A quick clamp

Abstract

The present application relates to a quick fixture, comprising a platform, a plurality of mounting cavities arranged in a matrix are formed on the top surface of the platform, a cylinder is arranged in each mounting cavity, a piston is sealingly and slidably arranged in the cylinder, a through hole is formed on the top surface of the cylinder, a guide cylinder is connected to the through hole and located in the cylinder, a guide groove is formed on the top surface of the piston, the guide cylinder is sealingly and slidably arranged in the guide groove, each cylinder is connected to a pressure system, and at least one clamping mechanism is detachably connected to the top end of any cylinder, the driving end of the clamping mechanism passes through the through hole and the inner hole of the guide cylinder in sequence and is detachably connected to the piston; the pressure system drives the piston to slide through a pressure medium, and the piston drives the clamping mechanism to clamp and fix a workpiece on the top surface of the platform; the quick fixture has wide applicability and can quickly and stably clamp a workpiece.

Description

Technical Field

[0001] This invention relates to the field of clamping technology, and more specifically to a quick clamp. Background Technology

[0002] When machining workpieces, clamping plates are often used to press and fix the workpieces onto the worktable of the machining equipment. This clamping method has the following disadvantages: 1. The clamping process is cumbersome, time-consuming, and labor-intensive. 2. The clamping force on the workpiece is difficult to control, the workpiece clamping is not stable, and it may slip out during machining. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a quick clamp that is widely applicable and can quickly and securely clamp workpieces.

[0004] To solve the above-mentioned technical problems, the present invention provides a quick clamp, including a platform, on the top surface of which are provided a plurality of mounting cavities arranged in a matrix, a cylinder is provided in the mounting cavity, a piston is slidably fitted in the cylinder, a through hole is provided on the top surface of the cylinder, a guide cylinder located in the cylinder is connected to the through hole, a guide groove is provided on the top surface of the piston, and the guide cylinder is slidably fitted in the guide groove, each cylinder is connected to a pressure system, and includes at least one clamping mechanism, which can be detachably connected to the top of any cylinder, the driving end of the clamping mechanism passes through the through hole and the inner hole of the guide cylinder in sequence and is detachably connected to the piston;

[0005] The pressure system drives the piston to slide through a pressure medium, and the piston drives the clamping mechanism to clamp and fix the workpiece on the top surface of the platform.

[0006] In a further preferred embodiment, a first spring is provided between the inner bottom surface of the cylinder and the piston. The piston divides the inner cavity of the cylinder into an upper chamber and a lower chamber. A medium inlet is provided on the side wall of the cylinder, which is suitable for connecting to the pressure system. A vent is provided on the side wall of the cylinder, which is suitable for connecting the lower chamber to the atmosphere. During operation, the pressure medium of the pressure system enters the upper chamber through the medium inlet, and the pressure medium drives the piston to slide downward. When the pressure system is unloaded, the first spring drives the piston to slide upward. This realizes the up-and-down sliding of the piston, which can drive the clamping mechanism to clamp or release the workpiece.

[0007] In a further preferred embodiment, a medium channel is formed on the inner wall of the mounting cavity, and the pressure system is connected to the medium inlet through the medium channel. A shut-off structure is provided on the medium channel, which is suitable for controlling the on / off of the pressure medium in the medium channel. Since the shut-off structure can control the on / off of the pressure medium in the medium channel, the cylinder connected to the clamping mechanism can be connected to the pressure system through the medium channel, while the cylinder without the clamping mechanism is not connected to the pressure system, thus effectively reducing the load on the pressure system.

[0008] In a further preferred embodiment, the shut-off structure includes a first countersunk hole on the top surface of the platform, a second countersunk hole on the inner bottom surface of the first countersunk hole, a medium channel including a first channel on the inner wall of the mounting cavity, the first channel connecting the medium inlet and the first countersunk hole, a second channel on the inner wall of the second countersunk hole, the pressure system being connected to the second countersunk hole through the second channel, a second spring being provided in the second countersunk hole, an adjusting screw being threaded into the first countersunk hole, and a first ball bearing located in the first countersunk hole being provided between the adjusting screw and the second spring;

[0009] During operation, the position and height of the first ball can be controlled by adjusting the adjusting screw. When the first ball abuts against the upper port of the second countersunk hole, the first countersunk hole and the second countersunk hole are not connected. When the first ball moves upward and forms an opening between it and the upper port of the second countersunk hole, the opening connects the first countersunk hole and the second countersunk hole.

