An automatic centering clamp for hand locks

Abstract

This invention relates to the field of precision clamping technology, specifically disclosing a compact, precise, low-failure-rate, and long-service-life automatic centering clamp with a hand lock. The clamp includes a main body shell with a cavity and an adjustment hole, a curved body within the cavity that can swing in a vertical plane, a pulling assembly, a drive component inserted into the adjustment hole to push the curved body to swing, an elastic chuck fixedly connected to the top of the main body shell and having a product clamping area on its top, and an inner conical sleeve fitted onto the elastic chuck. The pulling assembly includes a pull core and a pull core pin located within the cavity, a pair of connecting rods opposite each other outside the cavity, and an elastic element located at the bottom of the pull core. The pull core pin penetrates the side wall of the main body shell and connects to the pull core for synchronous lifting and lowering. Each end of the pull core pin is connected to a connecting rod that limits the movement of the inner conical sleeve. When the drive component leaves or pushes the curved body, the pull core rises under the action of the elastic element or falls under the drive of the curved body. The pull core pin drives the connecting rods and the inner conical sleeve to rise and fall, squeezing or releasing the elastic chuck to clamp or release the product.

Description

Technical Field

[0001] This invention relates to the field of precision clamping technology, and in particular to a hand-locked automatic centering clamp that achieves high-precision positioning of precision parts by manually tightening bolts. Background Technology

[0002] In machining processes, fixtures are often used to clamp and position precision parts to ensure the accuracy and reliability of the machining. Due to the requirements of controlling machining costs and efficiency, the structure of the fixtures should be simplified, and their failure rate should be kept low to avoid frequent fixture damage and downtime for replacement, which would negatively impact machining costs and efficiency. Currently, the fixtures used in the industry mainly include hand-locking fixtures and pneumatic fixtures. Hand-locking fixtures are susceptible to operator error, and the positioning part is prone to misalignment, resulting in poor centering accuracy and inaccurate workpiece positioning, thus increasing the defect rate. Pneumatic fixtures use cylinders to provide the power for workpiece clamping and positioning. However, because cylinders occupy a large space and the overall structure of the fixture becomes complex after installation, the failure rate increases, affecting machining efficiency. Summary of the Invention

[0003] Therefore, it is necessary to provide an automatic centering fixture for hand locks that is compact, has precise positioning, low failure rate, and long service life, in order to address the above-mentioned shortcomings.

[0004] An automatic centering clamp for hand locks, comprising:

[0005] The main body shell has a cavity inside, and the side of the main body shell has an adjustment hole communicating with the cavity;

[0006] A curved body, which is housed within a cavity and can swing in a vertical plane;

[0007] A pulling assembly includes a core and a core pin housed within a cavity, a pair of connecting rods located on the outside of the main body housing and arranged opposite to each other, and an elastic element fixed to the bottom of the core. The core pin passes through two opposite side walls of the main body housing and is connected to the core to move up and down synchronously with the core. Each end of the core pin is connected to one of the connecting rods.

[0008] A drive unit is telescopically inserted into the adjustment hole to push the bottom of the bend to swing the bend, and the top of the bend presses against the pull core when the bend swings, so that the elastic element at the bottom of the pull core abuts against the drive unit;

[0009] The elastic chuck is located on the outside of the main body shell and is fixedly connected to the top of the main body shell. The top of the elastic chuck is provided with an adjustable product clamping area.

[0010] An inner conical sleeve is fitted onto an elastic clamp and connected to two connecting rods. The inner surface shape of the inner conical sleeve is adapted to the outer surface shape of the elastic clamp.

[0011] When the drive unit pushes the bending body, the pull core is squeezed and descends by the bending body. The pull core pin drives the connecting rod to descend, causing the inner conical sleeve to descend relative to the elastic chuck, thereby adjusting the size of the product clamping area and clamping or releasing the product clamped in the product clamping area. When the drive unit leaves the bending body, the bending body swings back. The pull core is pushed by the elastic element, causing the pull core pin and connecting rod to rise, causing the inner conical sleeve to rise relative to the elastic chuck, thereby adjusting the size of the product clamping area and clamping or releasing the product clamped in the product clamping area.

