Clamp

Abstract

The utility model belongs to the technical field of fixing tools, and discloses a clamp which comprises a clamping table, a positioning mechanism and a pressing mechanism. A positioning hole is formed in the clamping table, a positioning cylinder of a clamped workpiece is inserted into the positioning hole, and a flange annularly arranged at the end of the positioning cylinder is erected on the table top of the clamping table. A plurality of positioning mechanisms are arranged in the circumferential direction of the inner wall of the positioning hole, each positioning mechanism comprises a first shell and a positioning piece, the first shells are fixedly arranged on the inner wall of the positioning hole, and the positioning pieces are arranged on the first shells in a telescopic mode in the radial direction of the positioning hole; a plurality of pressing mechanisms are arranged on the periphery of the flange, each pressing mechanism comprises a second shell and a pressing piece, the second shells are connected to the clamping table, and the pressing pieces can rotate around the vertical axis and are arranged on the second shells in a telescopic mode in the vertical direction. The clamping table can be used for inserting and erecting a workpiece, is suitable for workpieces of various structural forms, and is wide in application range; and the positioning mechanism and the pressing mechanism cooperate to fully clamp the workpiece, so that the workpiece is kept stable.

Description

Technical Field

[0001] The utility model relates to the technical field of fixed tooling, in particular to a clamp. Background Art

[0002] When processing workpieces of some mechanical products, special fixtures are usually used to clamp and fix the workpieces, so as to ensure the accurate positional relationship between the workpiece and the tool or machine tool, thereby ensuring the processing accuracy.

[0003] Existing fixtures usually include an operating platform plate, on which a clamping cylinder is provided. The workpiece is placed on the operating platform plate, and the clamping cylinder is used to clamp the upper surface of the workpiece, so that the workpiece is fixed on the operating platform plate for subsequent processing to ensure processing accuracy.

[0004] The above-mentioned clamp has the following defects: when the workpiece has protruding parts on its surface, it cannot be stably placed on the operating platform, and the clamping stability of the workpiece is poor. For example, a workpiece with a flange has protruding parts on both sides of its surface. It is placed on the operating platform, and the clamping cylinder is pressed on the flange of the workpiece to achieve clamping and fixing. The clamping of the workpiece is difficult and the clamping is not stable enough. During the processing of the workpiece, it is likely to shake, and it is difficult to accurately control the position of the workpiece to be processed, thereby affecting the precision of the workpiece, reducing the quality of the product, and the defective rate is high. Utility Model Content

[0005] The purpose of the utility model is to provide a clamp that can be used to clamp workpieces of various structural forms, has a wide range of applications, can improve the firmness of clamping the workpiece, prevent the workpiece from shaking, keep the workpiece stable, and improve processing accuracy and product quality.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A clamp is used to clamp a workpiece, the workpiece comprising a positioning tube and a flange arranged around the end of the positioning tube;

[0008] The fixture comprises:

[0009] A clamping platform, wherein a positioning hole is provided on the clamping platform, wherein the positioning hole is used for inserting the positioning cylinder, and the table surface of the clamping platform is used for setting up the flange;

[0010] A plurality of positioning mechanisms are arranged along the circumference of the inner wall of the positioning hole, the positioning mechanism comprises a first shell and a positioning member, the first shell is fixedly arranged on the inner wall of the positioning hole, and the positioning member is telescopically arranged on the first shell along the radial direction of the positioning hole to press against or release the positioning cylinder;

[0011] A plurality of clamping mechanisms are provided along the outer periphery of the flange; each of the clamping mechanisms comprises a second shell and a clamping member, the second shell is connected to the clamping platform, and the clamping member is rotatable around a vertical axis and is vertically telescopically arranged on the second shell.

[0012] Optionally, the second shell is fixedly connected to the clamping table, a first buffer pad is provided on the side of the clamping member facing the flange, a second buffer pad is provided on the table surface of the clamping table, and the distance between the rotation axis of the clamping member and the first buffer pad is equal to the distance between the rotation axis and the second buffer pad.