[0010] In a further preferred embodiment, the clamping mechanism includes an annular base that can be detachably connected to the top of any cylinder. A drive rod is slidably fitted in the central through hole of the base. A clamping structure is provided on the base. The top of the drive rod is connected to the clamping structure, and the bottom of the drive rod passes through the through hole and the inner hole of the guide cylinder in sequence and is detachably connected to the piston.

[0011] In a further preferred embodiment, the top surface of the cylinder body has a groove with a through hole, and the inner wall of the groove has an annular fastening groove. The bottom of the base fits into the groove, and the bottom surface of the base has an installation groove with a central through hole. A rotating ring is fitted onto the drive rod and located in the installation groove. A lever is provided on the outer side of the rotating ring. An oblong hole is provided on the inner wall of the installation groove. The outer end of the lever passes through the oblong hole and extends out of the base. The lever can swing along the length of the oblong hole. A return spring is provided between one end of the oblong hole and the lever in the length direction. A plurality of circumferentially distributed first ball holes are provided on the inner wall of the installation groove. Second balls slide in the first ball holes. The outer side of the rotating ring has a relief groove with the same number and corresponding position as the second balls.

[0012] The rotating ring has two rotational positions. In the first rotational position, the outer surface of the rotating ring contacts the second ball, and the outer end of the second ball engages in the engagement groove. The clamping mechanism is snapped into the cylinder body. The return spring keeps the rotating ring in the first rotational position. Overcoming the tension of the return spring, the lever is moved to move the rotating ring into the second rotational position. The second ball disengages from the engagement groove, and its inner end enters the relief groove. The clamping mechanism can then be separated from the cylinder body. The clamping mechanism can quickly connect to or separate from the cylinder body.

[0013] A further preferred embodiment includes multiple positioning blocks, which can be fixed to the top of any cylinder by screws. The screws are threaded into the guide cylinder. In use, the multiple positioning blocks are distributed on adjacent sides of the workpiece. When processing workpieces in large batches, the workpieces can be quickly positioned by the positioning blocks.

[0014] The clamping structure includes a pair of rockers movably connected to the left and right sides of the base, respectively. A connecting rod is movably connected to the end of each rocker away from the base. The ends of the connecting rods on the left and right sides, away from the rockers, are movably connected to the top of a drive rod. A pressure frame is provided between the tops of the left and right connecting rods. In use, when the drive rod moves downward, the front end of the pressure frame presses against the top surface of the workpiece, and the clamping structure completes the clamping action. When the drive rod moves upward, the front end of the pressure frame releases the workpiece. The clamping structure can clamp and fix block-shaped or thin-walled annular workpieces onto the top surface of the platform.

[0015] The clamping structure includes a pair of racks slidably disposed on the left and right sides of the base, with the tooth surfaces of the racks facing upwards. A strip-shaped pressure block is provided between the front ends of the left and right racks. A swing arm is movably connected to the left and right sides of the top of the drive rod. A toothed block with its tooth surface facing downwards is movably connected to the end of the swing arm away from the drive rod. The toothed blocks on the left and right sides mesh with the left and right racks respectively. A pull rod is provided between the ends of the left and right swing arms away from the drive rod, and a tension spring is provided between the pull rod and the base. During operation, when the drive rod moves downwards, the strip-shaped pressure block slides forward and abuts against the outer side of the workpiece, and the clamping structure completes the clamping action. When the drive rod moves upwards, the strip-shaped pressure block slides backwards and releases the workpiece. Multiple opposing clamping structures can clamp and fix block-shaped or thin-walled annular workpieces on the top surface of the platform. The clamping structure can also cooperate with positioning blocks to clamp block-shaped or thin-walled annular workpieces.

[0016] A further preferred embodiment includes three triangularly distributed shims, the bottom of which can be threaded into any of the guide cylinders. In use, the workpiece is supported on the top surface of the shims; the shims allow for easy adjustment of the workpiece's height.

