A fixture for pin shaft drilling

Abstract

The present invention discloses a fixture for pin drilling, belonging to the technical field of auxiliary equipment for pin drilling processing. Using the lever principle, a lever, a pressing block and a triangular wedge block are designed. By using the lever principle, the cylinder drives the triangular wedge block, driving one end of the lever to move on the inclined plane, and the other end drives the pressing block to move up and down to achieve the purpose of pressing the pin. Combined with the downward force of the pin given when the tool drills from top to bottom, the pin is better clamped. It can realize the rapid clamping and positioning of multiple pins during batch processing, and can also integrate the disassembly and installation processes, simplify the overall structure of the fixture, with low cost, convenient loading and unloading, facilitate batch processing of multiple pins at one time, greatly improve the production efficiency of pins, have good clamping effect and high stability, be suitable for mass production, and have strong practicability.

Description

Technical Field

[0001] The invention belongs to the technical field of auxiliary equipment for pin drilling processing, and particularly relates to a fixture for pin drilling. Background Technique

[0002] In daily production, a huge number and a wide variety of pins are required for various mechanical equipment such as supports, middle troughs, and coal mining. Each set of supports has dozens of thousands of pins to be processed. Among pin products, cylindrical pins are commodity fasteners with a large production and wide use, and are also irreplaceable fastener products. As is known in the machinery industry, in order to facilitate the addition of lubricating oil, pins of mechanical equipment will be drilled, and the pins need to be fixed during drilling. Most of the traditional pin drilling limiting mechanisms limit the upper end head of the vertically placed pin. When the drilling machine drills the pin from one side, it is single-headed stressed, which easily causes residual stress inside the processed pin and affects its mechanical properties.

[0003] Such as Figure 13 shown, the prior art CN208788020U discloses a pin clamping device. By setting a positioning groove 511 on the clamping fixture 51 for horizontally placing the pin to be processed, driving the handle 52 to drive the lead screw 53 to rotate, and then driving the pressing block 54 to move downward, finally the convex portion 541 on the pressing block 54 presses on the pin in the positioning groove 511 of the clamping fixture 51, so as to facilitate the drill bit on the processing device to punch or drill the pin. Although this fixture solves the problem of single-headed stress and residual stress generated by drilling in the traditional drilling limit, this fixture needs to manually adjust the driving handle 52, with low clamping efficiency, time-consuming and laborious, and is only suitable for processing a single pin at a time, with low processing efficiency. The problem of low efficiency is particularly obvious for batch processing.

[0004] Such as Figure 14As shown in the figure, the prior art CN208342271U discloses a quick loading and unloading fixing mechanism for pin drilling, which is suitable for batch processing of multiple pins 4 at one time. When fixedly installing, first arrange multiple pins side by side between two cushion blocks 61. Then, use a rectangular pressing plate 62 to press all the pins 4 between the rectangular pressing plate 62 and the cushion blocks 61. Then, tighten the nut 64 on the vertical screw 63 above the pressing plate 62 to complete the fixing of the pins 4. When disassembling, loosen the nut 64 to load and unload the pins 4, greatly simplifying the loading and unloading process. Although this patent application can fix multiple pins 4 at the same time for drilling processing, when batch processing multiple pins 4 at one time, each time of clamping / disassembling, it is necessary to twist the nuts 64 and the pressing plate 62 between multiple pins 4 multiple times. Disassembly is time-consuming and laborious. Moreover, as the number of pins 4 increases, the pressing plate 62, the vertical screw 63 and the nut 64 all need to be increased in batches, resulting in a complex structure of the entire fixing mechanism and an increase in cost. And because the used cushion blocks 61 are placed in pairs to hold a batch of pins 4, after a long time of use, the overall height will be inconsistent with the height of the pressed surface of the pins 4, and then the direction of the pressing force will not be perpendicular to the pressed surface of the pins 4, which will cause unreliable pressing of the pins 4, the nut 64 is easy to loosen, there are certain safety hazards, it is not conducive to ensuring product quality, and it will also cause varying degrees of damage to the threads of the vertical screw 63 and the nut 64, and even damage.

