Inner support pressing clamp for watch rear cover hole site machining

Abstract

The utility model discloses an inner support pressing clamp for processing a hole site of a watch rear cover. The first piston and the second piston are contained in the air cylinder chamber and divide the air cylinder chamber into an upper air chamber, a middle air chamber and a lower air chamber, the piston rod is connected with the first piston and extends out of the bottom of the cylinder barrel, and the wedge head supporting rod is inserted into the upper air chamber and fixedly connected with the second piston. The inner supporting clamping blocks are arranged above the upper air chamber and surround the wedge head supporting rod, and the two crimping parts are oppositely arranged on the outer side of the air cylinder chamber and fixedly connected with the piston rod. When air enters the middle air chamber, the first piston moves downwards while the second piston moves upwards; the inner supporting clamping block is in sliding connection with the cylinder barrel in the radial direction of the cylinder barrel and is in limiting fit with the cylinder barrel in the height direction of the cylinder barrel, and the inner supporting clamping block is attached to the upper slope of the wedge head supporting rod and is in limiting fit with the wedge head supporting rod in the radial direction of the cylinder barrel so as to clamp a product when the wedge head supporting rod moves upwards; the top of the crimping part is provided with a crimping part; and the crimping part descends when the piston rod moves downwards, so that the crimping part presses the product.

Description

Technical Field

[0001] This utility model relates to the field of watch technology, and in particular to an inner support pressing fixture for machining holes in the back cover of a watch. Background Technology

[0002] When machining watch case backs using CNC (Computerized Numerical Control) machines, the case back must be pre-clamped and positioned using a fixture to control the relative position between the machining section and the product. Currently, the industry commonly uses an internal support jaw to hold the inner ring surface of the watch case back for positioning. For example, Chinese invention patent application (CN119501641A) discloses a dual-mechanism linkage internal support pressing fixture for machining the contoured surface of watch case backs. This fixture has three air chambers, driven by cylinders, which can simultaneously trigger radial horizontal movement and axial vertical movement, achieving linkage between the internal support and pressing of the jaws. However, the pressing structure of this internal support pressing fixture is located in the middle of the fixture. When machining holes in the watch case back, it cannot avoid the machining position of the watch case back window holes, interfering with the hole machining. If the middle pressing structure is removed and only the internal support structure is retained, the product will be unstable during machining, posing a risk of material movement and warping, thus increasing the defect rate. Utility Model Content

[0003] Therefore, it is necessary to address the above-mentioned shortcomings by providing an internal support pressing fixture for machining holes on the back cover of watches, which provides stable product positioning, is not prone to material movement or lifting, and can avoid the location of the holes to be processed.

[0004] An inner support pressing fixture for machining holes in watch back covers includes a cylinder with a cylinder chamber, a product placement block fixed to the top of the cylinder and used to support the product to be processed, a first piston and piston rod housed in the cylinder chamber, a second piston, a wedge support rod, multiple inner support clamping blocks, and two pressing parts.

[0005] The first piston is located below the second piston and together with the second piston, they divide the cylinder chamber to form an upper chamber, an intermediate chamber, and a lower chamber from top to bottom. One end of the piston rod is fixedly connected to the first piston, and the other end of the piston rod extends from the bottom of the cylinder and slides and seals with the cylinder. When air enters the intermediate chamber, the first piston and the second piston move in the opposite direction to the intermediate chamber, respectively. The lower part of the wedge head strut slides and seals into the upper chamber along the height of the cylinder and is fixedly connected to the second piston.

[0006] Multiple inner support clamping blocks are located above the upper air chamber and arranged around the wedge head support rod. The inner support clamping blocks are slidably connected to the cylinder along the cylinder radial direction and are limited to the cylinder along the cylinder height direction. The inner support clamping blocks are attached to the upper inclined surface of the wedge head support rod and are limited to the upper part of the wedge head support rod along the cylinder radial direction. When the wedge head support rod moves upward, the inner support clamping blocks slide along the cylinder radial direction to clamp the inner side wall of the product.

[0007] Two pressing components are arranged opposite each other on the outer side of the cylinder chamber. The pressing components are arranged along the height direction of the cylinder and fixedly connected to the piston rod. The top of the pressing component has a pressing part located above the product placement block. The pressing component descends when the piston rod moves down so that the pressing part presses the product.

[0008] In one embodiment, the cylinder includes a cylinder body, a main body located above the cylinder body and fixedly connected to the cylinder body, and a cylinder sealing disc located below the cylinder body and sealed to the cylinder body. The top of the cylinder body is provided with a top plate that is sealed and fixedly connected to the inner wall of the cylinder body. The main body is provided with a partition plate that is sealed and fixedly connected to the inner wall of the main body to separate the inner cavity of the main body into an upper groove and a lower groove. A first through hole is provided on the top plate, a second through hole is provided on the partition plate, and a third through hole is provided on the cylinder sealing disc for slidingly sealing and connecting the piston rod. A first piston is received in the cylinder body and forms a lower air chamber with the cylinder sealing disc. A second piston is located in the lower groove and forms an intermediate air chamber together with the first piston. The partition plate and the second piston form an upper air chamber together. The upper part of the main body is provided with a plurality of guide grooves arranged around the upper groove and correspondingly slidingly inserting into each inner support clamp. The guide grooves extend radially along the main body and communicate with the upper groove. The lower part of the wedge head support rod slides through the second through hole and is fixedly connected to the second piston. The upper part of the wedge head support rod is located in the upper groove.

