Cylindrical workholding devices and systems

Abstract

The present application provides a columnar workpiece clamping device and system for a columnar workpiece, wherein a processing base is provided at one end of the columnar workpiece, and the columnar workpiece clamping device includes a fixed seat, a fastener, and a pressure plate. The fixed seat is provided with a locking hole along a first direction, and the shape and size of the locking hole correspond to the processing base setting. The outer peripheral surface of the fixed seat is provided with abutment holes and positioning grooves in sequence toward the locking hole, and the abutment holes, positioning grooves, and locking holes are connected; the fastener is passed through the abutment hole and movably connected to the fixed seat; the pressure plate is provided in the positioning groove, and the fastener at least partially movably abuts against the wall of the side of the pressure plate away from the locking hole, and the pressure plate is close to the wall of the side of the locking hole for movably abutting against the processing base. The columnar workpiece clamping device and system provided by the present application relate to the field of fixture technology, wherein the processing base at one end of the columnar workpiece is fixed by the locking hole, and the processing base is fixed by the fastener and the pressure plate, so as to fix the columnar workpiece while avoiding damage to the workpiece surface.

Description

Technical Field

[0001] The present application belongs to the technical field of clamps, and more specifically, relates to a columnar workpiece clamping device and a columnar workpiece clamping system. Background Art

[0002] Columnar workpieces are common part shapes in the industrial field and have a wide range of usage scenarios. In the processing of columnar workpieces such as titanium bars, aluminum bars, copper bars, nickel bars or steel bars, different processing procedures will be adopted according to the number of processing. For example, in small-batch production, manual clamping and subsequent processing are performed through marking, drilling, adjusting positioning, etc., with low positioning accuracy and time-consuming operation; in large-scale production, a special clamping device is usually set up to open a groove to accommodate the workpiece and use fasteners to clamp and fix the workpiece.

[0003] However, in the existing columnar workpiece clamping device, the installation and removal process of the fasteners that abut and fix the columnar workpiece is relatively difficult. A single part is used for clamping and fixing, and its contact area with the workpiece is small, which can easily apply a large pressure to the workpiece surface and damage the workpiece surface. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a columnar workpiece clamping device and system, aiming to improve the deficiencies of the above-mentioned prior art, further improve the flexibility of use and working stability of the columnar workpiece clamping device, and avoid possible damage to the workpiece surface during the fixed clamping process.

[0005] In order to achieve the above-mentioned purpose, the columnar workpiece clamping device proposed in the present application is used for a columnar workpiece, one end of which is provided with a processing base, and the columnar workpiece clamping device includes a fixed seat, a fastener and a pressure plate. The fixed seat is provided with a locking hole along a first direction, and the shape and size of the locking hole correspond to the processing base. The outer peripheral surface of the fixed seat is provided with abutment holes and positioning grooves in sequence toward the locking hole, and the abutment holes, positioning grooves and the locking holes are connected; the fastener is passed through the abutment hole and movably connected with the fixed seat; the pressure plate is provided in the positioning groove, and the fastener at least partially movably abuts against the wall of the pressure plate on the side away from the locking hole, and the wall of the pressure plate on the side close to the locking hole is used to movably abut against the processing base.

[0006] As a feasible implementation, the direction in which the abutment hole and the positioning groove are arranged toward the locking hole is defined as the second direction, the width of the positioning groove along the second direction is defined as D1, the width of the pressure plate along the second direction is defined as D2, and D2<D1.

[0007] As a feasible implementation manner, an avoidance hole is recessed on the inner wall surface of the positioning groove, and the opening of the avoidance hole is arranged toward the pressure plate.

[0008] As a feasible implementation manner, there are multiple avoidance holes, and each avoidance hole is correspondingly arranged at the connection between two adjacent wall surfaces in the positioning groove.

[0009] As a feasible implementation manner, the abutment hole is a threaded hole, and the fastener is threadedly connected to the abutment hole.

[0010] As a feasible implementation manner, the fastener is a set screw.