[0017] In a further preferred embodiment, the drive rod is tubular, with a guide rod slidably fitted inside. A third countersunk hole communicating with its inner hole is formed on the top surface of the drive rod. A top rod slidably fitted inside the third countersunk hole is provided at the top of the guide rod. A third spring is sleeved on the guide rod between the top rod and the bottom surface of the third countersunk hole. Multiple circumferentially distributed second ball bearing holes are formed on the side wall of the bottom of the drive rod, with third balls slidably fitted inside the second ball bearing holes. An annular relief groove with an arc-shaped cross-section is formed on the outer side surface of the bottom of the guide rod. A fourth countersunk hole is formed on the bottom surface of the guide groove, with an annular groove with an arc-shaped cross-section formed on the inner wall of the fourth countersunk hole.

[0018] The guide rod has two sliding position states. In the first sliding position state, the outer side of the guide rod contacts the third ball, and the outer end of the third ball engages in the annular groove. The drive rod and the piston are engaged. The third spring keeps the guide rod in the first sliding position state. Overcoming the spring force of the third spring, the top rod is pressed down, causing the guide rod to enter the second sliding position state. The third ball is disengaged from the annular groove, and its inner end enters the annular relief groove. The drive rod and the piston can then be separated.

[0019] The beneficial effects of this invention are as follows: In use, the installation position of the clamping mechanism is reasonably selected according to the shape and size of the workpiece, so that the clamping mechanism is detachably connected to the top of the cylinder. The driving end of the clamping mechanism passes through the through hole and the inner hole of the guide cylinder in sequence and is detachably connected to the piston. The pressure system drives the piston in the cylinder to slide through the pressure medium, which further drives the clamping mechanism to clamp and fix the workpiece on the top surface of the platform. The quick clamp can clamp workpieces of different shapes and sizes. Its driving element is the pressure system, which can drive all clamping mechanisms to move synchronously, so it can clamp and fix the workpiece more quickly and stably. The quick clamp of this invention has wide applicability and can clamp workpieces quickly and stably. Attached Figure Description

[0020] To clearly illustrate the innovative principles of the invention and its advantages over existing quick-clamping devices, possible embodiments are described below with the aid of accompanying drawings through non-limiting examples applying the principles. In the drawings:

[0021] Figure 1 This is a top view of the quick clamp of the present invention;

[0022] Figure 2 for Figure 1 Sectional view at AA;

[0023] Figure 3 for Figure 1 Sectional view at BB;

[0024] Figure 4 for Figure 2 A magnified view of section C;

[0025] Figure 5 for Figure 3 Enlarged view of a section at point D;

[0026] Figure 6 This is a front view of the clamping mechanism in its released state;

[0027] Figure 7 for Figure 6 Sectional view at EE;

[0028] Figure 8 for Figure 6 Sectional view at FF;

[0029] Figure 9 This is a front view of the clamping mechanism in its clamped state;

[0030] Figure 10 for Figure 9 A three-dimensional image;

[0031] Figure 11 This is a perspective view of the clamping mechanism;

[0032] Figure 12 This is a perspective view of the clamping mechanism;

[0033] Figure 13 for Figure 11 The main view;

[0034] Figure 14 for Figure 13 Sectional view at GG

[0035] Figure 15 A schematic diagram of the quick clamp for clamping a block-shaped workpiece;

[0036] Figure 16 A schematic diagram of the quick clamping fixture for clamping a ring-shaped workpiece;

[0037] Figure 17 A schematic diagram of the quick clamping fixture for clamping a ring-shaped workpiece;

[0038] Figure 18 This is a schematic diagram illustrating the use of the raised block. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this invention.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1

[0043] like Figure 1-5 The quick clamp of this embodiment includes a platform 1, on the top surface of which are provided a plurality of mounting cavities 2 arranged in a matrix. A cylinder 3 is provided in the mounting cavity 2. A piston 4 is slidably fitted in the cylinder 3. A through hole 47 is provided on the top surface of the cylinder 3. A guide cylinder 45 located in the cylinder 3 is connected to the through hole 47. A guide groove 46 is provided on the top surface of the piston 4. The guide cylinder 45 is slidably fitted in the guide groove 46. Each cylinder 3 is connected to a pressure system. It also includes at least one clamping mechanism 5. The clamping mechanism 5 can be detachably connected to the top of any cylinder 3. The driving end 6 of the clamping mechanism 5 passes through the through hole 47 and the inner hole of the guide cylinder 45 in sequence and is detachably connected to the piston 4.