[0009] In one embodiment, the width of the top of the guide groove is at least smaller than the width of the groove of the adjacent portion.

[0010] In one embodiment, the cylinder is screwed to the main body or integrally formed; the inner support pressing clamp also includes a mounting base for connecting to the turntable, the outer ring side of the cylinder extends outward to form a mounting part fixedly connected to the mounting base; or the mounting base is fixed with a plate bridge extending towards the cylinder, the plate bridge has mounting holes penetrating its upper and lower surfaces, the cylinder passes through the mounting holes and is fixedly connected to the plate bridge.

[0011] In one embodiment, the product placement block has a central protrusion to form a product receiving area. A clearance hole is provided on each of the two opposite sides of the product receiving area on the product placement block. The clearance hole penetrates the upper and lower surfaces of the product placement block. A plurality of clearance notches are provided on the product placement block, which correspond one-to-one with each guide groove.

[0012] In one embodiment, the cylinder barrel has two guide holes that are oppositely arranged and correspond one-to-one with two clearance holes on the outer side of the cylinder chamber. The guide holes penetrate the upper and lower surfaces of the cylinder barrel. The pressing member includes a pressing claw shaft that passes through the clearance hole and the guide hole and is fixedly connected to the piston rod, a pressing claw fixed on the top of the pressing claw shaft and protruding towards the product placement block to form the pressing part, and a flexible protective block fixed on the lower surface of the pressing claw.

[0013] In one embodiment, the inner support pressing clamp also includes a pressing claw plate located below the cylinder and fixedly connected to the piston rod, and the pressing claw shafts of the two pressing members are fixedly connected to the pressing claw plate respectively.

[0014] In one embodiment, the upper circumferential side of the wedge-head strut is provided with a plurality of T-shaped inclined bosses or T-shaped inclined grooves distributed around the central axis of the wedge-head strut and corresponding one-to-one with each inner support clamping block. The T-shaped inclined bosses or T-shaped inclined grooves extend obliquely and gradually move away from the center of the wedge-head strut from top to bottom. The inner support clamping block includes a slider and a support block fixed on the top of the slider for pressing the product. The shape of one side of the slider adjacent to the wedge-head strut is adapted to the shape of the T-shaped inclined boss or T-shaped inclined groove, and the slider slides in cooperation with the T-shaped inclined boss or T-shaped inclined groove.

[0015] In one embodiment, the support block has an L-shaped structure, including a horizontal part fixedly connected to the top of the slider, and a vertical part located on the horizontal part adjacent to the product end and perpendicularly connected to the horizontal part.

[0016] In one embodiment, the outer ring side of the cylinder is provided with a first air pipe connector, a second air pipe connector and a third air pipe connector arranged sequentially from top to bottom. The first air pipe connector is connected to the upper air chamber, the second air pipe connector is connected to the middle air chamber and the third air pipe connector is connected to the lower air chamber.

[0017] The present invention relates to an internal support pressing fixture for machining holes in watch back covers. A first piston and a second piston are installed within a cylinder chamber, which is divided into an upper chamber, a middle chamber, and a lower chamber. When air enters the middle chamber, the first piston moves downward and the second piston moves upward simultaneously. This causes the internal support clamping block to slide radially along the cylinder as the wedge-shaped support rod moves upward, clamping the inner wall of the product. Simultaneously, the pressing component moves downward and presses the product through the pressing part, thus limiting the product's vertical and horizontal movement and preventing warping during machining, thereby reducing the increased defect rate caused by warping. The two pressing components are positioned opposite each other outside the cylinder chamber. While jointly pressing the product and preventing warping, they also avoid the machining location of the viewing window hole, facilitating the normal machining of the viewing window hole. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the inner support pressing clamp connected to the turntable in one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the inner support pressing clamp connected to the turntable in one embodiment of the present invention, from another perspective.

[0020] Figure 3 This is a schematic diagram of the internal support pressing clamp in one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the first disassembled state of the inner support pressing clamp in one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the second disassembled state of the inner support pressing clamp in one embodiment of the present invention;

[0023] Figure 6 This is a cross-sectional structural diagram of the inner support pressing clamp in one embodiment of the present invention;

[0024] Figure 7 This is an exploded structural diagram of the inner support component in one embodiment of the present invention;

