CN218344998U - Lifting clamp and lifting appliance - Google Patents

Abstract

The utility model discloses a hoisting clamp and hoist, wherein, hoisting clamp includes pedestal, the flexible clamping jaw of scissors fork, drive structure and backstop structure, the flexible clamping jaw of scissors fork includes first connecting rod, second connecting rod, third connecting rod and fourth connecting rod, the tip of third connecting rod extends first clamping part downwards, the tip of fourth connecting rod extends second clamping part downwards, the flexible clamping jaw of scissors fork has the clamping state that the extension makes first clamping part be close to with the second clamping part in its flexible stroke to and shorten the pine taking off state that makes first clamping part keep away from with the second clamping part; the driving structure is used for driving the scissor type telescopic clamping jaw to stretch up and down; and when the stopping structure is in the stopping state, the scissor type telescopic clamping jaw is limited to move from the clamping state to the releasing state. The utility model discloses aim at solving current roll holder and can loosen when losing clamping-force and take off, have the problem of potential safety hazard.

Description

Lifting clamp and lifting appliance

Technical Field

The utility model relates to a hoist technical field, concretely relates to stone tongs and hoist.

Background

The roll is comparatively ripe machining tool in present manufacturing industry, according to the difference of processing work piece size and machining strength's difference, the size of roll also has the difference, to small-size roll, self quality is less, the potential safety hazard of existence is little, and large-scale roll quality is big and bulky, need use the hoist to hoist and mount the transportation during manufacturing often, and the stone tongs on the current hoist need provide invariable clamping-force behind the centre gripping roll, if the condition of losing force appears, the stone tongs can appear taking off and take off, lead to the roll to deviate from, there is the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a stone tongs and hoist and utensil aims at solving current roll anchor clamps and can loosen and take off when losing clamping-force, has the problem of potential safety hazard.

In order to achieve the above object, the present invention provides a lifting clamp, wherein the lifting clamp comprises a base body, a scissor-fork type telescopic clamping jaw, a driving structure and a stopping structure, the upper end of the base body is provided with a connecting portion for connecting a cross beam of a lifting appliance, and the lower end of the base body is provided with a hinged seat; the scissor type telescopic clamping jaw comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein the upper ends of the first connecting rod and the second connecting rod are hinged to the hinged seat together, the upper end of the third connecting rod and the upper end of the fourth connecting rod are hinged to the lower end of the first connecting rod and the lower end of the second connecting rod respectively, the lower end of the third connecting rod is hinged to the lower end of the fourth connecting rod, a pin rod axially penetrates through the hinged position of the third connecting rod and the fourth connecting rod, an installation part axially extends out of the pin rod, a connecting rod extending upwards to the base is installed on the installation part, the base is provided with a guide part extending upwards and downwards corresponding to the connecting rod, the connecting rod movably guides the scissor type telescopic clamping jaw to vertically extend and retract up and down along the guide part, the end part of the other end of the third connecting rod extends downwards to form a first clamping part, the end part of the other end of the fourth connecting rod extends downwards to form a second clamping part, and the scissor type telescopic clamping jaw has a clamping state that the first clamping part and the second clamping part extend downwards in the telescopic stroke, and the scissor type clamping jaw is close to be far away from the first clamping part; the driving structure is arranged on the base body and is in driving connection with the scissor type telescopic clamping jaw and used for driving the scissor type telescopic clamping jaw to extend up and down; the stopping structure comprises a stopping part arranged on the guide part and a stopping part arranged on the connecting rod, the stopping part is matched with the stopping state of the stopping part and is separated from the stopping state of the stopping part, and when the stopping part is in the stopping state, the movement of the scissor type telescopic clamping jaw from the clamping state to the loosening state is limited.

Optionally, the guide part is including seting up in through-hole on the pedestal, at least one breach has been seted up to the pore wall of through-hole in order to form backstop portion, the connecting rod is worn to locate the through-hole, just but the mobile income of backstop portion the breach restriction the activity of connecting rod, in order to restrict the flexible clamping jaw activity of scissors fork.