[0005] Therefore, in order to solve the problem of low clamping efficiency in batch production of pins in the prior art, considering quick installation and disassembly, reliable positioning and simple structure, it is necessary to make a targeted improvement design for the tooling fixture for pin drilling. Summary of the Invention

[0006] The purpose of the present invention is to solve the deficiencies in the prior art, and discloses a tooling fixture for pin drilling. This fixture can realize the quick clamping and positioning of multiple pins, and can also integrate the disassembly and installation processes, simplify the overall structure of the fixture, facilitate loading and unloading, facilitate batch processing of multiple pins at one time, greatly improve the production efficiency of pins, have good clamping effect, high stability, be suitable for mass production, and have strong practicability.

[0007] To achieve the above object, the present invention provides a tooling fixture for pin drilling, including a clamping main body for clamping pins, a driving main body located on one side of the clamping main body and giving the clamping main body driving force, and a placing main body for horizontally placing multiple pins to be processed and restricting the front-back, left-right movement of the pins. Among them,

[0008] The clamping main body includes a triangular wedge block, a lever, a pressing block, a fixing stud, and a lever support; the upper end of the pressing block is formed with an inverted trapezoid, and the inclined surfaces on both sides of the inverted trapezoid are in contact with the outer peripheral surfaces of two adjacent pins on both sides of the inverted trapezoid;

[0009] The lever is in the shape of a rectangular bar. One end thereof contacts with the inclined plane formed above the triangular wedge block. The middle part is detachably connected to the lever support serving as a support point. The other end is detachably connected to the lower end of the pressing block. The bottom of the lever support is installed in the placing body and is horizontally placed.

[0010] An arc-shaped groove that fits the outer peripheral wall of the pin shaft is formed on the outer peripheral surface of the upper end of the fixed stud. The bottom end of the fixed stud is connected to the placing body, and is symmetrically distributed in pairs on both sides of the pressing block, and the arc-shaped grooves are all in contact with the outer peripheral walls of the adjacent pin shafts.

[0011] The bottom of the lever support is installed in the placing body. The ratio of the number of the fixed studs to the number of the pin shafts is 2n:1, where n is an integer and n>1.

[0012] One side of the triangular wedge block opposite to the inclined plane is fixedly connected to the driving body. After being fixedly connected, the driving body drives the triangular wedge block to move left and right, drives one end of the lever in contact with the inclined plane to move up and down along the inclined plane, thereby driving the lower end of the pressing block connected to the other end of the lever to make a reverse vertical movement up and down, so that the inverted trapezoid of the pressing block moves accordingly, thereby clamping the adjacent pin shafts. Since the drilling tool drills the pin shaft from top to bottom and applies a downward pressure to the pin shaft at the same time, the inverted trapezoid formed at the upper end of the pressing block applies downward and outward forces to the pin shaft, making the arc-shaped groove of the fixed stud and the outer peripheral wall of the pin shaft fit more closely. Combined with the restriction of the placing body on the front, back, left and right directions of the pin shaft, the clamping of a batch of pin shafts is truly realized. The disassembly and clamping are very convenient, avoiding the time waste of disassembling and installing by repeatedly turning the nut and the pressing plate in the prior art two, saving time and effort, being convenient and fast. By driving the triangular wedge block to move left and right by the driving body and driving the pressing block to move up and down by the lever, the process of automatic clamping is realized, avoiding the difficulty of manual adjustment in the prior art one, improving the overall processing efficiency. The whole fixture has a simple structure and is easy to manufacture, and can process multiple pin shafts in batch at one time.

[0013] Further, the detachable connections are all shaft connections. After being connected, the lower end of the pressing block can rotate around the shaft, and the lever can rotate around the shaft. The rotation around the shaft makes the clamping process smoother, the energy consumption of the whole operation smaller, and the service life of the whole fixture prolonged.