[0011] As a feasible embodiment, the fixed seat is also formed with a positioning hole, the positioning hole and the abutment hole are arranged at intervals along the circumference of the locking hole, the positioning hole is connected to the positioning groove, and the columnar workpiece clamping device also includes a positioning column, which is passed through the positioning hole and fixedly connected to the pressure plate.

[0012] As a feasible implementation manner, the number of the positioning holes is at least two, the number of the positioning posts corresponds to the number of the positioning posts, and at least two positioning holes are symmetrically arranged on both sides of the abutment hole.

[0013] The utility model also provides a columnar workpiece clamping system, including a clamping body and a columnar workpiece clamping device as described in any of the above embodiments, wherein the clamping body is formed with a mounting hole, and a tail handle is protruded on the side of the fixing seat away from the locking hole, and the tail handle is detachably connected to the mounting hole.

[0014] As a feasible implementation manner, a snap-in groove is formed on the side of the tail handle away from the abutment hole, and the clamp body is provided with a snap-in protrusion corresponding to the snap-in groove. When the tail handle is detachably connected to the mounting hole, the snap-in protrusion is at least partially snap-into the snap-in groove.

[0015] Compared with the prior art, the columnar workpiece clamping device provided in the embodiment of the present application has the following beneficial effects:

[0016] The machining base at one end of the columnar workpiece is fixed by a locking hole, and the machining base is fixed by fasteners and a pressure plate, so that the columnar workpiece is fixed while avoiding damage to the workpiece surface, further improving the use flexibility and working stability of the columnar workpiece clamping device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a columnar workpiece clamping system and a columnar workpiece provided in an embodiment of the present application;

[0019] Figure 2 A schematic structural diagram of a columnar workpiece clamping device and a columnar workpiece provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of the columnar workpiece clamping device provided in an embodiment of the present application from another angle Figure 2 ;

[0021] Figure 4 for Figure 3 The cross-sectional structural schematic diagram of the columnar workpiece clamping device shown.

[0022] Among them, the reference numerals in the figure are:

[0023] 1000, columnar workpiece clamping system; 100, columnar workpiece clamping device; 10, fixing seat; 11, locking hole; 12, positioning hole; 13, abutment hole; 15, positioning groove; 17, avoidance hole; 19, snap-in groove; 20, positioning column; 30, fastener; 50, pressure plate; 70, tail handle; 300, clamping body; 310, mounting hole; 330, snap-in protrusion; 500, columnar workpiece; 510, machining base. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Columnar workpieces are common part shapes in the industrial field and have a wide range of usage scenarios. In the processing of columnar workpieces such as titanium bars, aluminum bars, copper bars, nickel bars or steel bars, different processing procedures will be adopted according to the number of processing. For example, in small-batch production, manual clamping and subsequent processing are performed through marking, drilling, adjusting positioning, etc., with low positioning accuracy and time-consuming operation; in large-scale production, a special clamping device is usually set up to open a groove to accommodate the workpiece and use fasteners to clamp and fix the workpiece.

[0029] However, in the existing columnar workpiece clamping device, the installation and removal process of the fasteners that abut and fix the columnar workpiece is relatively difficult. A single part is used for clamping and fixing, and its contact area with the workpiece is small, which can easily apply a large pressure to the workpiece surface and damage the workpiece surface.

[0030] Compared with the prior art, the columnar workpiece clamping device provided in the embodiment of the present application has the following beneficial effects:

[0031] The machining base at one end of the columnar workpiece is fixed by a locking hole, and the machining base is fixed by fasteners and a pressure plate, so that the columnar workpiece is fixed while avoiding damage to the workpiece surface, further improving the use flexibility and working stability of the columnar workpiece clamping device.

[0032] The following will be combined Figures 1 to 4 , the columnar workpiece clamping device and the columnar workpiece clamping system provided in the embodiments of the present application are described in detail through specific embodiments.