[0025] Figure 8 This is a half-sectional structural diagram of the decomposed pressing component in one embodiment of the present invention. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model 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 full understanding of this utility model. However, this utility model can be implemented 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 this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] Please combine Figure 1-8This utility model discloses an internal support pressing fixture for machining holes in watch back covers, which provides stable product positioning, prevents material movement and warping, and avoids the location of the holes to be processed. The internal support pressing fixture includes a cylinder 100 with a cylinder chamber, a product placement block 200 fixed to the top of the cylinder 100 for supporting the product to be processed, a first piston 300 and piston rod 400 housed in the cylinder chamber, a second piston 500, a wedge support rod 600, multiple internal support clamping blocks 700, two pressing parts 800, and a mounting base 900. Depending on their function, the aforementioned components are further divided into: a tooling assembly consisting of a product placement block 200 and a portion of an inner support clamping block 700 to support the product; an inner support assembly consisting of a portion of a cylinder 100, a second piston 500, a wedge head strut 600, and a portion of the inner support clamping block 700 to achieve radial movement of the inner support clamping block 700; a pressing assembly consisting of a pressing piece 800, a second piston 500, and a piston rod 400 to achieve the clamping action; and a clamp base assembly consisting of a mounting base 900 and related components to support the clamp and connect to the turntable 10 of the machine tool. The structure of each component and related parts is described below.

[0028] Inside the cylinder 100, the first piston 300 is located below the second piston 500 and together with the second piston 500, they separate the cylinder chamber to form an upper chamber 110, a middle chamber 120, and a lower chamber 130 from top to bottom. The first piston 300 has an annular groove on its ring side and a sealing ring is embedded in the annular groove. The second piston 500 also has an annular groove on its ring side and a sealing ring is embedded in the annular groove. In this way, the parts where the first piston 300 and the second piston 500 are in contact with the inner wall of the cylinder are sealed together to avoid air leakage at the connection parts between the first piston 300 and the inner wall of the cylinder and the second piston 500, thus ensuring the reliability of the lifting and lowering of the wedge head support rod 600 and the pressing part 800. The outer circumference of the cylinder 100 is provided with a first air pipe connector 140, a second air pipe connector 150, and a third air pipe connector 160 arranged sequentially from top to bottom. The first air pipe connector 140 communicates with the upper air chamber 110, the second air pipe connector 150 communicates with the middle air chamber 120, and the third air pipe connector 160 communicates with the lower air chamber 130. Specifically, the circumference of the cylinder 100 is provided with three vent holes corresponding to the first air pipe connector 140, the second air pipe connector 150, and the third air pipe connector 160. The first air pipe connector 140, the second air pipe connector 150, and the third air pipe connector 160 are fixed at the corresponding vent holes and communicate with an external air pressure device. One end of the piston rod 400 is fixedly connected to the first piston 300, and the other end of the piston rod 400 extends from the bottom of the cylinder 100 and slides and seals with the cylinder 100. When air enters the intermediate air chamber 120, the first piston 300 and the second piston 500 move in the direction away from the intermediate air chamber 120, respectively. The lower part of the wedge head support rod 600 slides and seals into the upper air chamber 110 along the height direction of the cylinder 100 and is fixedly connected to the second piston 500. In this embodiment, the first piston 300 and the piston rod 400 are screwed together or integrally formed.

[0029] Multiple inner support clamping blocks 700 are located above the upper air chamber 110 and arranged around the wedge head support rod 600. The inner support clamping blocks 700 are slidably connected to the cylinder 100 radially and are limited to the cylinder 100 in the height direction. The inner support clamping blocks 700 are attached to the upper inclined surface of the wedge head support rod 600 and are limited to the upper part of the wedge head support rod 600 in the radial direction of the cylinder 100. When the wedge head support rod 600 moves upward, the inner support clamping blocks 700 slide radially along the cylinder 100 to clamp the inner sidewall of the product. In other words, during the upward movement of the wedge head support rod 600, the wedge head support rod 600's inclined surface fits against the inner support clamping block 700, the wedge head support rod 600 and the inner support clamping block 700 are radially limited, the inner support clamping block 700 and the cylinder 100 slide together, and the inner support clamping block 700 and the cylinder 100 are limited along the height direction of the cylinder 100. This allows the inner support clamping block 700 to move closer to the edge of the cylinder 100, so that the inner support clamping block 700 can press against the inner side of the watch back cover, avoiding positioning gaps or interference caused by differences in the dimensions of the incoming materials when using the inner cavity contour positioning method. Correspondingly, two pressing parts 800 are arranged opposite each other on the outer side of the cylinder chamber. The pressing parts 800 are arranged along the height direction of the cylinder barrel 100 and fixedly connected to the piston rod 400. The top of the pressing parts 800 has a pressing part located above the product placement block 200. The pressing parts 800 descend when the piston rod 400 moves down, so that the pressing part presses the product. By pressing the product with the pressing parts 800, the lifting phenomenon caused by the internal support of the product can be avoided.