[0013] Optionally, the second shell is adjustably connected to the clamping platform along the radial position of the positioning hole.

[0014] Optionally, the clamp further includes a driving mechanism, which includes a third shell and an output end, the third shell is arranged on the clamping table, and the output end is transmission-connected with the second shell to drive the second shell to move radially along the positioning hole.

[0015] Optionally, the clamp further includes a guide rail mechanism, the guide rail mechanism is disposed on the clamping table, the guide rail mechanism extends radially along the positioning hole, and the second shell is slidably matched with the guide rail mechanism.

[0016] Optionally, a receiving groove is provided on the clamping table, the guide rail mechanism is arranged in the receiving groove, and the top surface of the guide rail mechanism is not higher than the table surface of the clamping table.

[0017] Optionally, the clamp further comprises a gasket assembly, wherein the gasket assembly comprises a stacked rigid layer and a flexible layer, wherein the rigid layer is detachably laid on the table surface of the clamping table, and the flexible layer is in contact with the flange.

[0018] Optionally, a third buffer pad is provided on a side of the positioning member facing the positioning tube, and the third buffer pad can contact the positioning tube.

[0019] Optionally, the plurality of positioning mechanisms are evenly distributed along the circumference of the positioning hole; and / or the plurality of clamping mechanisms are evenly distributed along the circumference of the positioning hole.

[0020] Optionally, the clamping mechanism is a rotary clamping cylinder.

[0021] Beneficial effects of the utility model:

[0022] The clamp proposed by the utility model, when clamping a workpiece, first rotates the clamping member of the clamping mechanism toward the outside of the clamping table to make room for the workpiece to be smoothly placed on the clamping table. When placing the workpiece, the positioning tube of the workpiece is inserted into the positioning hole, and the flange is placed on the table surface of the clamping table. Then, the positioning members of multiple positioning mechanisms are driven to extend radially along the positioning hole to press against the positioning tube so that the positioning tube is positioned; and, after rotating the clamping member of the clamping mechanism to just above the flange, the clamping member is driven to move downward to press the flange. At this time, the positioning tube and the flange are both firmly fixed, and the workpiece can be processed. When the processing is completed, the clamping member is driven to move upward and rotate toward the outside of the clamping table to release the flange of the workpiece; and, the positioning member of the positioning mechanism is driven to move radially along the positioning hole to release the positioning tube of the workpiece, so that the workpiece is removed from the clamping table. By opening a positioning hole on the clamping table, a positioning cylinder protruding downward from the workpiece can be inserted, so that the flange can be placed on the table of the clamping table, thereby stably clamping the workpiece, and a workpiece of a conventional plane shape can also be placed on the table of the clamping table and clamped; moreover, multiple positioning members can move radially along the positioning hole to clamp positioning cylinders of various diameters, and the clamp can be used to place and clamp workpieces of various structural forms and specifications, and has a wide range of applications. The positioning cylinder of the workpiece is tightly fixed by multiple positioning mechanisms, and the flange of the workpiece is pressed and fixed by multiple clamping mechanisms, so that the workpiece can be effectively prevented from moving up and down and moving radially during the processing process, and the workpiece can be prevented from shaking, so that it can remain stable, thereby accurately controlling the position of the workpiece to be processed, ensuring the precision of the workpiece processing, and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a clamp clamping a workpiece provided by an embodiment of the utility model;

[0024] Figure 2 is a top view of a clamp provided by an embodiment of the utility model;

[0025] Figure 3 It is a structural schematic diagram of a clamp provided by an embodiment of the utility model with a base;

[0026] Figure 4 It is a side view of the clamping mechanism provided in the embodiment of the utility model.

[0027] In the figure:

[0028] 1. Workpiece; 11. Positioning tube; 12. Flange;

[0029] 2. Clamping platform; 21. Positioning hole; 22. Second buffer pad;

[0030] 3. Positioning mechanism; 31. First housing; 32. Positioning member;

[0031] 4. Clamping mechanism; 41. Second housing; 42. Clamping member; 421. First buffer pad;

[0032] 5. Base. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figure 1 and Figure 2 As shown, this embodiment provides a clamp that can be used to clamp a workpiece 1 , including a clamping platform 2 , a positioning mechanism 3 and a pressing mechanism 4 .