Optionally, an accommodating groove is formed in one side of the connecting rod corresponding to the notch, and the stopping piece is rotatably arranged in the accommodating groove;

the upper end face of the stop part is set to be a stop end face, the lower end face of the stop part is set to be a pushing inclined face, and when the connecting rod moves downwards, the lower side of the notch pushes the pushing inclined face to enable the stop part to be rotatably accommodated in the accommodating groove; when the connecting rod moves upwards, the stop end face abuts against the upper side of the notch to limit the movement of the connecting rod.

Optionally, a position corresponding to the stop piece in the receiving groove is further provided with a reset structure, and the reset structure is used for resetting the stop piece to be received in the receiving groove.

Optionally, the reset structure includes an electromagnetic device, the stop member is configured as a magnetic member, and the electromagnetic device is configured to magnetically attract and drive the stop member to rotate and reset into the accommodating groove, so that the connecting rod can move upward to release the clamping state.

Optionally, the drive structure including install in driving piece on the pedestal and with the drive connecting rod that the driving piece drive is connected, drive connecting rod downwardly extending to connect in the installation department, the driving piece drive the drive connecting rod is movable about the top and bottom in order to drive the installation department is movable about the top and bottom.

Optionally, a mounting groove is formed in the top end of the seat body, the driving piece is embedded into the mounting groove for mounting, an avoiding channel is formed in the bottom end of the seat body, and the driving connecting rod penetrates through the avoiding channel.

Optionally, install two on the pedestal horizontal interval cut the flexible clamping jaw of fork, just the pin rod wears to establish two cut the flexible clamping jaw of fork, the pin rod is located two position between the flexible clamping jaw of fork forms the installation department.

Optionally, a clamping jaw structure is detachably mounted on the first clamping portion and the second clamping portion.

The utility model also provides a lifting appliance, wherein, the lifting appliance comprises a cross beam and at least two lifting clamps, the lifting clamps comprise a seat body, a scissor-fork type telescopic clamping jaw, a driving structure and a stopping structure, the upper end of the seat body is provided with a connecting part for connecting the cross beam of the lifting appliance, and the lower end of the seat body is provided with a hinged seat; the scissor type telescopic clamping jaw comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein the upper ends of the first connecting rod and the second connecting rod are hinged to the hinged seat together, the upper end of the third connecting rod and the upper end of the fourth connecting rod are hinged to the lower end of the first connecting rod and the lower end of the second connecting rod respectively, the lower end of the third connecting rod is hinged to the lower end of the fourth connecting rod, a pin rod axially penetrates through the hinged position of the third connecting rod and the fourth connecting rod, an installation part axially extends out of the pin rod, a connecting rod extending upwards to the base is installed on the installation part, the base is provided with a guide part extending upwards and downwards corresponding to the connecting rod, the connecting rod movably guides the scissor type telescopic clamping jaw to vertically extend and retract up and down along the guide part, the end part of the other end of the third connecting rod extends downwards to form a first clamping part, the end part of the other end of the fourth connecting rod extends downwards to form a second clamping part, and the scissor type telescopic clamping jaw has a clamping state that the first clamping part and the second clamping part extend downwards in the telescopic stroke, and the scissor type clamping jaw is close to be far away from the first clamping part; the driving structure is arranged on the base body and is in driving connection with the scissor type telescopic clamping jaw and used for driving the scissor type telescopic clamping jaw to extend up and down; the stopping structure comprises a stopping part arranged on the guide part and a stopping part arranged on the connecting rod, the stopping part has a stopping state matched with the stopping part and a disengaging state disengaged from the stopping part, and when the stopping part is in the stopping state, the movement of the scissor type telescopic clamping jaw from the clamping state to the releasing state is limited; the hoisting clamps can be transversely movably arranged on the cross beam, so that the distance between at least two hoisting clamps can be adjusted.