[0012] In one embodiment, the weight from the bottom of the bend to the center of the bend's swing is greater than the weight from the top of the bend to the center of the bend's swing, and the distance from the center of the bend's swing to the bottom segment is greater than or equal to the distance from the center of the bend's swing to the top segment.

[0013] In one embodiment, the bent body has a C-shaped structure with an opening facing the core, and the core is located on the inside of the bent body and below the top of the bent body.

[0014] In one embodiment, the automatic centering clamp for the hand lock further includes a bending body fixing pin, which passes through two opposite sidewalls of the main body housing and connects to the bending body to define the swing center of the bending body.

[0015] In one embodiment, the bending body fixing pin is fixedly connected to the bending body, and the two opposite side walls of the main body shell are provided with insertion holes for rotatably inserting the bending body fixing pin. The two ends of the bending body fixing pin are fitted with first buckles that abut against the outer surface of the main body shell.

[0016] In one embodiment, the bent body fixing pin is fixedly connected to two opposite side walls of the main body shell, and the bent body is rotatably sleeved on the bent body fixing pin.

[0017] In one embodiment, guide holes are provided on two opposite sidewalls of the main body shell. The pull pin passes through the guide holes and can move up and down vertically within the guide holes. The two ends of the pull pin are provided with second buckles that abut against the outer side of the connecting rod. The driving component is a driving bolt, and the adjusting hole is a threaded hole that is threaded to the driving bolt. The elastic component is a spring.

[0018] In one embodiment, a through groove communicating with the cavity is provided on the side of the main body shell facing away from the adjustment hole, and a cover plate is installed at the opening of the through groove.

[0019] In one embodiment, the top of the main body shell is provided with a threaded post, the bottom of the elastic clamp is sleeved on the threaded post and threadedly connected to the threaded post, and at least two elastic limiting members are distributed in a ring on the upper part of the elastic clamp, and each of the elastic limiting members together forms the product clamping area for clamping the product.

[0020] In one embodiment, the automatic centering clamp for hand locks also includes a base, the upper surface of which has a boss in the middle, and the bottom of the main body shell has a through hole communicating with the cavity. The main body shell is fitted onto the boss through the through hole and bolted to the base.

[0021] The automatic centering fixture with hand lock of the present invention has a pulling component for lifting the inner conical sleeve located inside the cavity of the main body shell, while the elastic chuck is fixed to the top of the main body shell, reducing the overall space occupied by the fixture and making its structure more compact. The size of the product clamping area can be adjusted by simply adjusting the depth of the driving component inserted into the adjustment hole to clamp or release the product in the product clamping area. Its operation is simple, the centering accuracy of the fixture is high, the positioning reliability is good, and the processing accuracy of the product is guaranteed. Each moving part is housed in the cavity of the main body shell. When adjusting the fixture, only the driving component needs to be moved, resulting in high operation accuracy. The parts inside the cavity are not easily damaged, reducing the failure rate of the fixture, which helps to extend the service life of the fixture and ensure product processing efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the automatic centering clamp for hand locks in one embodiment of the present invention;

[0023] Figure 2 This is an exploded view of the automatic centering clamp for hand locks in one embodiment of the present invention.

[0024] Figure 3 This is an exploded view of the automatic centering clamp for hand locks in one embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the structure of the drive component and the pulling component in one state according to an embodiment of the present invention;

[0026] Figure 5 for Figure 4 The side view of the embodiment shown, where the drive component and the pull assembly are engaged;

[0027] Figure 6 This is a side view of another state when the drive member and the pulling assembly are engaged in one embodiment of the present invention. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] This invention addresses the problems of poor centering accuracy in handlock clamps and the large space occupation, complex structure, and high failure rate of pneumatic clamps. It provides a compact, precise, low-failure-rate, and long-life automatic centering clamp for handlocks. The pulling component for raising and lowering the inner conical sleeve is housed within the cavity of the main body shell, while the elastic chuck is fixed to the top of the main body shell, reducing the overall space occupied by the clamp and resulting in a more compact structure. The size of the product clamping area can be adjusted simply by changing the depth of the drive component inserted into the adjustment hole, thus clamping or releasing the product within the clamping area. The operation is simple, the clamp has high centering accuracy and good positioning reliability, ensuring the processing accuracy of the product. Since all moving parts are housed within the cavity of the main body shell, only the drive component needs to be activated during clamping, resulting in high operational accuracy. The components within the cavity are less prone to damage, reducing the clamp's failure rate, extending its service life, and ensuring product processing efficiency.

