing member. Detects synchronized side/opposite movement of the boards.

Further, the second detection clamping component and the fourth detection clamping component are arranged oppositely and have the same structure as the first detection clamping component and the third detection clamping component; the lower end of the support base plate can also be A second synchronizing member is provided for rotation, and a third rack segment and a fourth rack segment are provided at opposite positions on the second synchronizing member; the third rack segment and the second detection clamp The second speed change wheel of the assembly is engaged, and the fourth rack segment is engaged with the fourth speed change wheel of the fourth detection and clamping assembly;

When the second driving hydraulic cylinder of the second detection and clamping assembly and the fourth driving hydraulic cylinder of the fourth detection and clamping assembly drive the second input gear and the fourth input gear to rotate respectively, the second speed change is achieved through the second synchronization member. The synchronous rotation of the wheel and the fourth speed change wheel enables the second clamping detection plate of the second detection and clamping assembly and the fourth clamping detection plate of the fourth detection and clamping assembly to move synchronously towards/back to each other.

Further, the rotating base includes a rotating base, a limiting plate, a clamping plate, an abutment plate and a clamping spring; a plurality of limiting plates are provided on the rotating base, and a plurality of the limiting plates cover is provided on the inner periphery of the spring to be tested; the clamping plate is slidably arranged relative to the limiting plate, and a clamping spring is arranged between the clamping plate and the abutting plate, and the clamping spring moves the The clamping plate provides a clamping force moving toward the limiting plate.

Further, the rotating base is provided on the lower support base, and the rotating base can rotate relative to the supporting base plate, thereby changing the clamping detection plate of the detection clamping assembly on the spring to be tested. detection position.

Further, the light source emitting assembly includes a light source base and a light curtain emitting member, and the light source receiving assembly includes a connecting base and a light curtain receiving member; the light source base is provided on the driving rack plate of the detection clamping assembly. The light source base is provided with a vertical light curtain emitting member adjacent to the position where the detection plate is clamped, and the extension direction of the light curtain emitting member is parallel to the clamping surface of the detection plate; the light source The connection base of the receiving component is symmetrically arranged with the light source base on both sides of the clamping detection board, and a light curtain receiving member is provided on the connection base.

Further, the light curtain emitting member emits light toward the contact position between the clamping detection plate and the spring to be measured, and the light curtain receiving member receives the light emitted by the light curtain emitting member; the light curtain receiving member receives The distribution of the light is detected to determine the contact between the side surface of the spring to be tested and the clamping detection plate, and then the straightness of the spring to be tested is determined.

Compared with the existing technology, the present invention provides a spring flatness detection device, which has the following beneficial effects:

1. The present invention provides the clamping driving force of the first, second, third and fourth detection clamping components through the hydraulic cylinder, which can provide good buffering force when clamping the spring to be tested, and at the same time, through the first, third The relative arrangement of the detection clamping components and the relative arrangement of the second and fourth detection clamping components can effectively avoid the positional dislocation of each coil layer of the spring to be tested due to the clamping force.

2. The first and third detection and clamping assemblies of the present invention can be synchronously controlled in movement through the first synchronizing member, and the second and fourth detecting and clamping assemblies can be synchronously controlled in movement through the second synchronizing member, thereby effectively Solve the problem of asynchronous driving of the hydraulic cylinder, so that the detection clamping assembly can synchronously contact both sides of the spring, thereby ensuring detection accuracy.

3. The rotating seat of the present invention can fixedly support the bottom end of the spring to be tested, and can also rotate relative to the base, thereby enabling the first, second, third and fourth detection clamping assemblies to be clamped around the spring to be tested. Any position can ensure multi-point sampling of the spring to be tested and ensure the accuracy of spring flatness detection.