[0033] Please also read Figures 1 to 4 , Figure 1 A schematic diagram of the structure of a columnar workpiece clamping system and a columnar workpiece provided in an embodiment of the present application; Figure 2 A schematic structural diagram of a columnar workpiece clamping device and a columnar workpiece provided in an embodiment of the present application; Figure 3A schematic diagram of the structure of the columnar workpiece clamping device provided in an embodiment of the present application from another angle Figure 2 ; Figure 4 for Figure 3 The schematic diagram of the cross-sectional structure of the columnar workpiece clamping device shown. One embodiment of the utility model proposes a columnar workpiece clamping device 100, which is used for a columnar workpiece 500. A processing base 510 is provided at one end of the columnar workpiece 500. The columnar workpiece clamping device 100 includes a fixed seat 10, a fastener 30 and a pressing plate 50. The fixed seat 10 is provided with a locking hole 11 along the first direction. The shape and size of the locking hole 11 correspond to the processing base 510. The outer peripheral surface of the fixed seat 10 is provided with abutment holes 13 and positioning grooves 15 in sequence toward the locking hole 11. The abutment holes 13, the positioning grooves 15 and the locking hole 11 are connected. The fastener 30 is inserted into the abutment hole 13 and movably connected with the fixed seat 10. The pressing plate 50 is arranged in the positioning groove 15. The fastener 30 at least partially movably abuts against the wall of the pressing plate 50 on the side away from the locking hole 11. The wall of the pressing plate 50 on the side close to the locking hole 11 is used to movably abut against the processing base 510.

[0034] It can be understood that the locking hole 11 is used to accommodate the processing base 510 pre-processed in the columnar workpiece 500 to be processed. Specifically, the cross-sectional shape and size of the locking hole 11 along the first direction are set corresponding to the processing base 510. In this way, during the operation of the columnar workpiece clamping device 100, the columnar workpiece 500 to be processed can be inserted into the locking hole 11 along the first direction, so that the columnar workpiece 500 and the fixed seat 10 of the columnar workpiece clamping device 100 have a relatively fixed position relationship. The fixed seat 10 is also formed with a positioning groove 15 for accommodating the pressure plate 50 and an abutment hole 13 corresponding to the outer peripheral surface of the fixed seat 10 facing the positioning groove 15. The abutment hole 13 is used to flexibly connect the fastener 30 and guide the moving direction of the fastener 30 during the active connection process. Specifically, the abutment hole 13, the positioning groove 15 and the locking hole 11 are connected, so that at least a portion of the end surface of the pressure plate 50 arranged in the positioning groove 15 is exposed at the connection between the positioning groove 15 and the locking hole 11, that is, during the operation of the columnar workpiece clamping device 100, at least a portion of the end surface is used to abut against the outer peripheral surface of the processing base 510 of the columnar workpiece 500 to be processed. The fastener 30 in the abutment hole 13 is at least partially able to movably abut the end face of the pressure plate 50 away from the locking hole 11, and in the process of movable abutment, pressure is applied toward the pressure plate 50 through the abutment process with the pressure plate 50, and the pressure is indirectly transmitted from the pressure plate 50 toward the outer peripheral surface of the processing base 510, so that the fastener 30, the pressure plate 50 and the processing base 510 have a relatively stable positional relationship, while ensuring the clamping effect of the columnar workpiece clamping device 100 on the columnar workpiece 500 to be processed, the pressure plate 50 further increases the contact area between the columnar workpiece clamping device 100 and the processing base 510, thereby reducing the pressure on the processing base 510 per unit area, avoiding excessive local pressure and possible damage to the end face of the processing base 510, and further improving the working stability of the columnar workpiece clamping device 100.

[0035] As a possible implementation, see Figures 2 to 4 , define the direction in which the abutment hole 13 and the positioning groove 15 are arranged toward the locking hole 11 as the second direction, define the width of the positioning groove 15 along the second direction as D1, and define the width of the pressing plate 50 along the second direction as D2, D2<D1.

[0036] It can be understood that during the operation of the present cylindrical workpiece clamping device 100, the fastener 30 arranged in the abutment hole 13 is limited by the extension direction of the abutment hole 13, and the pressure applied by the fastener 30 to the pressure plate 50 also extends along the second direction. At this time, the width D1 of the positioning groove 15 along the second direction is set to be greater than the width D2 of the pressure plate 50 along the second direction. In this way, the pressure plate 50 can have space to move along the second direction in the positioning groove 15. In the process of extending the columnar workpiece 500 to be processed into the locking hole 11 before being fixed, it will not be hindered by the pressure plate 50, which further facilitates the installation and disassembly process of the columnar workpiece 500 to be processed, that is, further improves the use efficiency of the present cylindrical workpiece clamping device 100.