The technical scheme of the utility model in, adopt cut flexible clamping jaw of fork as fixture, it is comparatively stable at the operation in-process, and stability is strong so that the security is strong. Specifically, first connecting rod the second connecting rod the third connecting rod with the fourth connecting rod is constituteed cut the four-bar linkage structure of flexible clamping jaw of fork, just the third connecting rod with the lower extreme of fourth connecting rod passes through the pin rod is articulated, be provided with on the pin rod the installation department set up on the installation department the connecting rod, the connecting rod upwards extends to the pedestal, and receives on the pedestal guide portion guide, so that cut the flexible clamping jaw of fork and only stretch out and draw back along vertical direction, thereby avoid cut the flexible clamping jaw of fork and wind articulated seat swing promotes its stability. On this basis, be provided with backstop structure, through backstop portion backstop on the guide part backstop on the connecting rod is with the backstop the connecting rod activity, and then backstop the activity of scissors fork type telescopic clamping jaw, thereby make when drive structure stops the drive, promptly when not exerting the clamp force to scissors fork type telescopic clamping jaw, backstop structure can restrict scissors fork type telescopic clamping jaw certainly the clamping status to the activity of pine off-state, avoid stone tongs losing clamping force Shi Song takes off, has promoted stone tongs's security performance.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic perspective view of an embodiment of a lifting clamp provided by the present invention;

FIG. 2 is a cross-sectional view of the stone tongs of FIG. 1;

FIG. 3 is a schematic partial cross-sectional view of the stopper of FIG. 2 in a stopping condition;

fig. 4 is a partial cross-sectional schematic view of the stopper of fig. 2 in a disengaged state.

The reference numbers indicate:

the realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The roll is comparatively ripe machining tool in present manufacturing industry, according to the difference of processing work piece size and machining strength's difference, the size of roll also has the difference, to small-size roll, self quality is less, the potential safety hazard of existence is little, and large-scale roll quality is big and bulky, need use the hoist to hoist and mount when manufacturing and transport often, and the stone tongs on the current hoist need provide invariable clamping-force behind the centre gripping roll, if the condition of losing power appears, the stone tongs can appear taking off and take off, lead to the roll to deviate from, there is the potential safety hazard.

In view of this, the present invention provides a lifting clamp, fig. 1 to 4 are embodiments of the lifting clamp provided by the present invention, which will be described below with reference to the accompanying drawings.

Referring to fig. 1 to 4, the lifting clamp 100 includes a base body 1, a scissor-type retractable jaw 2, a driving structure, and a stopping structure. The upper end of the seat body 1 is provided with a connecting part 11 for connecting a cross beam of a lifting appliance, and the lower end is provided with a hinged seat 12; the scissor type telescopic clamping jaw 2 comprises a first connecting rod 21, a second connecting rod 22, a third connecting rod 23 and a fourth connecting rod 24, the upper ends of the first connecting rod 21 and the second connecting rod 22 are hinged to the hinged seat 12, the upper end of the third connecting rod 23 and the upper end of the fourth connecting rod 24 are hinged to the lower end of the first connecting rod 21 and the lower end of the second connecting rod 22 respectively, the lower end of the third connecting rod 23 is hinged to the lower end of the fourth connecting rod 24, a pin rod 25 axially penetrates through the hinged position of the third connecting rod 23 and the fourth connecting rod 24, an installation part 26 axially extends out of the pin rod 25, and a connecting rod 27 which upwards extends to the seat body 1 is installed on the installation part 26, the base body 1 is provided with a guide part 13 extending up and down corresponding to the connecting rod 27, the connecting rod 27 movably guides the scissor-type telescopic clamping jaw 2 to vertically extend and retract up and down along the guide part 13, the end part of the other end of the third connecting rod 23 extends downwards to form a first clamping part 231, the end part of the other end of the fourth connecting rod 24 extends downwards to form a second clamping part 241, and the scissor-type telescopic clamping jaw 2 has a clamping state of extending in the extending and retracting stroke to enable the first clamping part 231 to be close to the second clamping part 241 and a loosening state of shortening to enable the first clamping part 231 to be far away from the second clamping part 241; the driving structure is arranged on the base body 1, is in driving connection with the scissor type telescopic clamping jaw 2 and is used for driving the scissor type telescopic clamping jaw 2 to extend up and down; the stopping structure comprises a stopping part 131 arranged on the guide part 13 and a stopping part 271 arranged on the connecting rod 27, the stopping part 271 has a stopping state matched with the stopping part 131 and a disengaging state disengaged from the stopping part 131, and when the stopping part 271 is in the stopping state, the movement of the scissor type telescopic clamping jaw 2 from the clamping state to the disengaging state is limited.