4. The present invention uses the principle of light blocking to detect the positions of different circles on the side of the spring to be tested and detect the contact status of the clamping component, emits evenly distributed light through the light source emitting component, and receives the spring to be tested through the light source receiving component The distribution of the light source after occlusion is used to determine the contact between the spring to be tested and the detection clamping component, so as to detect the flatness of the spring.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of the spring flatness detection device of the present invention;

Figure 2 is a cross-sectional view of the detection device of the present invention;

Figure 3 is a transverse cross-sectional view of the detection device of the present invention;

Figure 4 is a schematic diagram of the internal structure of the base of the present invention;

Figure 5 is a schematic diagram of the transmission structure of the first and third detection and clamping components of the present invention;

Figure 6 is a schematic diagram of the overall structure of the transmission structure of the present invention;

Figure 7 is a cross-sectional view of the rotating seat of the present invention;

Figure 8 is a schematic diagram of the light source transmitting and receiving components of the present invention;

In the picture:

The first detection clamping assembly 1, the first driving rack plate 11, the first driving gear 12, the first guide gear 13, the first clamping detection plate 14, the first clamping part 15, the first input gear 16, A speed change wheel 17 and a first driving hydraulic cylinder 18;

the second detection and clamping assembly 2, the second input gear 26, the second transmission wheel 27, and the second driving hydraulic cylinder 28;

The first synchronizing member 100, the first rack segment 101, and the second rack segment 102; the second synchronizing member 200, the third rack segment 201, and the fourth rack segment 202;

The third detection clamping assembly 3, the third driving rack plate 31, the third guide gear 33, the third clamping detection plate 34, the third clamping part 35, the third input gear 36, the third transmission wheel 37, the third Three drive hydraulic cylinder 38;

The fourth detection and clamping assembly 4, the fourth input gear 46, the fourth transmission wheel 47, and the fourth driving hydraulic cylinder 48;

Spring to be tested 5;

Base 6, support base plate 61, upper end cover 62, lower support seat 63;

Rotating seat 7, rotating base 71, limiting plate 72, clamping plate 73, abutting plate 74, clamping spring 75;

Light source emitting component 8, light source base 81, light curtain emitting component 82;

Light source receiving component 9, light curtain receiving component 92;

Implementation

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The present invention will be described in detail below based on Figures 1-8. A spring flatness detection device of the present invention includes a base 6 and a detection clamping assembly disposed on the base 6. The detection clamping assembly includes There are four first detection clamping components 1, second detection clamping components 2, third detection clamping components 3 and fourth detection clamping components 4 with the same structure. The clamping components 2 are arranged in pairs at both ends of the springs 5 to be tested, and clamp the springs 5 to be tested along the first direction;

The third detection clamping component 3 and the fourth detection clamping component 4 are arranged in pairs at both ends of the spring to be tested 5, and clamp the spring to be tested 5 along the second direction. The first direction and The second direction is vertical;

A light source emitting component 8 and a light source receiving component 9 are provided near the first detection clamping component 1, the second detection clamping component 2, the third detection clamping component 3 and the fourth detection clamping component 4. The light source emitting component 8 emits light toward the contact position between the detection clamping component and the spring to be measured 5. The light source receiving component 9 receives the light emitted by the light source emitting component 8, and determines the distribution of the light according to the distribution of the received light. Detect the straightness of the spring to be tested 5;

The spring to be tested 5 is clamped and fixed on the rotating base 7 , and the rotating base 7 can rotate relative to the base 6 . The detection position of the spring to be tested 5 is changed by the rotation of the rotating base 7 .