[0038] Among them, a positioning hole 21 is opened on the clamping table 2, and the clamped workpiece 1 includes a positioning tube 11 and a flange 12 arranged around the end of the positioning tube 11. The positioning tube 11 can be inserted into the positioning hole 21, and the flange 12 is placed on the table surface of the clamping table 2 to facilitate clamping the flange 12 of the workpiece 1; a plurality of positioning mechanisms 3 are arranged along the circumference of the inner wall of the positioning hole 21 (such as 3 to 10, and 8 are arranged as an example in this embodiment), and the positioning mechanism 3 includes a first shell 31 and a positioning member 32, and the first shell 31 is fixed to the positioning hole 21. The inner wall, the positioning member 32 is telescopically arranged on the first shell 31 along the radial direction of the positioning hole 21, and can press or release the positioning cylinder 11 inserted in the positioning hole 21; the clamping mechanism 4 is provided with multiple (such as 3 to 10, and 8 are exemplarily provided in this embodiment), and multiple clamping mechanisms 4 are arranged on the outer periphery of the flange 12, the clamping mechanism 4 includes a second shell 41 and a clamping member 42, the second shell 41 is connected to the clamping table 2, and the clamping member 42 is rotatable around the vertical axis and is telescopically arranged on the second shell 41 along the vertical direction. When the workpiece 1 needs to be clamped and processed, the clamping member 42 of the clamping mechanism 4 is first rotated toward the outside of the clamping table 2 to avoid space so that the workpiece 1 can be smoothly placed on the clamping table 2. When placing, the positioning cylinder 11 of the workpiece 1 is inserted into the positioning hole 21, and the flange 12 is placed on the table surface of the clamping table 2. Then, the positioning members 32 of the plurality of positioning mechanisms 3 are driven to extend radially along the positioning hole 21 to press against the positioning cylinder 11, so that the positioning cylinder 11 is positioned; and, after the pressing member 42 of the pressing mechanism 4 is rotated to the position directly above the flange 12, the pressing member 42 is driven to move downward to press the flange 12 of the workpiece 1. At this time, the positioning cylinder 11 and the flange 12 are firmly fixed, and the workpiece 1 can be processed. When the processing is completed, the pressing member 42 is driven to move upward and rotate toward the outside of the clamping table 2 to release the flange 12 of the workpiece 1; and the positioning member 32 is driven to move radially along the positioning hole 21 to release the positioning cylinder 11, so that the workpiece 1 is removed from the clamping table 2. By opening a positioning hole 21 on the clamping table 2, the positioning cylinder 11 protruding downward from the workpiece 1 can be inserted, so that the flange 12 can be set on the table of the clamping table 2, so that the workpiece 1 can be stably clamped, and the workpiece 1 of a conventional plane shape can also be set on the table of the clamping table 2 and clamped; moreover, multiple positioning members 32 can move radially along the positioning hole 21 to clamp positioning cylinders 11 of various diameters, and the clamp can be used to place and clamp workpieces 1 of various structural forms and specifications, and has a wide range of applications. The positioning cylinder 11 of the workpiece 1 is tightly fixed by multiple positioning mechanisms 3, and the flange 12 of the workpiece 1 is pressed and fixed by multiple clamping mechanisms 4, so that the workpiece 1 can be effectively prevented from moving up and down and moving radially during the processing, and the workpiece 1 can be prevented from shaking, so that it can be kept stable, thereby accurately controlling the position of the workpiece 1 to be processed, ensuring the precision of the workpiece 1 processing, and improving the product quality. In this embodiment, the number of positioning mechanisms 3 and clamping mechanisms 4 is the same, both 8, which can fully clamp the workpiece 1, ensure the clamping effect, and prevent the workpiece 1 from shaking.In other embodiments, the number of positioning mechanisms 3 and pressing mechanisms 4 may also be set to be different as required.