[0037] As a possible implementation, see Figure 1 , Figure 2 and Figure 4 The inner wall surface of the positioning groove 15 is concavely provided with an avoidance hole 17 , and the opening of the avoidance hole 17 is arranged toward the pressing plate 50 .

[0038] It can be understood that the avoidance hole 17 recessed in the inner wall of the positioning groove 15 is opened toward the pressure plate 50, which can provide more space for the movement of the pressure plate 50 in the positioning groove 15. During the operation of the columnar workpiece clamping device 100, while ensuring that the size of the pressure plate 50 is not much different from that of the positioning groove 15 and having better space utilization, it can also avoid the pressure plate 50 from colliding with or being damaged by the inner wall of the positioning groove 15 during the process of being installed in the positioning groove 15 or being taken out of the positioning groove 15, thereby further improving the working stability and service life of the pressure plate 50 and the columnar workpiece clamping device 100.

[0039] As a possible implementation, see Figure 1 , Figure 2 and Figure 4 There are multiple avoidance holes 17 , and each avoidance hole 17 is correspondingly arranged at the connection between two adjacent wall surfaces in the positioning groove 15 .

[0040] It should be noted that a plurality of avoidance holes 17 are provided correspondingly, and each avoidance hole 17 is provided at the connection between two adjacent wall surfaces in the positioning groove 15. In this way, the corners where any two adjacent wall surfaces in the positioning groove 15 are connected have more space to avoid possible collision or damage with the edge of the pressure plate 50, further improving the working stability of the pressure plate 50 and the columnar workpiece clamping device 100. On the other hand, when the pressure plate 50 is abutted by the fastener 30 in the positioning groove 15 and applies pressure toward the processing base 510, it may have a part of the end surface that is not exposed at the connection between the positioning groove 15 and the locking hole 11. This part of the wall surface abuts against the inner wall surface of the positioning groove 15 and also applies pressure to the inner wall surface of the positioning groove 15. At this time, the avoidance hole 17 provided at the connection between the two adjacent wall surfaces of the positioning groove 15 further disperses and releases the pressure and evenly shares it, further improving the bearing capacity and service life of the fixing seat 10, and reducing the risk of deformation and damage.

[0041] As a feasible implementation manner, the abutment hole 13 is a threaded hole, and the fastener 30 is threadedly connected to the abutment hole 13 .

[0042] It can be understood that, compared with sliding connection, hinged connection, elastic connection or snap-on connection, the fastener 30 movably connected to the fixing seat 10 by a threaded connection has relatively stable rigidity and stability with the fixing seat 10, can withstand large forces and torques after tightening, can be tightened or disassembled by bolts or nuts of different types, is simple and convenient to operate, has a linear motion process, and can achieve subtle position adjustment or stress adjustment by adjusting the position of the bolts or nuts, further improving the working accuracy and clamping stability of the fastener 30 and the columnar workpiece clamping device 100.

[0043] As a feasible implementation manner, the fastener 30 is a set screw.

[0044] It can be understood that the fastener 30 threadedly connected to the abutment hole 13 set in the fixing seat 10 includes but is not limited to common fixing screw types such as pan head screws, flat head screws, round head screws, hexagon head screws, etc., and the present application does not make specific limitations on this. Compared with the method of directly abutting the columnar workpiece 500 with a flat head screw to process the base 510, the fastener 30 abuts the pressure plate 50, and the pressure plate 50 abuts the columnar workpiece 500 to process the base 510, which expands the application scenarios of the threaded fastener 30. Different fixing screws can be selected according to different application requirements or application scenarios, further improving the flexibility of use of the fastener 30 and the columnar workpiece clamping device 100 and reducing production costs.