[0030] Please combine Figure 1 and Figure 2 The automatic centering clamp 10 of this embodiment includes a main body shell 100, a curved body 200, a pulling component 300, a driving component 400, an elastic chuck 500, and an inner conical sleeve 600. The main body shell 100 is used to house the curved body 200 and the pulling component 300, and provides a mounting part for the driving component 400 and the elastic chuck 500. The driving component 400 serves as a trigger for the movement of the curved body 200 and an operating part for the operator. The pulling component 300 is used to move up and down under the drive of the curved body 200 to adjust the position of the inner conical sleeve 600. The movement of the inner conical sleeve 600 adjusts the squeezing force of the inner conical sleeve 600 on the elastic chuck 500, thereby clamping or releasing the product and realizing the self-centering clamping of the product. The inner surface of the inner conical sleeve 600 is a conical surface. The shape of the inner surface of the inner conical sleeve 600 is adapted to the shape of the outer surface of the elastic chuck 500 so as to ensure that the horizontal distance between the inner conical sleeve 600 and the elastic chuck 500 changes when the inner conical sleeve 600 moves up and down relative to the elastic chuck 500, so as to adjust the squeezing force of the inner conical sleeve 600 on the elastic chuck 500.

[0031] For specific details, please refer to... Figure 1-3In this embodiment, the main body shell 100 is provided with a cavity 110, which is used to provide a trigger working area for the pulling assembly 300. The side of the main body shell 100 is provided with an adjustment hole 120 communicating with the cavity 110. The adjustment hole 120 provides a channel for relative movement between the drive member 400 and the curved body 200. The curved body 200 is housed in the cavity 110 and can swing in a vertical plane. The pulling assembly 300 includes a pull core 310 and a pull core pin 320 housed in the cavity 110, a pair of connecting rods 330 located on the outside of the main body shell 100 and arranged opposite to each other, and an elastic member 340 fixed to the bottom of the pull core 310. The pull core pin 320 passes through the two opposite side walls of the main body shell 100 and is connected to the pull core 310 to move up and down synchronously with the pull core 310. Each end of the pull core pin 320 is connected to a connecting rod 330. The drive member 400 is retractably inserted into the adjustment hole 120 to push the bottom of the bent body 200, causing the bent body 200 to swing. The top of the bent body 200 presses against the pull core 310 during swinging, so that the elastic element 340 at the bottom of the pull core 310 abuts against the drive member 400. The elastic chuck 500 is located outside the main housing 100 and is fixedly connected to the top of the main housing 100. The top of the elastic chuck 500 has an adjustable product clamping area 510. The inner conical sleeve 600 is fitted onto the elastic chuck 500 and connected to two connecting rods 330, used to press or release the elastic chuck 500 under the traction of the connecting rods 330. (Please refer to further details.) Figure 3-6 When the drive member 400 pushes the bending body 200, the pull core 310 is squeezed and lowered by the bending body 200. The pull core pin 320 drives the connecting rod 330 to lower and lower the inner conical sleeve 600 relative to the elastic chuck 500, so as to adjust the size of the product clamping area 510 and clamp or release the product clamped in the product clamping area 510. When the drive member 400 leaves the bending body 200, the bending body 200 swings back. The pull core 310 is pushed by the elastic member 340 and drives the pull core pin 320 and the connecting rod 330 to rise, so that the inner conical sleeve 600 rises relative to the elastic chuck 500, so as to adjust the size of the product clamping area 510 and release or clamp the product clamped in the product clamping area 510.