[0030] Thus, when air enters the intermediate air chamber 120, the first piston 300 and the second piston 500 move away from the intermediate air chamber 120, causing the piston rod 400 to move downward while the wedge head support rod 600 moves upward. The upward movement of the wedge head support rod 600 simultaneously drives the inner support clamping block 700 to move closer to the edge of the cylinder 100, clamping the inner side of the watch back cover. Simultaneously, the piston rod 400 drives the pressing part 800 downward, pressing the product against the pressing part. This achieves simultaneous radial (or horizontal) positioning of the product by multiple inner support clamping blocks 700 along the watch back cover and vertical positioning of the product by the pressing part 800. Conversely, when the product holes are machined, the intermediate air chamber 120 exhausts air, and the first piston 300 and the second piston 500 simultaneously move towards the intermediate air chamber 120, causing the piston rod 400 to move upward while the wedge head support rod 600 moves downward. The wedge head support rod 600 moves downward and simultaneously drives the inner support clamping block 700 to move away from the edge of the cylinder 100, so as to leave the inner side of the watch back cover. At the same time, the piston rod 400 drives the pressing part 800 to move upward, so that the pressing part leaves the product and contacts the limiting position on the product, so as to remove the processed product. In this way, the time for operators to clamp or remove the product can be reduced, the product loading and unloading efficiency can be improved, and the fault tolerance of the fixture can be increased.

[0031] The aforementioned internal support pressing clamp has a first piston 300 and a second piston 500 installed in the cylinder chamber, dividing the cylinder chamber into an upper chamber 110, a middle chamber 120, and a lower chamber 130. When the middle chamber 120 is filled with air, the first piston 300 is pushed down and the second piston 500 is pushed up simultaneously. This allows the internal support clamping block 700 to slide radially along the cylinder 100 when the wedge head support rod 600 moves up, thus clamping the inner wall of the product. At the same time, the pressing part 800 moves down and presses the product through the pressing part, thereby limiting the product in both the vertical and horizontal directions and preventing the product from warping during processing, thus reducing the problem of increased processing defect rate caused by product warping. The two pressing parts 800 are arranged opposite each other outside the cylinder chamber. While the two pressing parts 800 jointly press the product and prevent it from warping, they can avoid the processing position of the product's viewing window hole, thus facilitating the normal processing of the product's viewing window hole. Furthermore, this solution utilizes the pneumatic drive principle of cylinders. A dual-piston structure is installed within the cylinder chamber, with different air passage interfaces controlling the corresponding air chambers. This drives the two pistons to reciprocate, simultaneously controlling the radial horizontal movement and vertical up-and-down movement of the inner support pressing clamp. Utilizing the cylinder principle, through sliding engagement and multi-directional limiting, the coordinated operation of the inner support and pressing clamping actions is achieved without affecting their individual clamping forces, resulting in more reliable product clamping. The two pistons share the same intermediate air chamber 120, requiring only three air chambers and corresponding air passage interfaces to simultaneously control the radial horizontal movement and vertical up-and-down movement. This reduces the overall height of the clamp, simplifies the air passages and pipelines, saves clamp space, and makes the clamp more compact.

[0032] The cylinder 100 includes a cylinder body 170, a main body 180 located above and fixedly connected to the cylinder body 170, and a cylinder sealing disc 190 located below and sealed to the cylinder body 170. The cylinder body 170 and the main body 180 are connected by screws or integrally formed. In this embodiment, after the cylinder body 170 and the main body 180 are positioned by pins, they are connected by cup-head screws, and a sealing ring is provided at the mating part of the two. In other embodiments, the cylinder body 170 and the main body 180 can be integrally formed. Further, the bottom opening of the cylinder body 170 is a stepped hole, and the shape of the annular side of the cylinder sealing disc 190 is adapted to the shape of the stepped hole, so as to quickly position the cylinder sealing disc 190 during installation. An O-ring 191 is provided at the mating part of the cylinder sealing disc 190 and the inner wall of the cylinder body 170 to prevent air leakage at the connection part of the cylinder sealing disc 190 and the cylinder body 170. The top of the cylinder 170 is provided with a top plate 171 that is sealed and fixedly connected to the inner wall of the cylinder 170. The main body 180 is provided with a partition plate 183 that is sealed and fixedly connected to the inner wall of the main body 180 to separate the inner cavity of the main body 180, forming an upper groove 181 and a lower groove 182. It can be understood that the main body 180 and the partition plate 183 together form an upper and lower partition structure with an H-shaped vertical cross section. A first through hole 172 is opened on the top plate 171, and a second through hole 184 is opened on the partition plate 183. That is to say, the upper groove 181, the lower groove 182, and the inner cavity of the cylinder 170 are connected through the first through hole 172 and the second through hole 184. The cylinder sealing disc 190 has a third through hole 192 for sliding sealing through the piston rod 400. The inner wall of the third through hole 192 has an annular sealing groove 193. The annular sealing groove 193 has a cylinder dustproof ring 194. Through the elastic contact between the cylinder dustproof ring 194 and the side of the piston rod 400, air leakage can be prevented at the sliding contact part between the piston rod 400 and the third through hole 192 when the piston rod 400 is driven to rise and fall under the action of the first piston 300, so as to ensure the stability of the air pressure in the cylinder chamber. In this embodiment, the first piston 300 is housed within the cylinder 170 and forms a lower air chamber 130 with the cylinder sealing disc 190. The second piston 500 is located within the lower groove 182 and forms an intermediate air chamber 120 together with the first piston 300. The partition plate 183 and the second piston 500 together form an upper air chamber 110. By venting or venting air into the intermediate air chamber 120, the air pressure in the intermediate air chamber 120 can be controlled, thereby pushing the first piston 300 and the second piston 500 to move, so as to dynamically adjust the height of the upper air chamber 110, the intermediate air chamber 120, and the lower air chamber 130, thereby achieving the purpose of driving the piston rod 400 and the wedge head support rod 600 to rise and fall synchronously in opposite directions. When the main body 180 and the cylinder 170 adopt a split structure, corresponding notches can be opened at the top of the cylinder 170 and the bottom of the main body 180, and the two notches together form the connection part of the second air pipe connector 150.