[0045] As a possible implementation, see Figure 2 and Figure 3The fixing seat 10 is also formed with a positioning hole 12. The positioning hole 12 and the abutment hole 13 are arranged at intervals along the circumference of the locking hole 11. The positioning hole 12 is connected to the positioning groove 15. The columnar workpiece clamping device 100 also includes a positioning column 20. The positioning column 20 is passed through the positioning hole 12 and fixedly connected to the pressure plate 50.

[0046] It is understandable that the positioning column 20 passing through the positioning hole 12 further stabilizes the relative position relationship between the pressure plate 50 and the fixing seat 10. The connection between the positioning column 20 and the positioning hole 12 can be a pin connection, a snap connection, an elastic connection or a threaded connection, etc., which is not specifically limited in this application. The positioning hole 12 arranged with the abutment hole 13 along the circumferential spacing of the locking hole 11 has an extending setting direction toward the locking hole 11 while being connected to the positioning groove 15, and its side wall surface is at least partially not parallel to the opening direction of the locking hole 11, that is, the first direction. The pressure plate 50 arranged in the positioning groove 15 may have a tendency to move along the first direction and / or the second direction. Its movement tendency along the second direction is limited by the fasteners 30 on both sides of the positioning groove 15 or the side walls of the positioning groove 15, and its movement tendency along the first direction is further limited by the positioning column 20 fixedly connected thereto. When the pressure plate 50 has a tendency to move along the first direction, it drives the positioning column 20 to also apply pressure in the first direction, and the pressure is evenly shared by the inner wall surface of the positioning hole 12. In this way, the position stability of the pressure plate 50 is further improved, that is, the use stability of the columnar workpiece clamping device 100 is improved.

[0047] It should be noted that, in a preferred embodiment, the central axes of the locking holes 11 and the positioning holes 12 that are spaced apart are not in the same plane in the second direction, that is, they are arranged in parallel and staggered along the first direction. In this way, the pressure that may be generated by the pressure plate 50 when it has a tendency to move along the first direction is further evenly distributed, thereby once again improving the position stability of the pressure plate 50 and the use stability of the columnar workpiece clamping device 100.

[0048] As a possible implementation, see Figure 2 and Figure 3 The number of the positioning holes 12 is at least two, the number of the positioning posts 20 is arranged corresponding to the number of the positioning posts 20 , and at least two positioning holes 12 are symmetrically arranged on both sides of the abutting hole 13 .

[0049] It can be understood that at least two positioning holes 12 are symmetrically arranged on both sides of the abutment hole 13. In this way, at least two positioning columns 20 are fixedly connected to the pressure plate 50 at the positions on both sides of the abutment hole 13, respectively, to limit the movement tendency of the pressure plate 50 along the first direction. At the same time, in the plane where the central axes of at least two positioning columns 20 are located, the component forces that the pressure plate 50 may be subjected to and are not parallel to the plane will offset each other on both sides of the symmetrical central axis of the abutment hole 13, thereby further improving the position stability of the pressure plate 50 and the clamping stability of the columnar workpiece clamping device 100.

[0050] See also Figure 1 The technical solution of the utility model also proposes a columnar workpiece clamping system 1000, which includes a clamping body 300 and any one of the columnar workpiece clamping devices 100 described above. The specific structure of the columnar workpiece clamping device 100 refers to the above embodiments. Since the columnar workpiece clamping system 1000 of this solution adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0051] In another feasible implementation manner of the present application, refer to Figure 1 The clamp body 300 is formed with a mounting hole 310 , and a tail handle 70 is protruded from one side of the fixing seat 10 away from the locking hole 11 , and the tail handle 70 is detachably connected to the mounting hole 310 .

[0052] It can be understood that the present columnar workpiece clamping system 1000 does not specifically limit the number of columnar workpiece clamping devices 100, and multiple mounting holes 310 may be provided in the clamping body 300 and arranged at intervals. In this way, multiple columnar workpiece clamping devices 100 of different shapes and sizes may be provided corresponding to the number of mounting holes 310 and may be detachably connected to the clamp, thereby further improving the flexibility and accuracy of use of the present columnar workpiece clamping system 1000.