The fluctuation of the spiral diameter of each turn of the spring 5 to be tested will cause the straightness of the spring 5 to be tested to exceed the standard. When the spring 5 to be tested is surrounded by the first detection clamping component 1 and the second detection clamping component 2 , when the third detection clamping component 3 and the fourth detection clamping component 4 are in contact, the coil layer with a larger spiral diameter is in contact with the detection clamping component, while the coil layer with a smaller spiral diameter is not in contact with the detection clamp. The light source emitting component 8 is in contact with the holding component, and the light emitted by the light source emitting component 8 can pass through the gap between the circle layer with a smaller spiral diameter and the detection clamping component, and thereby be received by the light source receiving component 9. At the same time, the emitted light will be emitted by the circle with a larger spiral diameter. It is blocked by the layer and cannot be received by the light source receiving component 9 at the position of the circle layer. Since the light source emitting component 8 emits uniformly distributed light, it can be determined according to the distribution of the light received by the light source receiving component 9 The size of the spiral diameter of each coil layer of the spring 5 is measured to determine the overall straightness of the spring 5 to be measured.

Further, the first detection and clamping assembly 1 includes a first driving rack plate 11, a first transmission gear set, a first clamping detection plate 14, a first clamping part 15 and a first driving hydraulic cylinder 18; The first transmission gear set includes a first drive gear 12, a first guide gear 13, a first input gear 16 and a first transmission wheel 17; the base 6 includes a support base plate 61, an upper end cover 62 and a lower support seat 63; The first drive rack plate 11 is slidably disposed on the upper end surface of the support base plate 61 through a guide structure. Both sides of the first drive rack plate 11 engage the first drive gear 12 and the first guide gear 13 respectively. ; The first driving gear 12 and the first speed change wheel 17 are coaxially arranged and respectively provided on the upper end surface and the lower end surface of the support base plate 61, and the first input gear 16 and the first speed change wheel 17 mesh; The cylinder seat of the first driving hydraulic cylinder 18 is rotatably hingedly arranged on the lower end surface of the supporting base plate 61 , and the end of the piston rod of the first driving hydraulic cylinder 18 is connected to the end surface of the first input gear 16 through a hinged structure. Connection; the first driving hydraulic cylinder 18 can drive the first input gear 16 to reciprocate at a certain angle, and the first input gear 16 drives the first driving gear through the rotation of the first transmission wheel 17 and the first driving gear 12 The strips 11 move reciprocally on the support base plate 61 .

Furthermore, the upper end cover 62 is provided with an escape portion that guides the movement of the clamping detection plate of the detection clamping assembly, and the lower end of the support base plate 61 is provided with a lower support base 63 .

Further, the third detection and clamping assembly 3 has the same structure as the first detection and clamping assembly 1 and includes a third driving rack plate 31, a third transmission gear set, a third clamping detection plate 34, a third The third clamping part 35 and the third driving hydraulic cylinder 38; the third transmission gear set includes a third driving gear, a third guide gear 33, a third input gear 36 and a third transmission wheel 37; the first driving gear set A first clamping portion 15 is provided at one end of the rack plate 11 , and a first clamping detection plate 14 is arranged vertically above the first driving rack plate 11 . The first clamping detection plate 14 and the A clamping portion 15 can contact the first detection position on the circumferential side of the spring to be tested 5; a third drive rack plate 31 is provided with a third drive rack plate 31 at one end thereof close to the first drive rack plate 11. The clamping portion 35 has a third clamping detection plate 34 vertically disposed above the third driving rack plate 31. The third clamping detection plate 34 and the third clamping portion 35 can abut against each other. The second detection position on the circumferential side of the spring to be tested 5; the first detection position and the second detection position are located on opposite sides of the spring to be tested 5, where the first detection position and the second detection position are located. The determined plane passes through the central axis of the spring 5 to be measured.

Furthermore, the lower end surface of the support base plate 61 is also provided with a rotatable first synchronization member 100, and a first rack segment 101 and a second rack segment are disposed at opposite positions on the first synchronization member 100. 102; The first rack segment 101 is meshed with the first transmission wheel 17, and the second rack segment 102 is meshed with the third transmission wheel 37; the first synchronizer 100 makes the third The first clamping detection plate 14 and the third clamping detection plate 34 move towards/back to each other synchronously.