[0014] Further, one end of the lever in contact with the inclined plane is spherical. The contact between the sphere and the inclined plane is smoother, the friction is smaller, the energy consumption is small, and the service life of the whole fixture is prolonged.

[0015] Further, the distance between the lever support and the pressing block is less than the distance between the lever support and the triangular wedge block. According to the lever principle, with the lever support as the fulcrum, the distance between the lever support and the pressing block is the resistance arm, and the distance between the lever support and the triangular wedge block is the power arm. Given the condition of power * power arm = resistance * resistance arm, such a design with the power arm longer than the resistance arm makes the entire fixture more labor-saving during operation.

[0016] Further, the lever support is U-shaped, and the middle part of the lever is placed inside the U-shape and is coupled to the lever support shaft. The U-shaped support makes the entire fixture more stable and more efficient in clamping after installation.

[0017] Further, the driving body is a cylinder. Using a cylinder makes the structure of the entire fixture simpler, more compact, and easier to manufacture. The air source is convenient to obtain and easy to store.

[0018] Further, the placement body includes a support platform for supporting the clamping body, a return frame for placing a plurality of pins to be processed, a support frame for fixing the return frame and restricting the left-right movement of the pins to be processed, and two limit plates for restricting the front-back movement of the pins to be processed. The two limit plates are installed in parallel on the return frame. The bottom end of the fixed stud and the lever support are both installed on the support platform. The plurality of pins to be processed are distributed on both sides of the pressing block. The design of the entire placement body is simple and easy to manufacture. Together with the clamping body, it improves the stability of the pin clamping process and provides a better processing environment for the drilling operation.

[0019] Further, a stop block is installed between the support frame and the adjacent pin. The stop block is designed to be movable and can be designed according to the remaining space size after placing a batch of pins. Together with the pressing block and the fixed stud, the three cooperate to increase the clamping force for clamping the pins and improve the stability of fixing the pins.

[0020] Further, a cross beam is provided in the middle of the return frame, and a limit plate is fixed above the cross beam. The three limit plates are parallel to each other, and the pins to be processed are placed between the three limit plates. The design of the cross beam is to provide a certain supporting force for the pins when processing longer pins to stabilize the pins. The limit plate fixed above the cross beam is suitable for the case of placing short pins that need to be processed in batches in front of and behind the cross beam. That is, this design is to freely decide whether to use the limit plate above the cross beam according to the length of the pins to be processed, with strong operability and a wide range of applications.

[0021] The beneficial effects of the present invention are:

[0022] 1. The present invention designs a lever, a clamping block and a triangular wedge block. By using the lever principle, the triangular wedge block is driven by a cylinder, one end of the lever is driven to move on the slope surface, and the other end drives the clamping block to move up and down, so as to achieve the purpose of clamping the pin shaft, realize automatic operation, and solve the problem of manually adjusting the clamp in the prior art 1.

[0023] 2. The present invention designs the end of the lever to be in the shape of a sphere, so that the sliding on the slope surface is smoother, the friction force is smaller, the power consumption is smaller, and the life of the entire clamp is extended;

[0024] 3. The transmission of the present invention adopts shaft transmission, which is oil-free and maintenance-free, and has low power loss and high driving efficiency;

[0025] 4. The lever support of the present invention is U-shaped, which makes the entire clamp more stable when fixed on the support platform and more stable when clamping the pin shaft;

[0026] 5. The present invention designs an inverted trapezoid at the upper end of the clamping block, with a structure that is larger at the top and smaller at the bottom, so that when the inverted trapezoid moves downward, it slowly provides clamping force to the pins on both sides, and cooperates with the arc-shaped groove of the fixed stud to provide a clamping force to limit the upward and downward movement of the pins, and the clamping is tighter. The circular frame and the limit plate limit the forward and backward movement of the pins, thereby clamping the pins as a whole. When disassembling the pins, the inverted trapezoid moves upward directly through the lever movement, so that the clamping force can be eliminated, thereby easily disassembling the pins. It is suitable for use in batch processing of pins, has a simple structure, and a more stable clamping process, which solves the problems of complex structure, cumbersome clamping and disassembly processes, and time-consuming and labor-intensive problems in the prior art 2 in the background technology;

[0027] 6. The present invention designs a crossbeam and fixes a limit plate on the crossbeam, which is used for batch processing of multiple short-sized pins. When batch processing of multiple long pins, the limit plate fixed on the crossbeam can be eliminated, making processing more convenient.

