Harvard clamp

Abstract

The utility model particularly discloses a large-stroke Haver clamp. The large-stroke Haver clamp comprises a clamp bottom plate and a clamp top plate. A central positioning block is arranged between the clamp bottom plate and the clamp top plate; the central positioning block is rotationally connected with a fixed gear rod; threaded grooves opposite in direction are formed in the two ends of the fixed gear rod, the two ends of the fixed gear rod are in threaded connection with a left clamping arm and a right clamping arm through the threaded grooves, and the distance between the left clamping arm and the right clamping arm can be adjusted by rotating the fixed gear rod. According to the large-stroke Haver clamp, by changing the structure of the large-stroke Haver clamp, the distance between the left clamping arm and the right clamping arm of the large-stroke Haver clamp can be adjusted, and the clamping requirement for large-range pipe diameters can be met.

Description

Technical Field

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

[0002] Haval clamps refer to tools used to fix and clamp various materials. They are commonly used in woodworking, metal processing and other manufacturing fields. They provide stable clamping for the clamped materials to ensure that the working materials will not move or deform during the processing. Haval clamps can be used for various applications, including fixing wood and metal plates; among them, in metal processing, Haval clamps can fix metal plates and profiles for welding, cutting or drilling.

[0003] In the existing technology, at present, Haval clamps usually adopt a short-stroke design, that is, the stroke length of the clamping part is relatively short. This design has the following advantages. First, the short-stroke design makes the clamping action of the clamp faster, saving working time and improving work efficiency. Second, the short-stroke design can provide a more uniform and stable clamping force to ensure that the workpiece will not move or deform during the processing process. Third, compared with long-stroke clamps, short-stroke clamps occupy less space when not in use, which is convenient for storage and organization of the work area.

[0004] The above-mentioned Haval clamp solution can meet the clamping requirements of some pipe diameters during the operation of welding metal pipes, but it still has certain defects. The Haval clamp with a short stroke design supports a small pipe diameter clamping range, and it is difficult to provide stable clamping for metal pipes with different pipe diameter ranges. When the Haval clamp needs to clamp metal pipes with a larger pipe diameter range, different clamping blocks need to be replaced during use, which is inconvenient to use. Utility Model Content

[0005] The purpose of the utility model is to provide a Haver clamp, by changing the structure of the clamp, the distance between the left clamp arm and the right clamp arm of the clamp can be adjusted, which can meet the clamping requirements of a larger range of pipe diameters.

[0006] According to the purpose of this application, a Haval clamp is provided, including a center positioning block, which is rotatably connected to a fixed gear rod; both ends of the fixed gear rod are provided with thread grooves in opposite directions, and the two ends of the fixed gear rod are threadedly connected to a left clamp arm and a right clamp arm through the thread grooves, and the distance between the left clamp arm and the right clamp arm can be adjusted by rotating the fixed gear rod.

[0007] In some embodiments, the center positioning block is also rotatably connected to two movable gear rods; both movable gear rods are provided with thread grooves; the thread grooves on the fixed gear rod and the movable gear rod are the same size; the two movable gear rods are symmetrically arranged on both sides of the center positioning block, and the two movable gear rods are respectively threadedly connected to the left clamping arm and the right clamping arm through the thread grooves; the fixed gear rod and the movable gear rod are engaged and rotated synchronously through a gear structure.

[0008] In some embodiments, the center positioning block is also rotatably connected to a transmission gear rod; the transmission gear rod is located between the fixed gear rod and the movable gear rod; two first gears are provided on the fixed gear rod, and two second gears are provided on the two movable gear rods, and two third gears are provided on the transmission gear rod; the first gear is meshed with the second gear through the third gear; wherein, the first gear and the second gear have the same size.

[0009] In some embodiments, the center positioning block includes a first positioning block and a second positioning block; the first positioning block is detachably connected to the second positioning block; the center positioning block is provided with a first axial hole and a second axial hole; a first bearing rotatably connected to the fixed gear rod is provided in the first axial hole; and a second bearing rotatably connected to the transmission gear rod is provided in the second axial hole.

[0010] In some embodiments, the left clamp arm and the right clamp arm are both detachably and rotatably connected to two movable blocks; the movable blocks are provided with threaded holes matching the thread grooves; wherein, the two movable blocks rotatably connected to the left clamp arm or the right clamp arm are respectively threadedly connected to the fixed gear rod and the movable gear rod through the thread grooves.

[0011] In some embodiments, two side end limit blocks are further included; the two side end limit blocks are respectively located on both sides of the central positioning block; a clamp arm tension adjustment mechanism is provided between the two movable gear rods; the clamp arm tension adjustment mechanism is used to adjust the distance between the two movable gear rods; a reset spring is provided between the movable gear rod and the adjacent side end limit blocks; the reset spring is used to reset the distance between the two movable gear rods.