Further, the second detection clamping component 2 and the fourth detection clamping component 4 are arranged oppositely and have the same structure as the first detection clamping component 1 and the third detection clamping component 3; the support substrate The lower end of 61 is also rotatably provided with a second synchronizing member 200. The second synchronizing member 200 is provided with a third rack segment 201 and a fourth rack segment 202 at opposite positions; the third rack The segment 201 meshes with the second speed change wheel 27 of the second detection and clamping assembly 2, and the fourth rack segment 202 meshes with the fourth speed change wheel 47 of the fourth detection and clamping assembly 4;

When the second driving hydraulic cylinder 28 of the second detection and clamping assembly 2 and the fourth driving hydraulic cylinder 48 of the fourth detection and clamping assembly 4 respectively drive the second input gear 26 and the fourth input gear 46 to rotate, the second The synchronizing member 200 realizes the synchronous rotation of the second speed change wheel 27 and the fourth speed change wheel 47, thereby realizing the second clamping detection plate of the second detection and clamping assembly 2 and the fourth clamping detection plate of the fourth detection and clamping assembly 4. Synchronized opposite/opposite movement.

Further, the rotating base 7 includes a rotating base 71, a limiting plate 72, a clamping plate 73, an abutting plate 74 and a clamping spring 75; the rotating base 71 is provided with a plurality of limiting plates 72, A plurality of limiting plates 72 are sleeved on the inner periphery of the spring 5 to be tested; the clamping plate 73 is slidably disposed relative to the limiting plate 72 , and there is a gap between the clamping plate 73 and the abutting plate 74 A clamping spring 75 is provided to provide the clamping plate 73 with a clamping force to move toward the limiting plate 72 .

Further, the rotating base 7 is provided on the lower support base 63, and the rotating base 7 can rotate relative to the supporting base plate 61, thereby changing the position of the detection plate clamped by the detection clamping assembly. The detection position on the spring 5 to be tested.

The rotating base 7 can fixedly support the bottom end of the spring 5 to be tested, and can also rotate relative to the base 6, thereby enabling the first, second, third and fourth detection clamping components to be clamped anywhere around the spring 5 to be tested. position, thereby ensuring multi-point sampling of the spring 5 to be tested and ensuring the accuracy of the flatness detection of the spring.

Further, the light source emitting component 8 includes a light source base 81 and a light curtain emitting component 82, and the light source receiving component 9 includes a connection base and a light curtain receiving component 92; the light source base 81 is provided on the detection clamp. The driving rack plate of the assembly is adjacent to the position where the detection plate is clamped. A vertical light curtain emitting member 82 is provided on the light source base 81. The extension direction of the light curtain emitting member 82 is in line with the clamping detection plate. The clamping surfaces are parallel; the connection base of the light source receiving component 9 is symmetrically arranged with the light source base 81 on both sides of the clamped detection plate, and a light curtain receiving member 92 is provided on the connection base.

Further, the light curtain emitting member 82 emits light toward the contact position between the clamping detection plate and the spring 5 to be measured, and the light curtain receiving member 92 receives the light emitted by the light curtain emitting member 82; the light The distribution of the light received by the curtain receiving member 92 determines the contact between the side surface of the spring 5 to be tested and the clamping detection plate, and then determines the straightness of the spring 5 to be tested.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, and substitutions can be made to these embodiments without departing from the principles and spirit of the invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (9)