[0039] Optionally, multiple positioning mechanisms 3 are evenly distributed along the circumference of the positioning hole 21, so that the pressure of the positioning member 32 is evenly distributed around the circumference of the positioning tube 11, preventing the positioning tube 11 from being tilted due to local bias, so that the workpiece 1 is accurately positioned. Multiple clamping mechanisms 4 are evenly distributed along the circumference of the positioning hole 21, that is, the clamping members 42 are evenly distributed along the circumference of the flange 12, and the flange 12 is subjected to relatively uniform and equal pressure along the circumference, so that the flange 12 is fully pressed on the table surface of the clamping table 2 and remains stable, preventing the workpiece 1 from shaking. In this embodiment, since multiple positioning mechanisms 3 and multiple clamping mechanisms 4 are evenly distributed along the circumference of the positioning hole 21, the positioning mechanisms 3 and the clamping mechanisms 4 work together, so that the workpiece 1 can be accurately positioned and fully clamped, so that the workpiece 1 remains stable as a whole, and the processing accuracy and product quality are improved.

[0040] Exemplarily, the pressing member 42 is an L-shaped pressing rod, one end of which is connected to the second housing 41, and the other end is used to press against or release the flange 12 of the workpiece 1. In other embodiments, pressing rods of other shapes may be selected as needed, which is not limited here.

[0041] In other embodiments, the clamped workpiece 1 may also be of a conventional shape (such as a circular plate structure, a square plate structure, etc., which are not limited here). In this case, the workpiece 1 may cover the positioning hole 21 and be directly stacked on the table surface of the clamping table 2 as a whole. After that, it is only necessary to drive the clamping member 42 to move vertically downward to clamp the workpiece 1. It can be seen that the clamping table 2 can be used to place workpieces 1 of various structural forms so that they can be clamped, and has a wide range of applications.

[0042] In this embodiment, the clamping table 2 is set to be rectangular, the positioning hole 21 is circular, and one clamping table 2 corresponds to one positioning hole 21. In other embodiments, the clamping table 2 can also be changed to a circular, elliptical or other form according to actual needs, and the diameter of the positioning hole 21 is not limited here. In addition, two or more positioning holes 21 can be set on the clamping table 2 to clamp multiple workpieces 1 at the same time to improve work efficiency.

[0043] Alternatively, if Figure 1 and Figure 3 As shown, the clamp also includes a plurality of bases 5, which are fixedly arranged on the lower surface of the clamping platform 2, and can be used to support the clamping platform 2. At the same time, the distance between the positioning hole 21 and the ground can be increased, and it can be used to place the workpiece 1 with a longer positioning cylinder 11, further expanding the scope of application. In this embodiment, four bases 5 are provided, distributed at the four corners of the clamping platform 2. In other embodiments, three or more bases 5 can also be provided as needed, and the plurality of bases 5 are evenly distributed around the circumference.

[0044] In an optional embodiment, if Figure 1 and Figure 4 As shown, the second shell 41 is fixedly connected to the clamping table 2, and a first buffer pad 421 is provided on the side of the clamping member 42 facing the flange 12. When the clamping member 42 moves downward to clamp the flange 12 of the workpiece 1, the first buffer pad 421 directly contacts the flange 12 to avoid scratching the upper surface of the workpiece 1. A second buffer pad 22 is provided on the table surface of the clamping table 2, and the flange 12 of the workpiece 1 is placed on the second buffer pad 22 to avoid scratching the lower surface of the workpiece 1. In addition, the distance between the rotation axis of the clamping member 42 and the first buffer pad 421 is equal to the distance between the rotation axis and the second buffer pad 22. In the initial position, the first buffer pad 421 and the second buffer pad 22 are vertically opposite to each other. When the workpiece 1 needs to be placed, the clamping member 42 is first rotated toward the outside of the clamping table 2 by a certain angle (the rotation angle can be as long as the avoidance condition is met. In this embodiment, the clamping member 42 is rotated 180° as an example) to make room for the workpiece 1, and the flange 12 is placed on the second buffer pad 22. After that, the positioning member 32 is pressed against the positioning cylinder 11, and the clamping member 42 is rotated in the opposite direction by the same angle. At this time, the first buffer pad 421 is restored to be vertically opposite to the second buffer pad 22, and finally the clamping member 42 moves downward to clamp the flange 12 of the workpiece 1. Pressing the flange 12 when the first buffer pad 421 and the second buffer pad 22 are vertically opposite to each other can prevent the flange 12 from being deformed due to bias pressure, and avoid the workpiece 1 from being scrapped due to abnormal processing, thereby reducing production efficiency.