[0053] In another feasible implementation manner of the present application, refer to Figure 1 A snap-in groove 19 is formed on the side of the tail handle 70 away from the abutment hole 13 , and a snap-in protrusion 330 is convexly provided on the clamp body 300 corresponding to the snap-in groove 19 . When the tail handle 70 is detachably connected to the mounting hole 310 , the snap-in protrusion 330 is at least partially snap-into the snap-in groove 19 .

[0054] It can be understood that the tail handle 70 detachably connected to the mounting hole 310 may have a tendency to rotate along the center of the circular cross-section during operation when the mounting hole 310 and the cross-section of the tail handle 70 are circular. A clamping groove 19 is formed at the end of the tail handle 70 away from the abutment hole 13, and a corresponding clamping protrusion 330 is convexly provided on the clamp body 300. In this way, the mounting hole 310 and the clamping protrusion 330 together construct multiple fixed support points of the columnar workpiece clamping device 100, thereby avoiding the possible rotation tendency of the columnar workpiece clamping device 100 and further improving the use accuracy and stability of the columnar workpiece clamping system 1000.

[0055] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A columnar workpiece clamping device for a columnar workpiece, wherein one end of the columnar workpiece is provided with a processing base, characterized in that: The columnar workpiece clamping device comprises: A fixing seat, wherein the fixing seat is provided with a locking hole along a first direction, the locking hole has a shape and size corresponding to the processing base, and an abutment hole and a positioning groove are sequentially provided on the outer peripheral surface of the fixing seat toward the locking hole, and the abutment hole, the positioning groove and the locking hole are connected; A fastener, the fastener is inserted into the abutment hole and movably connected to the fixing seat; and A pressure plate is arranged in the positioning groove, the fastener at least partially movably abuts against the wall surface of the pressure plate on the side away from the locking hole, and the pressure plate is close to the wall surface of the locking hole on the side for movably abutting against the processing base.

2. The columnar workpiece clamping device according to claim 1, characterized in that: The direction in which the abutting hole and the positioning groove are arranged toward the locking hole is defined as a second direction, the width of the positioning groove along the second direction is defined as D1, and the width of the pressing plate along the second direction is defined as D2, where D2<D1.

3. The columnar workpiece clamping device according to claim 2, characterized in that: An avoidance hole is concavely formed on the inner wall surface of the positioning groove, and the opening of the avoidance hole is arranged toward the pressing plate.

4. The columnar workpiece clamping device according to claim 3, characterized in that: There are multiple avoidance holes, and each avoidance hole is correspondingly arranged at the connection between two adjacent wall surfaces in the positioning groove.

5. The columnar workpiece clamping device according to claim 1, characterized in that: The abutment hole is a threaded hole, and the fastener is threadedly connected to the abutment hole.

6. The columnar workpiece clamping device according to claim 5, characterized in that: The fastener is a set screw.

7. The columnar workpiece clamping device according to claim 1, characterized in that: The fixing seat is also formed with a positioning hole, the positioning hole and the abutment hole are arranged at intervals along the circumference of the locking hole, the positioning hole is connected to the positioning groove, and the columnar workpiece clamping device also includes a positioning column, which is passed through the positioning hole and fixedly connected to the pressure plate.

8. The columnar workpiece clamping device according to claim 7, characterized in that: The number of the positioning holes is at least two, the number of the positioning posts corresponds to the number of the positioning posts, and at least two positioning holes are symmetrically arranged on both sides of the abutting hole.

9. A columnar workpiece clamping system, characterized in that: It comprises a clamping body and a columnar workpiece clamping device as claimed in any one of claims 1 to 8, wherein the clamping body is formed with a mounting hole, a tail handle is protruded from a side of the fixing seat away from the locking hole, and the tail handle is detachably connected to the mounting hole.

10. The columnar workpiece clamping system according to claim 9, characterized in that: A clamping groove is formed on one side of the tail handle away from the abutment hole, and the clamp body is provided with a clamping protrusion corresponding to the clamping groove. When the tail handle is detachably connected to the mounting hole, the clamping protrusion is at least partially clamped in the clamping groove.

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