[0028] In summary, the pin drilling tooling fixture of the present application can realize the rapid clamping and positioning of multiple pins, and can integrate the disassembly and installation processes, simplifying the overall structure of the fixture, facilitating loading and unloading, and facilitating the processing of multiple pins at one time, greatly improving the production efficiency of the pins, having good clamping effect, high stability, being suitable for mass production, and having strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the pin drilling fixture of the present invention;

[0030] Figure 2 for Figure 1 A top view of;

[0031] Figure 3 for Figure 1Front view;

[0032] Figure 4 is Figure 1 Schematic structural diagram after assembly of the wedge block, lever, pressing block, lever support, and coupling shaft in the clamping body;

[0033] Figure 5 is Figure 4 Schematic structural diagram of the pressing block;

[0034] Figure 6 is Figure 5 Side view of the pressing block;

[0035] Figure 7 is Figure 5 Top view of the pressing block;

[0036] Figure 8 is Figure 4 Schematic structural diagram of the lever;

[0037] Figure 9 is Figure 8 Left view;

[0038] Figure 10 is Figure 2 Schematic structural diagram of the fixed stud;

[0039] Figure 11 is Figure 3 Top view of the looped frame;

[0040] Figure 12 Schematic diagram of the fixture for pin drilling of the present invention after installing the pin;

[0041] Figure 13 Schematic structural diagram of the prior art I;

[0042] Figure 14 Schematic structural diagram of the prior art II;

[0043] Wherein, 1 - clamping body, 11 - triangular wedge block, 111 - ramp surface, 112 - vertical surface, 113 - horizontal surface, 12 - lever, 121 - spherical end, 122 - long strip body, 13 - pressing block, 131 - inverted trapezoid, 132 - shaft connection part, 1321 - shaft mounting hole, 14 - fixed stud, 141 - arc groove, 142 - fixing part, 15 - lever support, 16 - coupling shaft, 161 - first coupling shaft, 162 - second coupling shaft, 163 - third coupling shaft, 17 - stop block, 2 - driving body, 3 - placing body, 31 - support platform, 32 - looped frame, 321 - cross beam, 33 - support frame, 331 - left support plate, 332 - right support plate, 34 - limiting plate, 4 - pin. Detailed implementation mode

[0044] The following embodiments further illustrate the content of the present invention, but should not be construed as limiting the present invention. Without departing from the essence of the present invention, modifications and substitutions made to the methods, steps or conditions of the present invention all fall within the scope of the present invention.

[0045] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the combination or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention. In addition, during the description of the embodiments of the present invention, for the positional relationships of "upper", "lower", "front", "rear", "left", "right", etc. of all the devices in the drawings, they are all based on Figure 1 as the standard.

[0046] Embodiment 1:

[0047] As Figures 1 - 3 shown, the fixture for pin shaft drilling provided by the present invention includes a clamping main body 1 for clamping the pin shaft, a driving main body 2 located on one side of the clamping main body 1 and giving the clamping main body 1 a driving force, and a placing main body 3 for horizontally placing a plurality of pin shafts to be processed and restricting the pin shafts from moving back and forth, left and right. Among them,

[0048] As Figures 4 - 7 shown, the clamping main body 1 includes a triangular wedge block 11, a lever 12, a pressing block 13, a fixing stud 14, and a lever support 15. The upper end of the pressing block 13 is formed with an inverted trapezoid 131, a shaft connection part 132, and a shaft mounting hole 1321. The inclined surfaces on both sides of the inverted trapezoid 131 are in contact with the outer peripheral surfaces of two adjacent pin shafts located on both sides of the inverted trapezoid 131. The triangular wedge block 11 includes a slope surface 111, a vertical surface 112, and a horizontal surface 113. The horizontal surface 113 is the bottom surface of the triangular wedge block 11. Of course, the bottom surface can be designed in any shape, and the horizontal surface 113 is the shape that is easiest to process.