The technical scheme of the utility model in, adopt cut flexible clamping jaw 2 of fork as fixture, it is comparatively stable at the operation in-process, and stability is strong so that the security is strong. Specifically, first connecting rod 21 the second connecting rod 22 the third connecting rod 23 with fourth connecting rod 24 constitutes the four-bar linkage of the flexible clamping jaw of scissors fork 2, just the third connecting rod 23 with the lower extreme of fourth connecting rod 24 passes through pin 25 articulates, be provided with on the pin 25 the installation department 26 set up on the installation department 26 connecting rod 27, connecting rod 27 upwards extends to pedestal 1, and receives on the pedestal 1 guide portion 13 guides, so that the flexible clamping jaw of scissors fork 2 only stretches out and draws back along vertical direction, thereby avoids the flexible clamping jaw of scissors fork 2 winds the swing of articulated seat 12 promotes its stability. On this basis, the stopping structure is provided, and the stopping part 271 on the connecting rod 27 is stopped by the stopping part 131 on the guiding part 13 to stop the movement of the connecting rod 27, and further stop the movement of the scissor-type telescopic clamping jaw 2, so that when the driving structure stops driving, that is, when a clamping force is not applied to the scissor-type telescopic clamping jaw 2, the stopping structure can limit the movement of the scissor-type telescopic clamping jaw 2 from the clamping state to the release state, the lifting clamp 100 is prevented from being released when the clamping force Shi Song is lost, and the safety performance of the lifting clamp 100 is improved.

Specifically, the guiding portion 13 includes a through hole 13a opened on the base body 1, the hole wall of the through hole 13a is opened with at least one notch 131a to form the stopping portion 131, the connecting rod 27 is inserted into the through hole 13a, and the stopping member 271 can movably extend into the notch 131a to limit the movement of the connecting rod 27, so as to limit the movement of the scissor-type telescopic jaw 2. The guiding portion 13 may be a guide rail disposed on the base 1, and the connecting rod 27 is provided with a sliding portion engaged with the guide rail, so that the sliding portion slides along the guide rail to drive the connecting rod 27 to move up and down; the guide portion 13 may be provided with other structures, and the guide portion 13 only needs to be capable of guiding the connecting rod 27 to move in the vertical direction, which is not limited herein. In this embodiment, the guiding portion 13 is the through hole 13a, the connecting rod 27 extends into the through hole 13a, so that the guiding portion 13 guides the connecting rod 27 to move up and down, the structure is simple, and the setting cost is low. On the basis, the notch 131a is arranged in the through hole 13a as the stopper 131, the stopper 271 is movably arranged on the connecting rod 27, and the stopper 271 has a disengagement state that the stopper 271 retracts to the connecting rod 27 to disengage from the stopper 131 and a stop state that the stopper extends out of the connecting rod 27 to cooperate with the notch 131a to stop the connecting rod 27 from moving downwards, so that the connecting rod 27 can move and stop in the through hole 13 a.