1. The utility model provides a spring straightness detection device, includes base (6) and set up in detect clamping assembly on base (6), detect clamping assembly including four first detection clamping assembly (1) that the structure is the same, second detection clamping assembly (2), third detection clamping assembly (3) and fourth detection clamping assembly (4), its characterized in that:

the first detection clamping assemblies (1) and the second detection clamping assemblies (2) are arranged at two ends of the spring (5) to be detected in pairs, and clamp the spring (5) to be detected along a first direction;

the third detection clamping assembly (3) and the fourth detection clamping assembly (4) are arranged at two ends of the spring (5) to be detected in pairs, the spring (5) to be detected is clamped along a second direction, and the first direction is perpendicular to the second direction;

the device comprises a first detection clamping assembly (1), a second detection clamping assembly (2), a third detection clamping assembly (3) and a fourth detection clamping assembly (4), wherein a light source emission assembly (8) and a light source receiving assembly (9) are arranged nearby the first detection clamping assembly, the second detection clamping assembly, the third detection clamping assembly and the fourth detection clamping assembly, the light source emission assembly (8) emits light towards the contact position of the detection clamping assembly and a spring (5) to be detected, the light source receiving assembly (9) receives the light emitted by the light source emission assembly (8), and the flatness of the spring (5) to be detected is detected according to the distribution condition of the received light;

the spring (5) to be tested is clamped and fixed on a rotating seat (7), the rotating seat (7) can rotate relative to the base (6), and the change of the detection position of the spring (5) to be tested is realized through the rotation of the rotating seat (7);

the first detection clamping assembly (1) comprises a first driving rack plate (11), a first transmission gear set, a first clamping detection plate (14), a first clamping part (15) and a first driving hydraulic cylinder (18);

the first transmission gear set comprises a first driving gear (12), a first guiding gear (13), a first input gear (16) and a first speed changing wheel (17);

the base (6) comprises a supporting substrate (61), an upper end cover (62) and a lower supporting seat (63);

the first driving rack plate (11) is slidably arranged on the upper end surface of the supporting substrate (61) through a guide structure, and two sides of the first driving rack plate (11) are respectively meshed with the first driving gear (12) and the first guide gear (13);

the first driving gear (12) and the first speed changing wheel (17) are coaxially arranged and respectively arranged on the upper end face and the lower end face of the supporting substrate (61), and the first input gear (16) is meshed with the first speed changing wheel (17);

the cylinder barrel seat of the first driving hydraulic cylinder (18) is rotatably hinged on the lower end face of the supporting base plate (61), and the tail end of the piston rod of the first driving hydraulic cylinder (18) is connected with the end face of the first input gear (16) through a hinge structure;

the first driving hydraulic cylinder (18) can drive the first input gear (16) to rotate reciprocally by a certain angle, and the first input gear (16) drives the first driving rack plate (11) to move reciprocally on the supporting base plate (61) through rotation of the first speed changing wheel (17) and the first driving gear (12).

2. The spring flatness detection apparatus of claim 1, wherein:

the upper end cover (62) is provided with an avoidance part for guiding the movement of the clamping detection plate of the detection clamping assembly, and the lower end of the support substrate (61) is provided with a lower support seat (63).

3. The spring flatness detection apparatus of claim 2, wherein:

the third detection clamping assembly (3) has the same structure as the first detection clamping assembly (1) and comprises a third driving rack plate (31), a third transmission gear set, a third clamping detection plate (34), a third clamping part (35) and a third driving hydraulic cylinder (38);

the third transmission gear set comprises a third driving gear, a third guiding gear (33), a third input gear (36) and a third speed changing wheel (37);

a first clamping part (15) is arranged at one end of the first driving rack plate (11), a first clamping detection plate (14) is further vertically arranged above the first driving rack plate (11), and the first clamping detection plate (14) and the first clamping part (15) can be abutted to a first detection position on the circumference side of the spring (5) to be detected;

a third clamping part (35) is arranged at one end, close to the first driving rack plate (11), of the third driving rack plate (31), a third clamping detection plate (34) is vertically arranged above the third driving rack plate (31), and the third clamping detection plate (34) and the third clamping part (35) can be abutted to a second detection position on the circumferential side of the spring (5) to be detected;

the first detection position and the second detection position are positioned on two opposite sides of the spring (5) to be detected, and planes determined by the first detection position and the second detection position pass through the central axis of the spring (5) to be detected.