[0049] As Figures 8 - 9 shown, the lever 12 is a rectangular strip structure, one end is in contact with the slope surface 111 formed above the triangular wedge block 11, the middle part is detachably connected to the lever support 15 as a support point, and the other end is detachably connected to the lower end of the pressing block 13. The bottom of the lever support 15 is installed in the placing main body 3 and is horizontally placed;

[0050] As Figure 10As shown, an arc-shaped groove 141 that fits the outer peripheral wall of the pin shaft is formed on the outer peripheral surface of the upper end of the fixed stud 14. The bottom end of the fixed stud 14 is connected to the placing body 3, symmetrically distributed in pairs on both sides of the pressing block 13, and the arc-shaped groove 141 is in contact with the outer peripheral wall of the adjacent pin shaft;

[0051] The bottom of the lever support 15 is installed in the placing body 3. The ratio of the number of fixed studs 14 to the number of pin shafts is 2n:1, where n is an integer and n > 1. As Figure 12 described, such a design ensures that there is at least one pair of fixed studs 14 on both sides of the pin shaft 4 to be processed. The optimal solution is as Figure 12 shown, there are two pairs of fixed studs 14 on both sides of one pin shaft 4. In the actual processing process, the user can determine the number of fixed studs 14 according to the number and outer diameter of the pin shafts 4 to be processed.

[0052] On the side of the triangular wedge block 11 opposite to the inclined plane 111, the vertical plane 112 is fixedly connected to the driving body 2. After being fixedly connected, the driving body 2 drives the triangular wedge block 11 to move left and right, driving one end of the lever 12 in contact with the inclined plane 111 to move up and down along the inclined plane 111, thereby driving the lower end of the pressing block 13 connected to the other end of the lever 12 to move vertically in the opposite direction, so that the trapezoid 131 of the pressing block 13 follows the movement, thereby clamping the adjacent pin shafts. Since the drilling tool drills the pin shaft from top to bottom and applies a downward pressure to the pin shaft at the same time, the trapezoid 131 formed at the upper end of the pressing block 13 applies a downward and outward force to the pin shaft, making the arc-shaped groove 141 of the fixed stud 14 fit more tightly with the outer peripheral wall of the pin shaft. Combined with the restriction of the placing body on the front, back, left, and right directions of the pin shaft, the clamping of a batch of pin shafts is truly realized. The disassembly and clamping are very convenient, avoiding the waste of time in disassembling and installing by repeatedly turning the nut and the pressing plate in the second prior art. It saves time and effort, is convenient and fast. By driving the triangular wedge block 11 to move left and right by the driving body 2 and driving the pressing block 13 to move up and down by the lever 12, the process of automatic clamping is realized, avoiding the difficulty of manual adjustment in the first prior art, improving the overall processing efficiency. The whole fixture has a simple structure and is easy to manufacture, and can process multiple pin shafts in batch at one time.

[0053] The driving body 2 is a cylinder. Using a cylinder makes the structure of the whole fixture simpler, more compact, and easier to manufacture. The air source is convenient and easy to store.

[0054] In order to make the clamping process smoother and the energy consumption of the whole operation smaller, all the detachable connections are shaft connections, as Figure 4As shown in the figure, the coupling shaft 16 for shaft connection includes a first coupling shaft 161, a second coupling shaft 162, and a third coupling shaft 163. The first coupling shaft 161 is used to connect the lever 12 and the pressing block 13, and is installed in the shaft mounting hole 1321 formed on the shaft connection portion 132 at the lower part of the pressing block 13. The second coupling shaft 162 is used to connect the lever 12 and the lever support 15, with a sliding connection. The third coupling shaft 163 is used to connect the cylinder and the vertical surface 112 of the wedge block 11, with a threaded fastening connection. After connection, the lower end of the pressing block 13 can rotate around the first coupling shaft 161, the lever 12 can rotate around the second coupling shaft 162, and the cylinder can push / pull the triangular wedge block 11 to move left and right depending on the third coupling shaft 163. In order to make the rotation smoother, a rolling bearing can be sleeved on the outer periphery of the shaft, and the shaft rotates, which extends the service life of the entire fixture.