[0033] The upper part of the main body 180 has a plurality of guide grooves 185 arranged around the upper groove 181 and corresponding to each inner support clamp 700 for sliding insertion. The guide grooves 185 extend radially along the main body 180 and communicate with the upper groove 181. The lower part of the wedge head support rod 600 slides through the second through hole 184 and is fixedly connected to the second piston 500. The upper part of the wedge head support rod 600 is located in the upper groove 181. In this embodiment, in the height direction of the cylinder 100, the groove width at the top of the guide groove 185 is at least smaller than the groove width of its adjacent part, so that a step is formed in the guide groove 185 to limit the inner support clamp 700, preventing the inner support clamp 700 from falling off the top of the cylinder 100 (the upper part of the main body 180) in the height direction of the cylinder 100, preventing the wedge head support rod from driving the inner support clamp 700 away from the main body 180 during the lifting process, and ensuring the reliability of driving the inner support clamp 700. Preferably, the cross-section of the guide groove 185 is an inverted T-shaped structure, and the outer contour shape of the lower part of the inner support block 700 is adapted to the inner contour shape of the guide groove 185. In addition, in this embodiment, the lower part of the wedge-head support rod 600 is a support rod, and the upper part is a wedge. The support rod slides through the second through hole 184, which has an annular groove. A sealing ring is embedded in the annular groove. Through the elastic contact between the sealing ring and the support rod, the mating part between the support rod and the second through hole 184 is sealed to prevent air leakage from the upper air chamber 110. The support rod passes through the second piston 500 and is fixedly connected to the second piston 500 by a fixing nut 610 threaded onto the support rod and located below the second piston 500. The upper surface of the fixing nut 610 abuts against the lower surface of the second piston 500. Furthermore, the maximum width of the fixing nut 610 is less than the inner diameter of the first through hole 172, and the upper surface of the first piston 300 is provided with a corresponding clearance groove 310 for the fixing nut 610. The width of the clearance groove 310 is greater than or equal to the maximum width of the fixing nut 610. Thus, during the process of air pressure change in the intermediate air chamber 120, the fixing nut 610 can enter the first through hole 172 under the drive of the second piston 500, so as to expand the lifting range of the wedge head support rod 600.

[0034] In one embodiment, the product placement block 200 has a central protrusion to form a product receiving area 210, which extends into the back cover of the watch when receiving it. Preferably, the height of the product receiving area 210 is greater than the height of the product, so that when the product receiving area 210 lifts the product, the lower surface of the product moves away from the upper surface of the outer area of ​​the product receiving area 210, allowing the top of the inner support clamping block 700 to extend into the inside of the product. In this embodiment, the upper parts of the product placement block 200 and the inner support clamping block 700 together form a tooling assembly for clamping the product. On the product placement block 200, a clearance hole 220 is provided on each of the two opposite sides of the product receiving area 210. The clearance hole 220 penetrates the upper and lower surfaces of the product placement block 200. Multiple clearance notches 230 are provided on the product placement block 200, corresponding to and connecting each guide groove 185. These clearance notches 230 provide a passageway for the upper part of the inner support clamping block 700, ensuring that the inner support clamping block 700 slides smoothly under the drive of the wedge head support rod 600. In this embodiment, the product placement block 200 is fixed to the upper surface of the main body 180 of the cylinder 100 by screws or bolts. There are four clearance notches 230, four guide grooves 185, and four inner support clamping blocks 700, and their positions correspond one-to-one. The four clearance notches 230 on the main body 180 are evenly arranged along the circumference of the main body 180 to ensure that the inner wall of the product is evenly stressed under the pressure of the inner support clamping block 700.

[0035] Furthermore, the cylinder barrel 100 has two guide holes 101 on the outer side of the cylinder chamber, which are opposite to and correspond one-to-one with the two clearance holes 220. That is, the cylinder body 170 and the main body 180 have corresponding through guide holes 101 on both opposite sides. The guide holes 101 penetrate the upper and lower surfaces of the cylinder barrel 100; the pressing member 800 includes a pressing claw shaft 810 that passes through the clearance hole 220 and the guide hole 101 and is fixedly connected to the piston rod 400, a pressing claw 820 that is fixed to the top of the pressing claw shaft 810 and protrudes towards the product placement block 200 to form a pressing part, and a flexible protective block 830 that is fixed to the lower surface of the pressing claw 820. In this embodiment, by providing a guide hole 101 on the cylinder 100 and a clearance hole 220 on the product placement block 200, a passage for the pressure claw shaft 810 is provided, thus limiting the lifting path of the pressure claw shaft 810. This prevents the pressure claw shaft 810 from wobbling during the lifting and lowering process following the piston rod 400, ensuring the precise pressing of the product by the pressure claw 820. By setting two pressing members 800 driven by the piston rod 400 and making the pressure claw shaft 810 of the pressing member 800 slide in cooperation with the corresponding hole, the pressing of the product adopts a dual-axis limited linear sliding, ensuring the accuracy and reliability of the movement. Of course, in other embodiments, if the length of the entire pressure claw shaft 810 is short and the diameter is large, its wobbling during the lifting and lowering process is minimal. In this case, the clearance hole 220 on the product placement block 200 and the guide hole 101 on the cylinder 100 can be omitted, and the pressure claw shaft 810 can be placed on the outside of the cylinder 100 to prevent interference between the pressure claw shaft 810 and the cylinder 100.