[0012] In some embodiments, it also includes a rotating shaft, two limit columns and two shift blocks; the clamp arm tension adjustment mechanism includes a clamp wrench and a top block; the clamp wrench is rotatably connected to the rotating shaft; the top block is installed on the clamp wrench, and the two shift blocks are limited between the two limit columns, and the two shift blocks are symmetrically arranged on both sides of the top block; the clamp wrench is pulled to drive the top block to move, and the displacement of the top block drives the two shift blocks to rotate, and the rotation of the two shift blocks drives the displacement of the two movable gear rods.

[0013] In some embodiments, a movable shaft is provided on the center positioning block; a movable limiting hole is provided on the side end limiting block; the movable gear rod includes a screw section, a gear section and a sleeve section; the screw section is located between the gear section and the sleeve section; the gear section is provided with a movable shaft hole matching the movable shaft; the reset spring is sleeved on the sleeve section, the cross-sectional dimension of the sleeve section is smaller than the cross-sectional dimension of the screw section, and the sleeve section matches the movable limiting hole.

[0014] In some embodiments, the fixed gear rod is provided with two adjusting knobs; the two adjusting knobs are respectively located at two ends of the fixed gear rod; the fixed gear rod and the adjusting knobs are connected by a bolt structure.

[0015] In some embodiments, a clamping block is detachably connected to both the left clamping arm and the right clamping arm.

[0016] According to the technical solution of the present invention, it includes a center positioning block, which is rotatably connected to a fixed gear rod, and the two ends of the fixed gear rod are provided with thread grooves in opposite directions. The two ends of the fixed gear rod are threadedly connected to a left clamping arm and a right clamping arm through the thread grooves. The left clamping arm and the right clamping arm are threadedly connected to the two ends of the fixed gear rod. The connection stability between the clamping arm and the fixed gear rod is good, and the overall structure of the clamp is also relatively simple; since the thread grooves at both ends of the fixed gear rod are in opposite directions, the displacement directions of the left clamping arm and the right clamping arm are also opposite when the fixed gear rod is rotated, and then, the distance between the left clamping arm and the right clamping arm can be adjusted by rotating the fixed gear rod. The advantage of this solution is that there is no need to replace different clamping blocks during use to meet the needs of clamping a larger range of pipe diameters. The Haval clamp can more widely cover the pipe diameter clamping needs of the welding gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, properties and advantages of the present application will become more apparent through the following description in conjunction with the accompanying drawings and embodiments. It should be noted that the drawings are only for illustration and are not drawn to scale, and should not be used to limit the scope of protection of the present application. Among them:

[0018] Figure 1 A three-dimensional diagram of the Harvard clamp of this application;

[0019] Figure 2 This is a front view of the Haval fixture of the present application with the top plate of the fixture removed;

[0020] Figure 3 A perspective view of the adjustment knob of the present application;

[0021] Figure 4 Schematic diagram of the gear transmission structure of the fixed gear rod and the movable gear rod of the present application;

[0022] Figure 5 This is a three-dimensional assembly diagram of the center positioning block of this application;

[0023] Figure 6 A perspective view of the fixed gear lever of the present application;

[0024] Figure 7 This is a front view of the transmission gear rod of this application;

[0025] Figure 8 This is a schematic diagram of the connection structure of the moving block of this application;

[0026] Figure 9 This is a schematic diagram of the structure of the movable gear lever of the present application;

[0027] Figure 10 This is a schematic diagram of the relevant structure of the clamp arm tension adjustment mechanism of this application;

[0028] Figure 11 This is a schematic diagram of the connection structure of the movable gear rod of the present application;

[0029] Figure 12 This is a front view of the fixture base plate of this application;

[0030] Figure 13 A three-dimensional diagram of the Haval clamp of the present application with the top plate of the clamp removed;

[0031] In the figure: 11, fixture bottom plate; 12, fixture top plate; 13, positioning groove; 14, limiting groove; 21, center positioning block; 211, first positioning block; 212, second positioning block; 213, first shaft hole; 2131, first bearing; 214, second shaft hole; 2141, second bearing; 215, movable shaft; 22, side end limiting block; 221, movable limiting hole; 31, fixed gear rod; 310, first gear; 311, fixed rotating shaft; 312, first fixed rod segment; 313, second fixed rod segment; 32, movable Moving gear rod; 320, second gear; 321, screw section; 322, gear section; 3221, movable shaft hole; 323, socket section; 33, transmission gear rod; 330, third gear; 331, transmission shaft; 41, left clamping arm; 42, right clamping arm; 43, moving block; 431, threaded hole; 5, clamping arm tension adjustment mechanism; 51, rotating shaft; 52, limiting column; 53, shifting block; 54, clamp wrench; 55, top block; 6, reset spring; 7, adjusting knob; 71, socket hole; 72, screw hole; 8, clamping block. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0033] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment herein. The appearance of such phrases in the specification does not necessarily refer to the same embodiment, nor does it limit mutually exclusive independent or alternative embodiments. Those skilled in the art will appreciate that an embodiment herein may be combined with other embodiments as long as no structural conflicts arise.