[0044] The pressure system drives the piston 4 to slide through the pressure medium, and the piston 4 drives the clamping mechanism 5 to clamp and fix the workpiece 7 on the top surface of the platform 1.

[0045] Preferably, the pressure system is a hydraulic system, and the pressure medium is hydraulic oil. The hydraulic system has the characteristics of smooth transmission, large driving force, and fast response. The pressure system can also be a pneumatic system, and the pressure medium is compressed air.

[0046] Preferably, a first spring 8 is provided between the inner bottom surface of the cylinder 3 and the piston 4. The piston 4 divides the inner cavity of the cylinder 3 into an upper chamber 9 and a lower chamber 10. A medium inlet 11 is provided on the side wall of the cylinder 3 to connect to the upper chamber 9. The medium inlet 11 is suitable for connecting to the pressure system. A vent 12 is provided on the side wall of the cylinder 3 to connect to the lower chamber 10 and to connect the lower chamber 10 to the atmosphere. During operation, the pressure medium of the pressure system enters the upper chamber 9 through the medium inlet 11 and drives the piston 4 to slide downward. When the pressure system is unloaded, the first spring 8 drives the piston 4 to slide upward. This realizes the up-and-down sliding of the piston 4. The up-and-down sliding piston 4 can drive the clamping mechanism 5 to clamp or release the workpiece 7.

[0047] Preferably, a medium channel is provided on the inner wall of the mounting cavity 2, and the pressure system is connected to the medium inlet 11 through the medium channel. A shut-off structure 14 is provided on the medium channel, which is suitable for controlling the on and off of the pressure medium in the medium channel. Since the shut-off structure 14 can control the on and off of the pressure medium in the medium channel, the cylinder 3 connected to the clamping mechanism 5 can be connected to the pressure system through the medium channel, while the cylinder 3 not connected to the clamping mechanism 5 is not connected to the pressure system, thus effectively reducing the load on the pressure system.

[0048] Preferably, the shut-off structure 14 includes a first countersunk hole 15 formed on the top surface of the platform 1, a second countersunk hole 16 formed on the inner bottom surface of the first countersunk hole 15, the medium channel includes a first channel 17 formed on the inner wall of the mounting cavity 2, the first channel 17 connects the medium inlet 11 and the first countersunk hole 15, a second channel 18 is formed on the inner wall of the second countersunk hole 16, the pressure system is connected to the second countersunk hole 16 through the second channel 18, a second spring 19 is provided in the second countersunk hole 16, an adjusting screw 20 is threaded in the first countersunk hole 15, and a first ball bearing 21 located in the first countersunk hole 15 is provided between the adjusting screw 20 and the second spring 19.

[0049] During operation, the position and height of the first ball 21 can be controlled by adjusting the adjusting screw 20. When the first ball 21 abuts against the upper port of the second countersunk hole 16, the first countersunk hole 15 and the second countersunk hole 16 are not connected. When the first ball 21 moves upward and forms an opening between itself and the upper port of the second countersunk hole 16, the opening connects the first countersunk hole 15 and the second countersunk hole 16.

[0050] Preferred, such as Figure 6-8The clamping mechanism 5 includes an annular base 22, which can be detachably fastened to the top of any cylinder 3. A drive rod 24 is slidably fitted in the central through hole 23 of the base 22. A clamping structure 25 is provided on the base 22. The top of the drive rod 24 is connected to the clamping structure 25. The bottom of the drive rod 24 passes through the through hole 47 and the inner hole of the guide cylinder 45 in sequence and is connected to the piston 4 by a detachable fastener.

[0051] Preferably, the top surface of the cylinder body 3 has a groove 26 communicating with the through hole 47, and the inner wall of the groove 26 has an annular fastening groove 27. The bottom of the base 22 fits into the groove 26, and the bottom surface of the base 22 has a mounting groove 28 communicating with its central through hole 23. The drive rod 24 is fitted with a rotating ring 29 located in the mounting groove 28, and the outer surface of the rotating ring 29 is provided with a lever 30. The inner wall of the mounting groove 28 has an oblong hole 48. The outer end of the lever 30 passes through the waist-shaped hole 48 and extends out of the base 22. The lever 30 can swing along the length direction of the waist-shaped hole 48. A return spring 49 is provided between one end of the waist-shaped hole 48 and the lever 30 in the length direction. A plurality of circumferentially distributed first ball holes 31 are provided on the inner wall of the mounting groove 28. Second balls 32 are slidably fitted in the first ball holes 31. The outer surface of the rotating ring 29 is provided with a relief groove 33 that is the same number and corresponding in position as the second balls 32.