[0036] In this embodiment, the pressing component 800 has an overall inverted L-shaped or "7"-shaped structure. The pressing claw 820 and the pressing claw shaft 810 are fixedly connected by screws. The flexible protective block 830 is locked to the lower surface of the pressing claw 820 by screws, or a groove is opened on the lower surface of the pressing claw 820, and the flexible protective block 830 is embedded in the groove. The projection of the pressing claw 820 on the horizontal plane has a U-shaped structure, which can avoid the corresponding holes to be processed on the product while pressing the product. Preferably, the flexible protective block 830 is a urethane pressing block. The shape of the lower surface of the urethane pressing block is adapted to the shape of the upper surface of the product, so that the pressing claw 820 can fit more closely when pressing the irregular surface of the product, preventing the product from loosening and avoiding scratches. Preferably, the lower surface of the urethane pressing block is curved.

[0037] In one embodiment, the internal support pressing clamp further includes a pressing claw plate 840 located below the cylinder 100 and fixedly connected to the piston rod 400. The pressing claw shafts 810 of the two pressing members 800 are respectively fixedly connected to the pressing claw plate 840. Further, the pressing claw shafts 810 are fixed to the pressing claw plate 840 by cup-head screws. The upper surface of the pressing claw plate 840 is provided with a first limiting groove 841 and two second limiting grooves 842 oppositely arranged on both sides of the first limiting groove 841. The bottom of the piston rod 400 is inserted into the first limiting groove 841 and fixedly connected to the pressing claw plate 840 by cup-head screws penetrating the lower surface of the pressing claw plate 840. The bottom of the pressing claw shaft 810 is inserted into the second limiting grooves 842 and fixedly connected to the pressing claw plate 840 by cup-head screws penetrating the lower surface of the pressing claw plate 840. Preferably, the lower sidewall of the piston rod 400 is provided with a first flat portion, and a first vertical limiting surface that mates with the first flat portion is provided in the first limiting groove 841. The lower sidewall of the pressure claw shaft 810 is provided with a second flat portion, and a second vertical limiting surface that mates with the second flat portion is provided in the second limiting groove 842. In this way, the piston rod 400 and the pressure claw shaft 810 are connected by the pressure claw plate 840, which facilitates the synchronous lifting and lowering of the pressure claw 820 with the piston rod 400 under the drive of the pressure claw shaft 810, thereby driving the pressure claw 820 to press or release the product.

[0038] The wedge head strut 600, in cooperation with the inner support clamp 700, drives the inner support clamp 700 to move horizontally, so that the inner support clamp 700 presses against or releases the inner wall of the product. In this embodiment, the upper (wedge) ring side of the wedge head support rod 600 is provided with a plurality of T-shaped inclined bosses or T-shaped inclined grooves 620 distributed around the central axis of the wedge head support rod 600 and corresponding one-to-one with each inner support clamping block 700. The T-shaped inclined bosses or T-shaped inclined grooves 620 extend obliquely, and the T-shaped inclined bosses or T-shaped inclined grooves 620 gradually move away from the center of the wedge head support rod 600 from top to bottom. The inner support clamping block 700 includes a slider 710 and a support block 720 fixed on the top of the slider 710 for pressing the product. The shape of one side of the slider 710 adjacent to the wedge head support rod 600 is adapted to the shape of the T-shaped inclined bosses or T-shaped inclined grooves 620, and the slider 710 slides in cooperation with the T-shaped inclined bosses or T-shaped inclined grooves 620. In other words, the wedge head has a generally upright frustum-shaped structure. When multiple T-shaped beveled protrusions are provided on the circumferential side of the wedge head, a T-shaped beveled groove adapted to the shape of the T-shaped beveled protrusion is provided on the side of the slider 710 adjacent to the wedge head. Similarly, when multiple T-shaped beveled grooves are provided on the circumferential side of the wedge head, a T-shaped beveled protrusion adapted to the shape of the T-shaped beveled protrusion is provided on the side of the slider 710 adjacent to the wedge head. Thus, through the sliding fit between the T-shaped beveled protrusion and the T-shaped beveled groove, and the limiting constraint of the groove edge, the slider... While sliding up and down relative to the wedge head, the slider 710 can restrict the horizontal position of the slider 710 relative to the wedge head, so that the slider 710 and the wedge head always remain in contact. Thus, during the lifting and lowering of the wedge head slide rod, under the mutual constraint of the inclined surface of the T-shaped inclined boss and the inclined surface of the T-shaped inclined groove, the inner support clamp 700 always follows the lifting and lowering action of the wedge head support rod 600 and slides radially along the cylinder 100 to adjust the distance of the support block 720 relative to the inner wall of the product in the horizontal direction, thereby achieving the purpose of pressing or releasing the product.