[0032] In this embodiment, the movement of the bending body 200 is achieved by the driving member 400 and the elastic member 340. Specifically, when the driving member 400 is inserted into the adjustment hole 120 to abut and push the bottom of the bending body 200, the bending body 200 swings in the vertical plane under the push of the driving member 400. In this case, the bottom of the bending body 200 swings upward and the top of the bending body 200 swings downward. As a result, the core 310 will descend under the squeezing action of the top of the bending body 200, and simultaneously drive the elastic member 340 to descend, so that the bottom of the elastic member 340 abuts against the upper surface of the driving member 400 and generates elastic deformation. As the core puller 310 descends, the core puller pin 320 descends simultaneously, pulling the connecting rod 330 downwards. This causes the connecting rod 330 to lower the inner conical sleeve 600. Since the inner surface of the inner conical sleeve 600 is conical, the distance between the inner conical sleeve 600 and the outer surface of the elastic chuck 500 changes during the descent, thereby clamping or releasing the elastic chuck 500. In this embodiment, when the inner conical sleeve 600 descends, the compressive force of the inner conical sleeve 600 on the elastic chuck 500 increases, and the space enclosed by the product clamping area 510 decreases, thus clamping the product. When it is necessary to remove the product, simply move the drive member 400 in the reverse direction to move it away from the bottom of the bend 200 and release the drive member 400 from the elastic member 340. In this case, the elastic member 340 resets and drives the pull core 310 to rise, so that the pull core pin 320, the connecting rod 330 and the inner conical sleeve 600 rise synchronously. The squeezing force of the inner conical sleeve 600 on the elastic clamp 500 is reduced, thereby releasing the product.

[0033] It should be noted that in other embodiments, the weight from the bottom of the curved body 200 to the swing center of the curved body 200 is greater than the weight from the top of the curved body 200 to the swing center of the curved body 200, and the distance from the swing center of the curved body 200 to the bottom section of the curved body 200 is greater than or equal to the distance from the swing center of the curved body 200 to the top section of the curved body 200. In other words, the section from the swing center of the curved body 200 to the bottom section of the curved body 200 is a counterweight section. Thus, when the driving member 400 leaves the bottom of the curved body 200, the bottom of the curved body 200 will swing back under its own weight, thereby causing the top of the curved body 200 to leave the top of the pull core 310, relieving the compression of the curved body 200 on the pull core 310, so that the elastic member 340 can restore its elastic deformation and drive the pull core 310, the pull core pin 320 and the connecting rod 330 to rise.

[0034] In addition, in this embodiment, the inner width or inner diameter of the top of the inner conical sleeve 600 is smaller than the inner width or inner diameter of the bottom of the inner conical sleeve 600, that is, it has a positively oriented conical hole structure, and the outer surface of the elastic chuck 500 has a positively oriented conical structure. Thus, when the inner conical sleeve 600 is lowered by the traction of the connecting rod 330, the gap between the inner conical sleeve 600 and the elastic chuck 500 decreases, the squeezing force of the inner conical sleeve 600 on the elastic chuck 500 increases, and the upper part of the elastic chuck 500 converges, making the product clamping area 510 smaller to clamp the product; when the inner conical sleeve 600 is raised by the traction of the connecting rod 330, the gap between the inner conical sleeve 600 and the elastic chuck 500 increases, the squeezing force of the inner conical sleeve 600 on the elastic chuck 500 decreases, and the upper part of the elastic chuck 500 opens, making the product clamping area 510 larger to release the product. In another embodiment, the inner width or inner diameter of the top of the inner conical sleeve 600 is greater than the inner width or inner diameter of the bottom of the inner conical sleeve 600, i.e., it has an inverted conical hole structure. The outer surface of the elastic chuck 500 has an inverted conical structure. Thus, when the inner conical sleeve 600 is lowered by the traction of the connecting rod 330, the gap between the inner conical sleeve 600 and the elastic chuck 500 increases, the squeezing force of the inner conical sleeve 600 on the elastic chuck 500 decreases, and the upper part of the elastic chuck 500 opens, making the product clamping area 510 larger to release the product. When the inner conical sleeve 600 is raised by the traction of the connecting rod 330, the gap between the inner conical sleeve 600 and the elastic chuck 500 decreases, the squeezing force of the inner conical sleeve 600 on the elastic chuck 500 increases, and the upper part of the elastic chuck 500 converges, making the product clamping area 510 smaller to clamp the product.