[0055] In order to make the movement smoother, with less friction and lower energy consumption, one end of the lever 12 that contacts the ramp surface 111 is spherical, that is Figure 8 the end spherical shape 121 as described in the figure. The end spherical shape 121 contacts the ramp surface, thereby extending the service life of the entire fixture.

[0056] In order to make the entire fixture more labor-saving during operation, the distance between the lever support 15 and the pressing block 13 is less than the distance between the lever support 15 and the triangular wedge block 11. According to the lever principle, the lever support 15 is the fulcrum, the distance between the lever support 15 and the pressing block 13 is the resistance arm, and the distance between the lever support 15 and the triangular wedge block 11 is the power arm. If designed in this way under the condition of ensuring that power × power arm = resistance × resistance arm, the length of the power arm is greater than the length of the resistance arm, which will make the entire fixture more labor-saving during operation.

[0057] The lever support 15 is U-shaped, and the middle part of the lever 12 is placed inside the U-shape and is axially connected to the lever support 15. The U-shaped support makes the entire fixture more stable and the clamping efficiency higher after installation.

[0058] As Figures 2 - 3 shown, in order to make the entire clamping body 1 more stable when installed in the placing body 3, the placing body 3 includes a support platform 31 for supporting the clamping body 1, a loop-shaped frame 32 for placing a plurality of pins to be processed, a support frame 33 for fixing the loop-shaped frame 32 and restricting the left and right movement of the pins to be processed, and two limiting plates 34 for restricting the front and back movement of the pins to be processed.

[0059] The support frame 33 includes a left support plate 331 and a right support plate 332. The left support plate 331 and the right support plate 332 are respectively fixed to both sides of the rectangular frame 32. The support platform 31 is installed below the rectangular frame 32, and the left and right sides are respectively fixedly connected to the left support plate 331 and the right support plate 332.

[0060] Two of the limiting plates 34 are installed in parallel on the front and rear beams of the rectangular frame 32. The bottom end of the fixed stud 14 and the lever support 15 are both installed on the support platform 31. A plurality of the pins to be processed are distributed on both sides of the pressing block 13. The design of the entire placement body is very simple and easy to manufacture. Together with the clamping body, the stability of the pin clamping process is improved, providing a better processing environment for the drilling process.

[0061] In order to stably fix the pin 4, a stop block 17 is installed between the support frame 33 and the adjacent pin. As Figure 2 shown, the stop block 17 is designed to be movable and can be designed according to the remaining space size after placing a batch of pins. Together with the pressing block 13 and the fixed stud 14, the three cooperate with each other, increasing the clamping force of the clamped pin and improving the stability of the fixed pin.

[0062] A cross beam 321 is provided in the middle of the rectangular frame 32. A limiting plate 34 is fixed above the cross beam 321. The three limiting plates 34 are parallel to each other. The pin to be processed is placed between the three limiting plates 34. The design of the cross beam 321 is to provide a certain supporting force for the pin when processing pins with a longer length, stabilizing the pin. The limiting plate 34 is fixed above the cross beam 321, which is suitable for the case of placing short pins that need to be batch processed before and after the cross beam 321. That is, this design is to freely decide whether to use the limiting plate 34 above the cross beam 321 according to the length of the processed pin, with strong operability and a wide range of uses.