4. A spring flatness detection apparatus according to claim 3, wherein:

the lower end face of the supporting base plate (61) is also provided with a rotatable first synchronous piece (100), and a first rack section (101) and a second rack section (102) are arranged at opposite positions on the first synchronous piece (100);

the first rack section (101) is meshed with the first gear (17), and the second rack section (102) is meshed with the third gear (37);

the first clamping detection plate (14) and the third clamping detection plate (34) are synchronously moved towards/away from each other by the first synchronizing member (100).

5. The spring flatness detection apparatus according to any one of claims 2-4, wherein:

the second detection clamping assembly (2) and the fourth detection clamping assembly (4) are oppositely arranged and have the same structure as the first detection clamping assembly (1) and the third detection clamping assembly (3);

the lower end of the supporting base plate (61) is also rotatably provided with a second synchronizing piece (200), and a third rack section (201) and a fourth rack section (202) are arranged at opposite positions on the second synchronizing piece (200);

the third rack section (201) is meshed with a second speed changing wheel (27) of the second detection clamping assembly (2), and the fourth rack section (202) is meshed with a fourth speed changing wheel (47) of the fourth detection clamping assembly (4);

when the second driving hydraulic cylinder (28) of the second detection clamping assembly (2) and the fourth driving hydraulic cylinder (48) of the fourth detection clamping assembly (4) respectively drive the second input gear (26) and the fourth input gear (46) to rotate, synchronous rotation of the second speed changing wheel (27) and the fourth speed changing wheel (47) is realized through the second synchronizing piece (200), and synchronous opposite/reverse movement of the second clamping detection plate of the second detection clamping assembly (2) and the fourth clamping detection plate of the fourth detection clamping assembly (4) is further realized.

6. The spring flatness detection apparatus of claim 5, wherein:

the rotating seat (7) comprises a rotating base (71), a limiting plate (72), a clamping plate (73), an abutting plate (74) and a clamping spring (75);

a plurality of limiting plates (72) are arranged on the rotating base (71), and the limiting plates (72) are sleeved on the inner periphery of the spring (5) to be tested;

the clamping plate (73) is arranged in a slidable manner relative to the limiting plate (72), a clamping spring (75) is arranged between the clamping plate (73) and the abutting plate (74), and clamping force moving towards the limiting plate (72) is provided for the clamping plate (73) through the clamping spring (75).

7. The spring flatness detection apparatus of claim 6, wherein:

the rotating seat (7) is arranged on the lower supporting seat (63), and the rotating seat (7) can rotate relative to the supporting substrate (61), so that the detection position of the clamping detection plate of the detection clamping assembly on the spring (5) to be detected can be changed.

8. The spring flatness detection apparatus of claim 7, wherein:

the light source emitting assembly (8) comprises a light source base (81) and a light curtain emitting piece (82), and the light source receiving assembly (9) comprises a connecting base and a light curtain receiving piece (92);

the light source base (81) is arranged at a position, close to the clamping detection plate, on the driving rack plate of the detection clamping assembly, a vertical light curtain emitting piece (82) is arranged on the light source base (81), and the extending direction of the light curtain emitting piece (82) is parallel to the clamping surface of the clamping detection plate;

the connecting base of the light source receiving assembly (9) and the light source base (81) are symmetrically arranged on two sides of the clamping detection plate, and the connecting base is provided with a light curtain receiving piece (92).

9. The spring flatness detection apparatus of claim 8, wherein:

the light curtain emitting piece (82) emits light towards the contact position of the clamping detection plate and the spring (5) to be detected, and the light curtain receiving piece (92) receives the light emitted by the light curtain emitting piece (82);

the light curtain receiving piece (92) receives the light distribution condition, the contact condition of the side face of the spring (5) to be detected and the clamping detection plate is determined, and the flatness of the spring (5) to be detected is further judged.