[0045] For example, a silicone gasket is selected as the first buffer pad 421 and the second buffer pad 22. The silicone has good flexibility and elasticity, and can effectively prevent the upper and lower surfaces of the workpiece 1 from being scratched. In other embodiments, the first buffer pad 421 and the second buffer pad 22 can also be made of other materials such as plastic according to specific needs, which is not limited here.

[0046] In another optional embodiment, the second shell 41 is connected to the clamping table 2 in an adjustable manner along the radial position of the positioning hole 21. If the width of the flange 12 is greater than the initial distance from the second shell 41 to the positioning hole 21, the position of the second shell 41 can be adjusted along the radial direction of the positioning hole 21, so that the second shell 41 drives the clamping member 42 to slide in a direction away from the positioning hole 21, thereby increasing the distance from the second shell 41 to the positioning hole 21 and leaving enough space so that the flange 12 can be placed on the surface of the clamping table 2 and is easy to clamp. The second shell 41 is set to be adjustable along the radial position of the positioning hole 21, and the distance from the second shell 41 to the positioning hole 21 can be flexibly controlled, so that the clamping table 2 is suitable for placing workpieces 1 with various flange 12 sizes, further expanding the scope of application, and the structure is simple and easy to operate.

[0047] It should be noted that when adjusting the position of the pressing mechanism 4 , the sliding distance of the second housing 41 is determined by the width of the flange 12 .

[0048] Optionally, the clamp further includes a driving mechanism, the driving mechanism includes a third housing and an output end, the third housing is arranged on the clamping table 2, one end of the output end is connected to the third housing, and the other end is transmission-connected to the second housing 41. When the width of the flange 12 is large and the position of the second housing 41 needs to be adjusted, the driving mechanism drives the second housing 41 to move along the radial direction of the positioning hole 21, adjusts the position of the second housing 41, and flexibly adjusts the distance from the second housing 41 to the positioning hole 21, so that the clamping table 2 is suitable for placing workpieces 1 with various flange 12 sizes, has a simple structure, is easy to operate, and has a widened scope of application.

[0049] Exemplarily, a cylinder is selected as the driving mechanism, and the piston rod of the cylinder is the output end and is drivingly connected to the second housing 41, which can drive the second housing 41 to move radially along the positioning hole 21. In other embodiments, other forms of driving mechanisms can also be selected as needed, which are not limited here.

[0050] Optionally, the clamp further includes a guide rail mechanism, which includes a track and a slider. The track is arranged on the clamping table 2 and extends radially along the positioning hole 21. The lower end of the slider engages with the track and slides in cooperation with the track. The upper end is fixedly arranged on the lower surface of the second shell 41, so that the second shell 41 slides in cooperation with the track to guide the movement of the second shell 41. The guide rail mechanism can provide guidance for the second shell 41, so that the second shell 41 always moves radially along the positioning hole 21, improves the stability of movement, and avoids displacement of movement. Secondly, the track can also provide support so that the slider can bear the workload and achieve smooth movement; in addition, the use of the slider in cooperation with the track can reduce the friction between the components and ensure the smoothness of the sliding of the second shell 41.

[0051] Optionally, a receiving groove is provided on the clamping table 2, the receiving groove is recessed in the clamping table 2, the receiving groove extends along the radial direction of the positioning hole 21, the guide rail mechanism is provided in the receiving groove, and the groove wall of the receiving groove can limit the guide rail mechanism from slightly deviating, thereby improving the installation stability of the guide rail on the clamping table 2. In addition, the top surface of the guide rail mechanism is not higher than the table surface of the clamping table 2, so that the table surface of the clamping table 2 can be kept flat, and the guide rail is prevented from protruding relative to the clamping table 2 and affecting the installation of the flange 12.