[0063] In summary, compared with the prior art, the pin drilling fixture of the present application can realize the rapid clamping and positioning of multiple pins during batch processing, integrating the disassembly and installation processes while saving time and effort, simplifying the overall structure of the fixture, having a low cost, being convenient for loading and unloading, facilitating the batch processing of multiple pins at one time, greatly improving the production efficiency of pins, having a good clamping effect and high stability, being suitable for mass production, and having strong practicability.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. However, the above is only a preferred embodiment of the present invention, and the technical features of the present invention are not limited thereto. Any other embodiments obtained by those skilled in the art without departing from the technical solution of the present invention should be covered within the patent scope of the present invention.

Claims

1. A fixture for pin drilling, characterized in that, it includes a clamping body (1) for clamping the pin, a driving body (2) located on one side of the clamping body (1) and giving the clamping body (1) a driving force, and a placing body (3) for horizontally placing the pin and restricting the pin from moving longitudinally and laterally. Among them, the clamping body (1) includes a triangular wedge block (11), a lever (12), a pressing block (13), a fixed stud (14), and a lever support (15); an inverted trapezoid (131) is formed at the upper end of the pressing block (13), and the inclined surfaces on both sides of the inverted trapezoid (131) are in contact with the outer peripheral surfaces of two adjacent pins located on both sides of the inverted trapezoid (131); One end of the lever (12) is in contact with the inclined plane (111) formed above the triangular wedge block (11), the middle part is detachably connected to the lever support (15), and the other end is detachably connected to the lower end of the pressing block (13). The bottom of the lever support (15) is installed in the placing body (3); An arc-shaped groove (141) that fits the outer peripheral wall of the pin is formed on the outer peripheral surface of the upper end of the fixed stud (14). The bottom end of the fixed stud (14) is connected to the placing body (3). The fixed studs (14) are symmetrically distributed on both sides of the pressing block (13), and the arc-shaped grooves (141) are all in contact with the outer peripheral walls of adjacent pins; The bottom of the lever support (15) is installed in the placing body (3), and the ratio of the number of fixed studs (14) to the number of pins is 2n:1, where n is an integer and n>1; The side surface of the triangular wedge block (11) opposite to the inclined plane (111) is fixedly connected to the driving body (2). The driving body (2) drives the triangular wedge block (11) to move left and right. The driving body (2) drives one end of the lever (12) in contact with the inclined plane (111) to move up and down along the inclined plane (111), and then drives the lower end of the pressing block (13) connected to the other end of the lever (12) to move vertically in the opposite direction, so that the inverted trapezoid (131) of the pressing block (13) moves accordingly, thereby clamping adjacent pins; All the detachable connections are shaft connections. After connection, the lower end of the pressing block (13) can rotate around the shaft, and the lever (12) can rotate around the shaft; The placing body (3) includes a support platform (31) for supporting the clamping body (1), a return frame (32) for placing a plurality of pins to be processed, a support frame (33) for fixing the return frame (32) and restricting the pins to be processed from moving laterally, and two limit plates (34) for restricting the pins to be processed from moving longitudinally. The two limit plates (34) are installed in parallel on the return frame (32). The bottom end of the fixed stud (14) and the lever support (15) are both installed on the support platform (31), and a plurality of pins to be processed are distributed on both sides of the pressing block (13); A stop block (17) is installed between the support frame (33) and the adjacent pin; A crossbeam (321) is provided in the middle of the loop-shaped frame (32), and a limiting plate (34) is fixed above the crossbeam (321). The three limiting plates (34) are parallel to each other, and the pin to be processed is placed between the three limiting plates (34).

2. The fixture for pin drilling according to claim 1, characterized in that one end of the lever (12) in contact with the inclined plane (111) is spherical in shape.

3. The fixture for pin drilling according to claim 1, characterized in that the distance between the lever support (15) and the pressing block (13) is less than the distance between the lever support (15) and the triangular wedge block (11).

4. The fixture for pin drilling according to claim 1, characterized in that the lever support (15) is U-shaped, and the middle part of the lever (12) is placed inside the U-shape and is axially connected to the lever support (15).

5. The fixture for pin drilling according to claim 1, characterized in that the driving body (2) is a cylinder.

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