[0052] The rotating ring 29 has two rotational positions. In the first rotational position, the outer surface of the rotating ring 29 contacts the second ball 32, and the outer end of the second ball 32 engages in the engagement groove 27. The clamping mechanism 5 is snapped into the cylinder 3. The return spring 49 keeps the rotating ring 29 in the first rotational position. Overcoming the tension of the return spring 49, the lever 30 is moved to move the rotating ring 29 into the second rotational position. The second ball 32 is released from the engagement groove 27 and its inner end enters the relief groove 33. The clamping mechanism 5 can be separated from the cylinder 3. The clamping mechanism 5 can be quickly connected to or separated from the cylinder 3.

[0053] Preferred, such as Figure 1 It also includes multiple positioning blocks 34, which can be fixed to the top of any cylinder 3 by screws. The screws are threaded into the guide cylinder 45. In use, the multiple positioning blocks 34 are distributed on the adjacent sides of the workpiece 7. When processing workpieces in batches, the workpieces can be quickly positioned by the positioning blocks 34.

[0054] like Figure 9 , 1014. The clamping structure 25 includes a pair of rocker arms 35 movably connected to the left and right sides of the base 22, respectively. The end of the rocker arm 35 away from the base 22 is movably connected to a connecting rod 36. The ends of the left and right connecting rods 36 away from the rocker arms 35 are movably connected to the top of the drive rod 24, respectively. A pressure frame 37 is provided between the tops of the left and right connecting rods 36. In use, when the drive rod 24 moves down, the front end 60 of the pressure frame 37 presses against the top surface of the workpiece 7, and the clamping structure 25 completes the pressing action; when the drive rod 24 moves up, the front end 60 of the pressure frame 37 releases the workpiece 7. The clamping structure 25 can press and fix block-shaped or thin-walled annular workpieces on the top surface of the platform 1.

[0055] like Figure 11 , 12 13, 15, The clamping structure 25 includes a pair of racks 38 slidably disposed on the left and right sides of the base 22, respectively. The tooth surfaces of the racks 38 are facing upwards. A strip-shaped pressure block 39 is provided between the front ends of the left and right racks 38. A rocker arm 40 is movably connected to the left and right sides of the top of the drive rod 24, respectively. A toothed block 41 with its tooth surface facing downwards is movably connected to the end of the rocker arm 40 away from the drive rod 24. The left and right toothed blocks 41 mesh with the left and right racks 38 respectively. The ends of the left and right rocker arms 40 away from the drive rod 24 are connected to the racks 38 respectively. A pull rod 42 is provided, and a tension spring 43 is provided between the pull rod 42 and the base 22. During operation, when the drive rod 24 moves down, the strip-shaped pressure block 39 slides forward and abuts against the outer side of the workpiece 7, and the clamping structure 25 completes the clamping action. When the drive rod 24 moves up, the strip-shaped pressure block 39 slides backward and releases the workpiece 7. The multiple clamping structures 25 arranged opposite to each other can clamp and fix the block or thin-walled annular workpiece on the top surface of the platform 1. The clamping structure 25 can also cooperate with the positioning block 34 to clamp the block or thin-walled annular workpiece.

[0056] Preferred, such as Figure 16 It also includes three triangularly distributed shims 44. The bottom of each shim 44 can be threaded into any of the guide cylinders 45. In use, the workpiece 7 is supported on the top surface of the shim 44. The shims 44 can easily adjust the height of the workpiece 7.

[0057] Preferred, such as Figure 13-14The drive rod 24 is tubular, and a guide rod 61 is slidably fitted inside the drive rod 24. A third countersunk hole 62 communicating with its inner hole is opened on the top surface of the drive rod 24. A top rod 63 is slidably fitted inside the third countersunk hole 62 at the top end of the guide rod 61. A third spring 64 is sleeved on the guide rod 61 between the top rod 63 and the bottom surface of the third countersunk hole 62. A plurality of circumferentially distributed second ball holes 65 are opened on the side wall of the bottom of the drive rod 24. A third ball 66 is slidably fitted inside the second ball holes 65. An annular relief groove 67 is opened on the outer side surface of the bottom of the guide rod 61. The cross-section of the annular relief groove 67 is arc-shaped. A fourth countersunk hole 68 is opened on the bottom surface of the guide groove 46. An annular groove 69 is opened on the inner wall of the fourth countersunk hole 68. The cross-section of the annular groove 69 is arc-shaped.