[0052] Optionally, the clamp further includes a washer assembly, which includes a rigid layer and a flexible layer stacked, and the flexible layer is fixed to the rigid layer by bonding or the like. The rigid layer can be mounted on the clamping table 2 by screws, or directly laid on the clamping table 2. The second shell 41 is set to be adjustable along the radial position of the positioning hole 21 and connected to the clamping table 2. Before the workpiece 1 is placed on the clamping table 2, the washer assembly needs to be laid on the table surface of the clamping table 2 to cover the accommodating groove, thereby leveling the table surface of the clamping table 2, so that the flange 12 is laid on the flat flexible layer of the washer assembly, which can avoid scratching the lower surface of the workpiece 1, prevent damage to the workpiece 1, and affect the quality and precision of the workpiece 1. When the workpiece 1 is processed and removed, the rigid layer can be disassembled and removed from the clamping table 2 to avoid the operating space, which is convenient for adjusting the position of the second shell 41, and can also be recycled for secondary use, saving costs. In this embodiment, the size of the washer assembly is consistent with the size of the flange 12. In other embodiments, the size of the washer assembly can also be adjusted according to actual conditions.

[0053] Exemplarily, a steel ring is selected as the rigid layer, which has high strength and can avoid being crushed, and a silicone ring is selected as the flexible layer, and the steel ring and the silicone ring are stacked and fixed.

[0054] In other embodiments, materials that can resist deformation, such as iron rings and copper rings, can be selected as the rigid layer, and materials with good elasticity, such as plastics, can be selected as the flexible layer, which is not limited here.

[0055] Optionally, a third buffer pad is provided on the side of the positioning member 32 facing the positioning cylinder 11. When the positioning member 32 extends radially along the positioning hole 21 and presses against the positioning cylinder 11, the third buffer pad is in direct contact with the positioning cylinder 11, which can avoid scratching the positioning cylinder 11, prevent damage to the workpiece 1, and ensure the surface quality of the workpiece 1.

[0056] Exemplarily, a silicone gasket is selected as the third buffer pad. In other embodiments, gaskets made of other materials such as plastic may be selected according to specific needs, which is not limited here.

[0057] Optionally, the clamping mechanism 4 is a rotary clamping cylinder, the cylinder body of the rotary clamping cylinder is the above-mentioned second housing 41, and the telescopic rod of the rotary clamping cylinder is the above-mentioned clamping member 42. The rotary clamping cylinder can be installed in a small space with limited space, and realizes the functions of rotation and clamping at the same time, with both rotary radial action and vertical clamping action, which greatly reduces the time of clamping and releasing the workpiece 1, reduces the number of parts used, can make full use of space, improves the space utilization rate of the fixture, and can reduce the cost of the fixture.

[0058] In other embodiments, the clamping mechanism 4 may include a Z-axis linear module and a rotary motor. In this case, the housing of the Z-axis linear module and the rotary motor is the above-mentioned second housing 41, and the above-mentioned clamping member 42 is connected to the output shaft of the rotary motor. The Z-axis linear module is arranged on the clamping table 2, and the housing of the rotary motor is arranged at the output end of the Z-axis linear module. The Z-axis linear module can drive the rotary motor to move vertically, thereby realizing the vertical movement of the clamping member 42; the output shaft of the rotary motor is arranged vertically, and can drive the clamping member 42 to rotate around the vertical axis. The vertical movement and rotation of the clamping member 42 can also be realized through the above scheme.

[0059] The Z-axis linear module is an existing mature technology and will not be described in detail here.