Further, an accommodating groove 272 is formed in one side of the connecting rod 27 corresponding to the notch 131a, and the stopper 271 is rotatably disposed in the accommodating groove 272; the upper end surface of the stopper 271 is set as a stopper end surface 271a, and the lower end surface is set as a pushing inclined surface 271b, when the connecting rod 27 moves downward, the lower side of the notch 131a pushes the pushing inclined surface 271b, so that the stopper 271 is rotatably accommodated in the accommodating groove 272; when the connecting rod 27 moves upward, the stopping end surface 271a abuts against the upper side of the notch 131a to limit the movement of the connecting rod 27. The stop part 271 can be set as a pin rod 25 controlled by a driving mechanism, so that the pin rod 25 has a certain telescopic stroke to realize switching between the two states, but the pin rod 25 is set to be easily deformed by radial force for a long time, so that the telescopic action is blocked to influence the up-and-down movement of the connecting rod 27, and further influence the normal operation of the scissor-type telescopic clamping jaw 2. Therefore, in this embodiment, the accommodating groove 272 is formed on one side of the connecting rod 27 corresponding to the notch 131a, the stopper 271 is rotatably disposed in the accommodating groove 272, so that the stopper 271 can rotatably extend out of the end surface of the connecting rod 27 and abut against the notch 131a to complete stopping of the connecting rod 27, and the stopper 271 can also rotatably retract into the accommodating groove 272, so that the connecting rod 27 can move up and down along the through hole 13 a. With such an arrangement, when the rotation connection portion between the stopper 271 and the receiving groove 272 is deformed by pressure, the stopper 271 can still rotate, so that the connecting rod 27 cannot be taken out from the through hole 13a due to complete locking is avoided, and the pin connection is more reliable than the pin connection by the pin rod 25.

Specifically, the upper end surface of the stopper 271 is set as the stopper end surface 271a, when the stopper 271 rotates and extends out of the connecting rod 27, the stopper end surface 271a can abut against the top of the notch 131a, so as to limit the connecting rod 27 to move upwards, and further limit the scissor-type telescopic clamping jaw 2 to retract to the release state. The lower end surface of the stopper 271 is set as the pushing inclined surface 271b, when the scissor-type telescopic clamping jaw 2 extends to clamp, the connecting rod 27 moves downward, at this time, the pushing inclined surface 271b abuts against the bottom of the notch 131a, and the bottom of the notch 131a pushes the stopper 271 to rotate along the pushing inclined surface 271b so as to retract to the connecting rod 27, so that the stopper 271 is prevented from influencing the clamping action of the scissor-type telescopic clamping jaw 2.

It should be noted that, when the stopper 271 provided in this embodiment is in a static state, the stopper 271 is always in a state of extending out of the connecting rod 27 under the influence of its own gravity, so as to achieve an automatic locking function after the stopper 271 slides into the notch 131 a.

Further, a reset structure 273 is further disposed in the receiving groove 272 at a position corresponding to the stopper 271, and the reset structure 273 is used for resetting the stopper 271 to be received in the receiving groove 272. When the roll is lifted and unloaded, the scissor type telescopic clamping jaw 2 needs to be taken down, at the moment, the stop part 271 is in the stop state, namely, the stop end surface 271a abuts against the top of the notch 131a, the unlocking can be carried out manually, an unlocking tool can be used for stretching into the through hole 13a to abut against and push the inclined plane 271b of the stop part 271, so that the stop part 271 is pushed to retract into the accommodating groove 272, the unlocking of the stop part 271 is never completed, at the moment, the connecting rod 27 can move upwards along the through hole 13a, so that the scissor type telescopic clamping jaw 2 can be normally driven to retract and disengage from the roll, and the lifting and transferring work is completed. However, such an arrangement is obviously troublesome, so the reset structure 273 is provided in this embodiment to automatically unlock the stopper 271, which is convenient for operation.