[0058] The guide rod 61 has two sliding position states. In the first sliding position state, the outer side of the guide rod 61 contacts the third ball 66, and the outer end of the third ball 66 is engaged in the annular groove 69. The drive rod 24 is engaged with the piston 4, and the third spring 64 keeps the guide rod 61 in the first sliding position state. Overcoming the spring force of the third spring 64, the top rod 63 is pressed down, causing the guide rod 61 to enter the second sliding position state. The third ball 66 is unengaged from the annular groove 69, and its inner end enters the annular relief groove 67. The drive rod 24 and the piston 4 can then be separated.

[0059] In use, the installation position of the clamping mechanism 5 is reasonably selected according to the shape and size of the workpiece 7, so that the clamping mechanism 5 is detachably connected to the top of the cylinder 3. The driving end 6 of the clamping mechanism 5 passes through the through hole 47 and the inner hole of the guide cylinder 45 in sequence and is detachably connected to the piston 4. The pressure system drives the piston 4 in the cylinder 3 to slide through the pressure medium, and further drives the clamping mechanism 5 to clamp and fix the workpiece 7 on the top surface of the platform 1. The quick clamp can clamp workpieces 7 of different shapes and sizes. Its driving element is the pressure system. The pressure system can drive all clamping mechanisms 5 to move synchronously, so it can clamp and fix the workpiece 7 more quickly and stably. The quick clamp of this embodiment has wide applicability and can clamp workpieces quickly and stably.

[0060] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A quick clamp, comprising a platform (1), characterized in that: The platform (1) has multiple mounting cavities (2) arranged in a matrix on its top surface. Each mounting cavity (2) contains a cylinder (3). A piston (4) is slidably fitted inside the cylinder (3). A through hole (47) is provided on the top surface of the cylinder (3). A guide cylinder (45) located inside the cylinder (3) is connected to the through hole (47). A guide groove (46) is provided on the top surface of the piston (4). The guide cylinder (45) is slidably fitted inside the guide groove (46). Each cylinder (3) is connected to a pressure system. The platform also includes at least one clamping mechanism (5). The clamping mechanism (5) can be detachably connected to the top of any cylinder (3). The driving end (6) of the clamping mechanism (5) passes through the through hole (47) and the inner hole of the guide cylinder (45) in sequence and is detachably connected to the piston (4). During operation, the pressure system drives the piston (4) to slide through the pressure medium, and the piston (4) drives the clamping mechanism (5) to clamp and fix the workpiece (7) on the top surface of the platform (1); The clamping mechanism (5) includes an annular base (22), which is detachably connected to the top of any cylinder (3). A drive rod (24) is slidably fitted in the central through hole (23) of the base (22). A clamping structure (25) is provided on the base (22). The top of the drive rod (24) is connected to the clamping structure (25). The bottom of the drive rod (24) passes through the through hole (47) and the inner hole of the guide cylinder (45) in sequence and is detachably connected to the piston (4). The top surface of the cylinder (3) is provided with a groove (26) that connects to the through hole (47). The inner wall of the groove (26) is provided with an annular fastening groove (27). The bottom of the base (22) fits into the groove (26). The bottom surface of the base (22) is provided with a mounting groove (28) that connects to its central through hole (23). The drive rod (24) is fitted with a rotating ring (29) located in the mounting groove (28). The outer side of the rotating ring (29) is provided with a lever (30) that extends out of the base (22). The inner wall of the mounting groove (28) is provided with a plurality of circumferentially distributed first ball holes (31). The first ball holes (31) are slidably fitted with second balls (32). The outer side of the rotating ring (29) is provided with a relief groove (33) that is the same number and corresponding in position as the second balls (32). By moving the lever (30), the rotating ring (29) can be switched between two rotational positions. In the first rotational position, the outer side of the rotating ring (29) contacts the second ball (32), and the outer end of the second ball (32) is engaged in the engagement groove (27). In the second rotational position, the second ball (32) is disengaged from the engagement groove (27), and its inner end enters the relief groove (33).