[0039] In this embodiment, the support block 720 is fixed to the top of the slider 710 by a cup-head screw. The support block 720 has an L-shaped structure, including a horizontal part fixedly connected to the top of the slider 710, and a vertical part located on the horizontal part near the product end and perpendicularly connected to the horizontal part. It should be noted that in this embodiment, placing the vertical part on the horizontal part near the product end can avoid interference between the support block 720 and the product receiving area 210 during movement, and facilitates adjusting the distance between the vertical part of the support block 720 and the inner wall of the product to press or release the product.

[0040] The mounting base 900 is used to connect with the turntable 10. The mounting base 900 has a vertically arranged disc-shaped structure and four evenly spaced connection holes 910 for connecting with the turntable 10. That is, the mounting base 900 is a four-axis base. In one embodiment, the outer ring side of the cylinder 170 extends outward to form a mounting part that is fixedly connected to the mounting base 900. It can be understood that the cylinder 170 itself constitutes a plate bridge 920. The middle part of the plate bridge 920 has a cavity that penetrates its upper and lower surfaces. This cavity constitutes the inner cavity of the cylinder 170. The top plate 171 is sealed and fixed at the upper opening of the cavity of the plate bridge 920. The first piston 300, the second piston 500, the fixing bolts, etc. are all housed in the cavity of the plate bridge 920. One end face of the plate bridge 920 is screwed to the mounting base 900 and further fixed to the turntable 10 by the mounting base 900 to realize the installation of the entire inner support pressing clamp on the turntable 10. In another embodiment, a plate bridge 920 extending toward the cylinder 170 is fixed on the mounting base 900. The plate bridge 920 has mounting holes that penetrate its upper and lower surfaces. The cylinder 170 passes through the mounting holes and is fixedly connected to the plate bridge 920. For example, flanges are fixedly installed at the top and bottom ends of the cylinder 170, and the cylinder 170 and the plate bridge 920 are fixedly connected by screws to the flanges.

[0041] During the assembly of the internal support pressing fixture, firstly, sealing rings are installed at the corresponding positions on the second through hole 184 of the partition plate 183 inside the main body 180 and on the second piston 500. Four sets of sliders 710 are installed along the guide groove 185 of the main body 180. Then, wedge head support rods are assembled according to the T-shaped inclined bosses or T-shaped inclined grooves 620 on the sliders 710, so that the middle part of the wedge head support rod passes through the second through hole 184 and the middle through hole of the second piston 500. Finally, the second piston 500 and the wedge head support rod 600 are fixedly assembled with fixing nuts 610. The product placement block 200 is fixed to the upper surface of the main body 180 with cup head screws, and the four support blocks 720 are fixed one by one on each slider 710. The bottom of the support block 720 is provided with a boss that mates with the groove on the top of the slider 710. The support block 720 is fixed to the slider 710 with cup head screws. Finally, the first air pipe connector 140 is installed on the side of the main body 180.

[0042] Install a sealing ring in the first through hole 172 of the top plate 171 of the upper part of the cylinder 170 (or bridge plate), install the assembled main body 180 part on the cylinder 170 by screws, and fix the cylinder 170 or bridge plate 920 to the mounting base 900.

[0043] Insert the piston rod 400 into the cylinder 170, and fit the cylinder seal plate 190 onto the piston rod 400. Corresponding sealing rings are provided on the third through hole 192 and the outer ring surface of the cylinder seal plate 190. Then, the cylinder seal plate 190 is fitted into the bottom of the cylinder 170. Install pressure claw shafts 810 on both sides of the pressure claw plate 840, and allow the pressure claw shafts 810 to pass through the corresponding guide through holes 101 and clearance holes 220, so that the bottom of the piston rod 400 is embedded in the pressure claw plate 840 and fixed with screws. Finally, fix the flexible protective block 830 to the lower surface of the pressure claw plate 840.

[0044] 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.

[0045] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An inner support pressing fixture for machining holes in watch case back covers, characterized in that, It includes a cylinder with a cylinder chamber, a product placement block fixed to the top of the cylinder and used to support the products to be processed, a first piston and piston rod housed in the cylinder chamber, a second piston, a wedge head support rod, multiple inner support clamps, and two pressing parts; The first piston is located below the second piston and together with the second piston, they divide the cylinder chamber to form an upper chamber, an intermediate chamber, and a lower chamber from top to bottom. One end of the piston rod is fixedly connected to the first piston, and the other end of the piston rod extends from the bottom of the cylinder and slides and seals with the cylinder. When air enters the intermediate chamber, the first piston and the second piston move in the opposite direction to the intermediate chamber, respectively. The lower part of the wedge head strut slides and seals into the upper chamber along the height of the cylinder and is fixedly connected to the second piston. Multiple inner support clamps are located above the upper air chamber and arranged around the wedge head support rod. The inner support clamps are slidably connected to the cylinder along the cylinder radial direction. The inner support clamps are in contact with the upper inclined surface of the wedge head support rod and are limited to the upper part of the wedge head support rod along the cylinder radial direction. When the wedge head support rod moves upward, the inner support clamps slide along the cylinder radial direction to clamp the inner wall of the product. Two pressing components are arranged opposite each other on the outer side of the cylinder chamber. The pressing components are arranged along the height direction of the cylinder and fixedly connected to the piston rod. The top of the pressing component has a pressing part located above the product placement block. The pressing component descends when the piston rod moves down so that the pressing part presses the product.