Specifically, the reset structure 273 includes an electromagnetic device, the stopper 271 is a magnetic member, and the electromagnetic device is used for magnetically driving the stopper 271 to rotate and reset into the receiving groove 272, so that the connecting rod 27 can move upward to release the clamping state. The reset structure 273 can be set as a motion structure in the accommodating groove 272, and the stop member 271 is driven to rotate through the motion of the structure, so that the stop member 271 is retracted into the accommodating groove 272 to unlock the stop member 271, but this way needs to be set in the accommodating groove 272, which is difficult in design and high in cost. Therefore, in this embodiment, the reset structure 273 is configured as the electromagnetic device, and the stopper 271 is driven by magnetic force to rotate so as to retract into the accommodating groove 272, so that the limitation of the spatial structure is small, the design is easy, and the cost is low.

In addition, the driving structure includes a driving part 14 installed on the seat body 1 and a driving connecting rod 15 in driving connection with the driving part 14, the driving connecting rod 15 extends downwards to be connected to the installation part 26, and the driving part 14 drives the driving connecting rod 15 to move up and down to drive the installation part 26 to move up and down. The driving part 14 is arranged on the seat body 1, so that the structure is simple, the installation is convenient, and the maintenance of the driving part 14 is convenient.

Specifically, a mounting groove 16 is formed in the top end of the seat body 1, the driving member 14 is embedded into the mounting groove 16 for mounting, an avoidance channel is formed in the bottom end of the seat body 1, and the driving connecting rod 15 penetrates through the avoidance channel. Through setting up dodge the passageway, can restrict drive connecting rod 15 is ascending activity radially, ensures the stability of driving from top to bottom on the one hand, on the other hand when drive connecting rod 15 receives great radial force, can support in drive connecting rod 15 is in order to play certain guard action to drive connecting rod 15.

In addition, horizontal interval installs two on the pedestal 1 cut the flexible clamping jaw of fork 2, just two is worn to establish by pin rod 25 cut the flexible clamping jaw of fork 2, pin rod 25 is located two the position between the flexible clamping jaw of fork 2 forms installation department 26. It will be appreciated that two scissor-type telescopic jaws 2 are provided to form a lifting clamp 100 which is more stable in grip. Simultaneously, two are worn to locate by pin rod 25 the telescopic clamping jaw of scissor fork 2, its middle part forms installation department 26, so that pin rod 25's both ends receive the support, and are more stable.

In addition, a clamping jaw structure 28 is detachably mounted on the first clamping portion 231 and the second clamping portion 241. The roll is nipped by directly using the first nip portion 231 and the second nip portion 241, and when the first nip portion 231 and the second nip portion 241 are damaged, it is difficult and costly to replace them, and the shape and material of the structure contacting the roll cannot be adjusted by directly using the first nip portion 231 and the second nip portion 241, which is poor in versatility. Therefore, in this embodiment, fixing holes are formed in the first clamping portion 231 and the second clamping portion 241 for detachably fixing the clamping jaw structure 28, the specific material and shape of the clamping jaw structure 28 can be freely set according to requirements, the universality is high, the first clamping portion 231 and the second clamping portion 241 do not need to be replaced frequently, and the cost is low.

The utility model discloses still provide a hoist, the hoist includes crossbeam and two at least stone tongs 100, stone tongs 100's concrete structure refers to above-mentioned embodiment. Since the lifting appliance adopts all technical schemes of all the embodiments, at least all the beneficial effects brought by the technical schemes of the embodiments are achieved, and the detailed description is omitted. And, the lifting clamps 100 can be transversely movably arranged on the beam, so that the distance between at least two lifting clamps 100 can be adjusted.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the patent scope of the utility model, all be in the utility model discloses a under the design, utilize the equivalent structure transform of what the content of the description and the attached drawing was done, or direct/indirect application all includes in other relevant technical field the utility model discloses a patent protection is within range.