2. The quick clamp according to claim 1, characterized in that: A first spring (8) is provided between the inner bottom surface of the cylinder (3) and the piston (4). The piston (4) divides the inner cavity of the cylinder (3) into an upper chamber (9) and a lower chamber (10). A medium inlet (11) is provided on the cylinder (3) to connect to the upper chamber (9). The medium inlet (11) is suitable for connecting to the pressure system. A vent (12) is provided on the cylinder (3) to connect to the lower chamber (10). The vent (12) is suitable for connecting the lower chamber (10) to the atmosphere.

3. The quick clamp according to claim 2, characterized in that: A medium channel is provided on the inner wall of the mounting cavity (2). The pressure system is connected to the medium inlet (11) through the medium channel. A shut-off structure (14) is provided on the medium channel. The shut-off structure (14) is suitable for controlling the opening and closing of the pressure medium in the medium channel.

4. The quick clamp according to claim 3, characterized in that: The shut-off structure (14) includes a first countersunk hole (15) on the top surface of the platform (1), and a second countersunk hole (16) on the inner bottom surface of the first countersunk hole (15). The medium channel includes a first channel (17) on the inner wall of the mounting cavity (2). The first channel (17) connects the medium inlet (11) and the first countersunk hole (15). A second channel (18) is provided on the inner wall of the second countersunk hole (16). The pressure system is connected to the second countersunk hole (16) through the second channel (18). A second spring (19) is provided in the second countersunk hole (16). An adjusting screw (20) is threaded in the first countersunk hole (15). A first ball (21) located in the first countersunk hole (15) is provided between the adjusting screw (20) and the second spring (19). During operation, the position height of the first ball (21) can be controlled by adjusting the adjusting screw (20). When the first ball (21) abuts against the upper port of the second countersunk hole (16), the first countersunk hole (15) and the second countersunk hole (16) are not connected. When the first ball (21) moves upward and forms an opening between itself and the upper port of the second countersunk hole (16), the opening connects the first countersunk hole (15) and the second countersunk hole (16).

5. The quick clamp according to claim 1, characterized in that: The quick clamp also includes multiple positioning blocks (34), which can be detachably connected to the top of any cylinder (3). In use, the multiple positioning blocks (34) are distributed on adjacent sides of the workpiece (7).

6. The quick clamp according to claim 1, characterized in that: The clamping structure (25) includes a pair of rockers (35) that are movably connected to the left and right sides of the base (22). The end of the rocker (35) away from the base (22) is movably connected to a connecting rod (36). The ends of the connecting rods (36) on the left and right sides away from the rockers (35) are movably connected to the top of the drive rod (24). A pressure frame (37) is provided between the tops of the connecting rods (36) on the left and right sides. When in use, the front end (60) of the pressure frame (37) is pressed against the top surface of the workpiece (7).

7. The quick clamp according to claim 1, characterized in that: The clamping structure (25) includes a pair of racks (38) that are slidably disposed on the left and right sides of the base (22). The tooth surfaces of the racks (38) are facing upwards. A strip-shaped pressure block (39) is provided between the front ends of the left and right racks (38). A rocker arm (40) is movably connected to the left and right sides of the top of the drive rod (24). A tooth block (41) with its tooth surface facing downwards is movably connected to the end of the rocker arm (40) away from the drive rod (24). The tooth blocks (41) on the left and right sides mesh with the racks (38) on the left and right sides respectively.

8. The quick clamp according to claim 1, characterized in that: The drive rod (24) is tubular, and a guide rod (61) is slidably fitted inside the drive rod (24). Multiple circumferentially distributed second ball holes (65) are opened on the side wall of the bottom of the drive rod (24). A third ball (66) is slidably fitted inside the second ball hole (65). An annular relief groove (67) is opened on the outer side surface of the bottom of the guide rod (61). A fourth countersunk hole (68) is opened on the bottom surface of the guide groove (46). An annular groove (69) is opened on the inner wall of the fourth countersunk hole (68). The guide rod (61) has two sliding position states. In the first sliding position state, the outer side of the guide rod (61) contacts the third ball (66), and the outer end of the third ball (66) is engaged in the annular groove (69). In the second sliding position state, the third ball (66) is disengaged from the annular groove (69), and its inner end enters the annular relief groove (67).

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