[0035] In this embodiment, the automatic centering clamp 10 of the hand lock also includes a base 700. A boss 710 is provided in the middle of the upper surface of the base 700. A through hole 130 communicating with the cavity 110 is provided at the bottom of the main body shell 100. The main body shell 100 is sleeved on the boss 710 through the through hole 130 and bolted to the base 700. Furthermore, the bottom edge of the main body shell 100 protrudes away from the cavity 110 to form a mounting part 140. The mounting part 140 has a square structure, and first screw holes 150 are respectively provided at the four corners of the mounting part 140. Similarly, four second screw holes 720 are provided on the base 700, corresponding to each of the first screw holes 150. By bolts 730 passing through the first screw holes 150 and the second screw holes 720 respectively, the main body shell 100 and the base 700 are fixedly connected to each other, so as to raise the height of the bottom of the main body shell 100 and prevent impurities or water from entering the cavity 110, thereby causing the internal parts of the cavity 110 to rust or the pulling component 300 to have difficulty moving due to the accumulation of dirt.

[0036] In one embodiment, the main body shell 100 has a through groove 160 communicating with the cavity 110 on the side opposite to the adjustment hole 120. A cover plate 170 is fitted over the opening of the through groove 160, and the cover plate 170 is screwed or snapped to the outer surface of the main body shell 100. Preferably, the outer edge of the through groove 160 has screw holes and recesses for installing the cover plate 170, so that the cover plate 170 can be locked and fixed to the through groove 160 by screws. The through groove 160 actually provides an inspection window for the main body shell 100 and an operation window for the installation of the pulling assembly 300 in the cavity 110. In addition, the cover plate 170 is used to block the through groove 160 to prevent chips and debris from entering the cavity 110 of the main body shell 100.

[0037] Furthermore, in this embodiment, the curved body 200 has a C-shaped structure with its opening facing the pull core 310. The pull core 310 is located inside the curved body 200 and below its top. Specifically, the curved body 200 includes a first horizontal portion and a second horizontal portion arranged opposite each other in the vertical direction, and a vertical portion connecting the first horizontal portion and the second horizontal portion. The first horizontal portion is located above the pull core 310, and the end of the second horizontal portion corresponds to the end of the driving member 400. More preferably, the bottom of the first horizontal portion is provided with an arc-shaped groove for engaging with the top of the pull core 310, so as to avoid slippage when the curved body 200 presses the pull core 310 and ensure the reliability of the driving of the pull core 310 by the curved body 200. The end face of the second horizontal portion is flat to ensure that the horizontal pressing force of the driving member 400 on the curved body 200 is large and to avoid slippage when the end face of the second horizontal portion has a slope.

[0038] In one embodiment, the driving component 400 is a driving bolt, and the adjusting hole 120 is a threaded hole that engages with the driving bolt. Thus, by rotating the driving bolt, the insertion depth of the driving bolt into the cavity 110 can be adjusted, thereby adjusting the magnitude of the driving force exerted by the driving bolt on the bent body 200, and ultimately adjusting the lifting distance of the inner conical sleeve 600. In other embodiments, the driving component 400 can also be a pin with arc-shaped ridges on its ring-shaped side, and the adjusting hole 120 is a circular hole with a protrusion on its inner surface that engages with the arc-shaped ridges. This allows the insertion depth of the driving component 400 into the cavity 110 to be adjusted by pushing or pulling out the driving component 400, ultimately achieving the purpose of adjusting the lifting distance of the inner conical sleeve 600. Furthermore, to facilitate control of the clamping force of the elastic chuck 500 on the product, in one embodiment, the drive member 400 is provided with marking scale lines along its length. During product clamping, the operator can determine the insertion depth of the drive member 400 based on the marking scale lines on the drive member 400 corresponding to the outer edge of the adjustment hole 120. This avoids excessive lifting distance of the inner conical sleeve 600, which could cause excessive clamping force from the elastic chuck 500 and result in product damage, thus reducing the product defect rate. In this embodiment, the elastic member 340 is a spring.