[0060] The process of clamping the workpiece 1 provided by the clamp in this embodiment is as follows:

[0061] S1, adjusting the positions of the plurality of clamping mechanisms 4 according to the width of the flange 12 of the workpiece 1, that is, driving the plurality of clamping mechanisms 4 to move radially along the positioning hole 21; and rotating the clamping members 42 of the clamping mechanisms 4 toward the outside of the clamping table 2;

[0062] S2, insert the positioning tube 11 of the workpiece 1 into the positioning hole 21, and place the flange 12 on the table surface of the clamping table 2;

[0063] S3, drive the positioning members 32 of the multiple positioning mechanisms 3 to extend radially along the positioning hole 21 to press against the positioning cylinder 11, so that the positioning cylinder 11 is positioned; and, after rotating the pressing member 42 of the pressing mechanism 4 to just above the flange 12, drive the pressing member 42 to move downward to press the flange 12 of the workpiece 1, at which time the positioning cylinder 11 and the flange 12 are both firmly fixed. Obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not limitations on the implementation methods of the utility model. For ordinary technicians in the relevant field, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the utility model. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A clamp for clamping a workpiece (1), wherein the workpiece (1) comprises a positioning tube (11) and a flange (12) arranged around the end of the positioning tube (11); characterized in that: The fixture comprises: A clamping platform (2), wherein a positioning hole (21) is provided on the clamping platform (2), wherein the positioning hole (21) is used for inserting the positioning cylinder (11), and the surface of the clamping platform (2) is used for mounting the flange (12); A plurality of positioning mechanisms (3) are arranged along the circumference of the inner wall of the positioning hole (21); the positioning mechanism (3) comprises a first shell (31) and a positioning member (32); the first shell (31) is fixedly arranged on the inner wall of the positioning hole (21); the positioning member (32) is telescopically arranged on the first shell (31) along the radial direction of the positioning hole (21) to press against or release the positioning cylinder (11); A plurality of clamping mechanisms (4) are provided along the outer periphery of the flange (12); each of the clamping mechanisms (4) comprises a second shell (41) and a clamping member (42); the second shell (41) is connected to the clamping platform (2); the clamping member (42) is rotatable about a vertical axis and is vertically movably arranged on the second shell (41).

2. The clamp according to claim 1, characterized in that: The second shell (41) is fixedly connected to the clamping platform (2); a first buffer pad (421) is arranged on the side of the clamping member (42) facing the flange (12); a second buffer pad (22) is arranged on the table surface of the clamping platform (2); and the distance between the rotation axis of the clamping member (42) and the first buffer pad (421) is equal to the distance between the rotation axis and the second buffer pad (22).

3. The clamp according to claim 1, characterized in that: The second shell (41) is connected to the clamping platform (2) in an adjustably radial position along the positioning hole (21).

4. The clamp according to claim 3, characterized in that: The clamp further comprises a driving mechanism, the driving mechanism comprising a third shell and an output end, the third shell is arranged on the clamping platform (2), and the output end is transmission-connected to the second shell (41) to drive the second shell (41) to move radially along the positioning hole (21).

5. The clamp according to claim 3, characterized in that: The clamp further comprises a guide rail mechanism, which is arranged on the clamping platform (2) and extends radially along the positioning hole (21), and the second housing (41) is slidably matched with the guide rail mechanism.

6. The clamp according to claim 5, characterized in that: The clamping platform (2) is provided with a receiving groove, the guide rail mechanism is arranged in the receiving groove, and the top surface of the guide rail mechanism is not higher than the table surface of the clamping platform (2).

7. The clamp according to any one of claims 3 to 6, characterized in that: The clamp also includes a gasket assembly, which includes a stacked rigid layer and a flexible layer. The rigid layer is detachably laid on the table surface of the clamping table (2), and the flexible layer is in contact with the flange (12).

8. The clamp according to any one of claims 1 to 6, characterized in that: A third buffer pad is provided on the side of the positioning member (32) facing the positioning cylinder (11), and the third buffer pad can be in contact with the positioning cylinder (11).

9. The clamp according to any one of claims 1 to 6, characterized in that: The plurality of positioning mechanisms (3) are evenly distributed along the circumference of the positioning hole (21); and / or the plurality of pressing mechanisms (4) are evenly distributed along the circumference of the positioning hole (21).

10. The clamp according to any one of claims 1 to 6, characterized in that: The clamping mechanism (4) is a rotary clamping cylinder.

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