Claims (10)

1. A stone tongs, characterized by comprising:

the upper end of the base body is provided with a connecting part for connecting a cross beam of the lifting appliance, and the lower end of the base body is provided with a hinge base;

the scissor type telescopic clamping jaw comprises a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod, wherein the upper ends of the first connecting rod and the second connecting rod are hinged to the hinged seat together, the upper end of the third connecting rod and the upper end of the fourth connecting rod are hinged to the lower end of the first connecting rod and the lower end of the second connecting rod respectively, the lower end of the third connecting rod is hinged to the lower end of the fourth connecting rod, a pin rod axially penetrates through the hinged position of the third connecting rod and the fourth connecting rod, an installation part axially extends out of the pin rod, a connecting rod extending upwards to the base is installed on the installation part, a guide part extending upwards and downwards is arranged on the base corresponding to the connecting rod, the connecting rod movably guides the scissor type telescopic clamping jaw to vertically extend and retract up and down along the guide part, the end part of the other end of the third connecting rod extends downwards to form a first clamping part, the end part of the other end of the fourth connecting rod extends downwards to form a second clamping part, and the scissor type telescopic clamping jaw has a clamping state that the first clamping part and the second clamping part extend and the second clamping part is close to the second clamping part and is far away from the second clamping part in the telescopic clamping jaw in the telescopic stroke;

the driving structure is arranged on the base body, is in driving connection with the scissor type telescopic clamping jaw and is used for driving the scissor type telescopic clamping jaw to extend up and down; and the number of the first and second groups,

the stopping structure comprises a stopping part arranged on the guide part and a stopping part arranged on the connecting rod, the stopping part is matched with the stopping state of the stopping part and is separated from the separating state of the stopping part, and when the stopping part is in the stopping state, the movement of the scissor type telescopic clamping jaw from the clamping state to the releasing state is limited.

2. The stone tongs of claim 1, wherein the guiding portion comprises a through hole formed in the base, the through hole has a hole wall formed with at least one notch to form the stopping portion, the connecting rod is inserted into the through hole, and the stopping portion can movably extend into the notch to limit the movement of the connecting rod, so as to limit the movement of the scissor-type telescopic clamping jaw.

3. The stone tongs as claimed in claim 2, wherein the connecting rod has a receiving groove formed on a side thereof corresponding to the notch, the receiving groove being rotatably provided with the stopper;

the upper end face of the stop piece is set to be a stop end face, the lower end face of the stop piece is set to be a pushing inclined face, and when the connecting rod moves downwards, the lower side of the notch pushes the pushing inclined face, so that the stop piece is rotatably accommodated in the accommodating groove; when the connecting rod moves upwards, the stop end face abuts against the upper side of the notch to limit the movement of the connecting rod.

4. A lifting clamp as recited in claim 3, wherein a reset feature is provided in the receiving groove at a location corresponding to the stop member, the reset feature being configured to reset the stop member to be received in the receiving groove.

5. The stone tongs as claimed in claim 4, wherein the reset structure comprises an electromagnetic device, the stop member is configured as a magnetic member, and the electromagnetic device is configured to magnetically drive the stop member to rotate and reset into the receiving groove, so that the connecting rod can move upward to release the clamping state.

6. A hoist clamp as recited in claim 1, wherein the drive structure includes a drive member mounted on the base and a drive link drivingly connected to the drive member, the drive link extending downwardly to connect to the mounting portion, the drive member driving the drive link to move up and down to drive the mounting portion to move up and down.

7. The stone tongs as claimed in claim 6, wherein the top end of the base body is provided with a mounting groove, the driving member is embedded in the mounting groove, the bottom end of the base body is provided with an avoiding channel, and the driving link rod is inserted through the avoiding channel.

8. A lifting clamp as recited in claim 1, wherein the base has two scissor-type retractable jaws mounted thereon at spaced intervals in a lateral direction, and the pin rod penetrates the two scissor-type retractable jaws, and a portion of the pin rod located between the two scissor-type retractable jaws forms the mounting portion.

9. A hoist clamp as claimed in claim 1, characterised in that the first clamping portion and the second clamping portion have jaw formations removably mounted thereon.

10. A spreader, comprising:

a cross beam; and the number of the first and second groups,

at least two of the ring tongs according to any one of claims 1 to 9, the ring tongs being laterally moveably arranged to the beam such that the distance between the at least two ring tongs is adjustably set.

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