[0039] In order to enable the bending body 200 to swing within the cavity 110, in one embodiment, the hand-lock automatic centering fixture 10 further includes a bending body fixing pin 800, which passes through two opposite side walls of the main body housing 100 and is connected to the bending body 200 to define the swing center of the bending body 200. Furthermore, in one embodiment, the bending body fixing pin 800 is fixedly connected to the bending body 200. The two opposite side walls of the main body shell 100 are provided with insertion holes 180 for rotatably inserting the bending body fixing pin 800. The two ends of the bending body fixing pin 800 are fitted with first buckles 181 that abut against the outer surface of the main body shell 100. In this case, when the bending body 200 is pushed by the driving member 400, the bending body 200 and the bending body fixing pin 800 swing synchronously around the rotational mating part between the bending body fixing pin 800 and the main body shell 100. The first buckles 181 are used to position the bending body fixing pin 800 to prevent the positioning pin of the bending body 200 from falling off the main body shell 100, so as to avoid the bending body 200 from swinging failure. In another embodiment, the bending body fixing pin 800 is fixedly connected to the two opposite side walls of the main body shell 100, and the bending body 200 is rotatably sleeved on the bending body fixing pin 800. In this case, when the bending body 200 is pushed by the driving member 400, the bending body 200 swings in the vertical plane with the bending body fixing pin 800 as the center.

[0040] In one embodiment, the two opposite sidewalls of the main body shell 100 are further provided with guide holes 190. The pull pin 320 passes through the guide holes 190 and can move up and down vertically within the guide holes 190. The two ends of the pull pin 320 are provided with second latches 191 that abut against the outer side of the connecting rod 330. Preferably, the guide hole 190 has a racetrack-shaped structure and extends vertically. The guide hole 190 is used for the installation and positioning of the pull pin 320, and also for guiding the pull pin 320 during the lifting process, so as to avoid shaking during the lifting of the connecting rod 330 driven by the pull pin 320, and to ensure the reliability of the lifting of the inner cone sleeve 600. In this embodiment, the outer side of the connecting rod 330 refers to the side of the connecting rod 330 facing away from the cavity 110. In addition, the end of the connecting rod 330 away from the core pin 320 is connected to the outer wall screw of the inner conical sleeve 600 or sleeved through a limiting pin, so that the connecting rod 330 drives the inner conical sleeve 600 to rise and fall synchronously.

[0041] In one embodiment, the top of the main housing 100 is provided with a threaded post 101, and the bottom of the elastic chuck 500 is sleeved on the threaded post 101 and threadedly connected to the threaded post 101 to achieve a fixed connection between the elastic chuck 500 and the top of the main housing 100. Furthermore, the top of the threaded post 101 is also provided with an insertion hole, and the bottom of the elastic chuck 500 is provided with a protrusion for insertion into the insertion hole, so as to achieve pre-positioning of the elastic chuck 500 during installation. At least two elastic limiting members 520 are circumferentially distributed on the upper part of the elastic chuck 500, and each elastic limiting member 520 together forms a product clamping area 510 for clamping products. Specifically, in this embodiment, four elastic limiting members 520 are evenly distributed in a ring on the upper part of the elastic clamp 500. An expansion joint 530 is provided between two adjacent elastic limiting members 520. The expansion joint 530 provides a movement margin for the convergence and separation of the four elastic limiting members 520. The upper inner side of the four elastic limiting members 520 is respectively provided with a platform for receiving products or an arc-shaped notch for clamping products.