2. The internal support pressing clamp according to claim 1, characterized in that, The cylinder includes a cylinder body, a main body located above the cylinder body and fixedly connected to the cylinder body, and a cylinder sealing plate located below the cylinder body and sealed to the cylinder body. The top of the cylinder body is provided with a top plate that is sealed and fixedly connected to the inner wall of the cylinder body. The main body is provided with a partition plate that is sealed and fixedly connected to the inner wall of the main body to separate the inner cavity of the main body into an upper groove and a lower groove. A first through hole is provided on the top plate, a second through hole is provided on the partition plate, and a third through hole is provided on the cylinder sealing plate for sliding and sealingly connecting the piston rod. The first piston is housed in the cylinder body and forms a lower air chamber with the cylinder sealing plate. The second piston is located in the lower groove and forms an intermediate air chamber together with the first piston. The partition plate and the second piston form an upper air chamber together. The upper part of the main body is provided with multiple guide grooves arranged around the upper groove and corresponding to each inner support clamping block for sliding insertion. The guide grooves extend radially along the main body and communicate with the upper groove. The lower part of the wedge head support rod slides and seals through the second through hole and is fixedly connected to the second piston. The upper part of the wedge head support rod is located in the upper groove.

3. The internal support pressing clamp according to claim 2, characterized in that, The width of the top of the guide groove is at least less than the width of the groove of the adjacent part.

4. The internal support pressing clamp according to claim 2, characterized in that, The cylinder body is screwed to the main body or integrally formed; the inner support pressing clamp also includes a mounting base for connecting with the turntable, the outer ring side of the cylinder body extends outward to form a mounting part fixedly connected to the mounting base; or the mounting base is fixed with a plate bridge extending towards the cylinder body, the plate bridge is provided with mounting holes penetrating its upper and lower surfaces, the cylinder body passes through the mounting holes and is fixedly connected to the plate bridge.

5. The internal support pressing clamp according to claim 2, characterized in that, The product placement block has a central protrusion to form a product receiving area. A clearance hole is provided on each of the two opposite sides of the product receiving area on the product placement block. The clearance hole penetrates the upper and lower surfaces of the product placement block. Multiple clearance notches are provided on the product placement block that correspond to and connect to each guide groove.

6. The internal support pressing clamp according to claim 5, characterized in that, The cylinder barrel has two guide holes on the outer side of the cylinder chamber, which are opposite to each other and correspond to two clearance holes. The guide holes penetrate the upper and lower surfaces of the cylinder barrel. The pressing component includes a pressing claw shaft that passes through the clearance hole and the guide hole and is fixedly connected to the piston rod, a pressing claw fixed on the top of the pressing claw shaft and protruding towards the product placement block to form the pressing part, and a flexible protective block fixed on the lower surface of the pressing claw.

7. The internal support pressing clamp according to claim 6, characterized in that, It also includes a pressure claw plate located below the cylinder and fixedly connected to the piston rod, with the pressure claw shafts of the two pressing parts fixedly connected to the pressure claw plate respectively.

8. The internal support pressing clamp according to claim 6, characterized in that, The upper circumferential side of the wedge-head support rod is provided with a plurality of T-shaped inclined bosses or T-shaped inclined grooves distributed around the central axis of the wedge-head support rod and corresponding one-to-one with each inner support clamping block. The T-shaped inclined bosses or T-shaped inclined grooves extend obliquely and gradually move away from the center of the wedge-head support rod from top to bottom. The inner support clamping block includes a slider and a support block fixed on the top of the slider for pressing the product. The shape of one side of the slider adjacent to the wedge-head support rod is adapted to the shape of the T-shaped inclined bosses or T-shaped inclined grooves, and the slider slides in cooperation with the T-shaped inclined bosses or T-shaped inclined grooves.

9. The internal support pressing clamp according to claim 8, characterized in that, The support block has an L-shaped structure, including a horizontal part fixedly connected to the top of the slider, and a vertical part located on the horizontal part adjacent to the product end and perpendicularly connected to the horizontal part.

10. The internal support pressing clamp according to claim 1, characterized in that, The outer ring side of the cylinder is provided with a first air pipe connector, a second air pipe connector and a third air pipe connector arranged sequentially from top to bottom. The first air pipe connector is connected to the upper air chamber, the second air pipe connector is connected to the middle air chamber and the third air pipe connector is connected to the lower air chamber.

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