[0042] The automatic centering clamp 10 of the present invention has a compact structure, low cost, and low failure rate. By adjusting the insertion depth of the simple drive component 400, the bending body 200 is pushed to swing, and the pull core 310 is driven by the lever principle to achieve high-precision positioning and clamping of precision parts. The clamping accuracy is high. While having the advantages of traditional clamps such as flexible installation and disassembly and strong interchangeability, it also has the advantages of simple and compact structure, extremely low failure rate, high-precision self-centering function, and small space occupation. It can effectively reduce production and processing costs and can be used on three-axis, four-axis, and five-axis CNC machining centers. It is easy and quick to install.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A hand-lock automatic centering clamp, characterized in that, include: The main body shell has a cavity inside, and the side of the main body shell has an adjustment hole communicating with the cavity; A curved body is housed within a cavity and can swing in a vertical plane. The weight from the bottom of the curved body to its swing center is greater than the weight from the top of the curved body to its swing center. The distance from the swing center of the curved body to the bottom section is greater than or equal to the distance from the swing center of the curved body to the top section. The section from the swing center of the curved body to the bottom section is a counterweight section. The curved body has a C-shaped structure with its opening facing the pull core. The pull core is located inside the curved body and below its top. The curved body includes a first horizontal section and a second horizontal section arranged opposite each other in the vertical direction, and a vertical section connecting the first horizontal section and the second horizontal section. The first horizontal section is located above the pull core, and the end of the second horizontal section corresponds to the end of the drive component. The bottom of the first horizontal section has an arc-shaped groove for engaging with the top of the pull core, and the end face of the second horizontal section is a plane. A pulling assembly includes a core and a core pin housed within a cavity, a pair of connecting rods located on the outside of the main body housing and arranged opposite to each other, and an elastic element fixed to the bottom of the core. The core pin passes through two opposite side walls of the main body housing and is connected to the core to move up and down synchronously with the core. Each end of the core pin is connected to one of the connecting rods. A drive unit is telescopically inserted into the adjustment hole to push the bottom of the bend to swing the bend, and the top of the bend presses against the pull core when the bend swings, so that the elastic element at the bottom of the pull core abuts against the drive unit; The elastic chuck is located on the outside of the main body shell and is fixedly connected to the top of the main body shell. The top of the elastic chuck is provided with an adjustable product clamping area. An inner conical sleeve is fitted onto an elastic clamp and connected to two connecting rods. The inner surface shape of the inner conical sleeve is adapted to the outer surface shape of the elastic clamp. When the drive unit pushes the bending body, the pull core is squeezed and descends by the bending body. The pull core pin drives the connecting rod to descend, causing the inner conical sleeve to descend relative to the elastic chuck, thereby adjusting the size of the product clamping area and clamping or releasing the product clamped in the product clamping area. When the drive unit leaves the bending body, the bending body swings back. The pull core is pushed by the elastic element, causing the pull core pin and connecting rod to rise, causing the inner conical sleeve to rise relative to the elastic chuck, thereby adjusting the size of the product clamping area and clamping or releasing the product clamped in the product clamping area.

2. The automatic centering clamp for hand locks according to claim 1, characterized in that, It also includes a bending body fixing pin, which passes through two opposite side walls of the main body shell and connects to the bending body to define the swing center of the bending body.

3. The automatic centering clamp for hand locks according to claim 2, characterized in that, The bending body fixing pin is fixedly connected to the bending body. The two opposite side walls of the main body shell are provided with insertion holes for rotating and inserting the bending body fixing pin. The two ends of the bending body fixing pin are fitted with first buckles that abut against the outer surface of the main body shell.

4. The automatic centering clamp for hand locks according to claim 2, characterized in that, The bending body fixing pin is fixedly connected to the two opposite side walls of the main body shell, and the bending body is rotatably sleeved on the bending body fixing pin.

5. The automatic centering clamp for hand locks according to claim 3 or 4, characterized in that, The main body shell has guide holes on its two opposite side walls. The pull pin passes through the guide holes and can move up and down vertically within the guide holes. The two ends of the pull pin are provided with second buckles that abut against the outer side of the connecting rod. The driving component is a driving bolt, and the adjusting hole is a threaded hole that is threaded to the driving bolt. The elastic component is a spring.

6. The automatic centering clamp for hand locks according to claim 5, characterized in that, The main body shell has a through groove on the side facing away from the adjustment hole that communicates with the cavity, and the opening of the through groove is covered with a cover plate.

7. The automatic centering clamp for hand locks according to claim 6, characterized in that, The top of the main body shell is provided with a threaded post, the bottom of the elastic clamp is sleeved on the threaded post and threadedly connected to the threaded post, and at least two elastic limiting members are distributed in a ring on the upper part of the elastic clamp, and the elastic limiting members together form the product clamping area for clamping the product.

8. The automatic centering clamp for hand locks according to claim 7, characterized in that, It also includes a base, the upper surface of which has a boss in the middle, and the bottom of the main body shell has a through hole that communicates with the cavity. The main body shell is fitted onto the boss through the through hole and bolted to the base.

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