[0034] In the description herein, unless otherwise specified or limited, the technical terms "installed," "connected," and "connected" should be understood broadly, and may refer to movable connections, fixed connections, or integration. Those skilled in the art will understand the specific meanings of these terms in the embodiments of this application based on the specific circumstances.

[0035] In the description of this document, terms indicating orientation or positional relationships such as "up", "down", "left", "right", "height", "length", and "width" are intended to accurately describe the embodiments and simplify the description, but are not intended to limit the parts or structures involved to having a specific orientation, being installed or operated in a specific orientation.

[0036] See Figure 1 and Figure 2 , shown are respectively a three-dimensional view of the Haval clamp of the present application and a main view of the Haval clamp after removing the clamp top plate, the Haval clamp includes a clamp bottom plate 11 and a clamp top plate 12, a center positioning block 21 is provided between the clamp bottom plate 11 and the clamp top plate 12, the clamp bottom plate 11 and the clamp top plate 12 can prevent the center positioning block 21 and other components located therebetween from being impacted by the outside world, so that the clamp has a certain structural strength; the center positioning block 21 is rotatably connected to a fixed gear rod 31, and the two ends of the fixed gear rod 31 are provided with thread grooves in opposite directions, and the two ends of the fixed gear rod 31 are threadedly connected to a left clamp arm 41 and a right clamp arm 42 through the thread grooves, and the left clamp arm 41 and the right clamp arm 42 are threaded Connected to the two ends of the fixed gear rod 31, the connection stability of the clamping arm and the fixed gear rod 31 is good; further, since the thread grooves at the two ends of the fixed gear rod 31 are in opposite directions, when the fixed gear rod 31 is rotated, the left clamping arm 41 and the right clamping arm 42 can be displaced in opposite directions, so that the user can adjust the distance between the left clamping arm 41 and the right clamping arm 42 by rotating the fixed gear rod 31. The advantage of this solution is that the operation of adjusting the left clamping arm 41 and the right clamping arm 42 by rotating the fixed gear rod 31 is convenient, and the Haval clamp can cover the pipe diameter clamping requirements of the welding gun more widely, and there is no need to replace different clamping blocks 8 during use to meet the needs of clamping a larger range of pipe diameters.

[0037] The center positioning block 21 is also rotatably connected to two movable gear rods 32; both movable gear rods 32 are provided with thread grooves, specifically, the thread grooves on the fixed gear rod 31 and the movable gear rod 32 are the same size; the two movable gear rods 32 are symmetrically arranged on both sides of the center positioning block 21, or in other words, the thread grooves on the two movable gear rods 32 are in opposite directions, and the two movable gear rods 32 are respectively threadedly connected to the left clamping arm 41 and the right clamping arm 42 through the thread grooves, the fixed gear rod 31 and the movable gear rod 32 are engaged with each other through a gear structure and rotate synchronously, and when the fixed gear rod 31 rotates, the movable gear rod 32 and the fixed gear rod 31 rotates synchronously. Since the thread grooves on the fixed gear rod 31 and the movable gear rod 32 are the same size, and the thread grooves on the two movable gear rods 32 are in opposite directions, the movable gear rod 32 and the left clamping arm 41 or the right clamping arm 42 on the fixed gear rod 31 are displaced by the same distance and direction. The advantage of this solution is that, through the cooperation between the movable gear rod 32 and the fixed gear rod 31, the left clamping arm 41 and the right clamping arm 42 both have two connection points, and the movable gear rod 32 and the left clamping arm 41 or the right clamping arm 42 on the fixed gear rod 31 are displaced by the same distance and direction, which can increase the working stability of the left clamping arm 41 and the right clamping arm 42.

[0038] Preferably, in this embodiment, two adjusting knobs 7 are provided on the fixed gear rod 31, and the two adjusting knobs 7 are respectively located at the two ends of the fixed gear rod 31. The fixed gear rod 31 and the adjusting knob 7 are connected by a bolt structure. The advantage of this solution is that the fixed gear rod 31 can be driven to rotate synchronously by rotating the adjusting knob 7, which is more convenient to operate.

[0039] Preferably, in this embodiment, the left clamping arm 41 and the right clamping arm 42 are both detachably connected with a clamping block 8. The advantage of this solution is that when clamping metal pipes of different shapes, the clamping blocks 8 of different shapes and structures can be replaced.

[0040] See Figure 3 , shown is a three-dimensional diagram of the adjusting knob of the present application, the adjusting knob 7 is provided with a sleeve hole 71, the cross-section of the sleeve hole 71 is D-shaped, and a tolerance groove is provided at the corner of the D-shaped structure, and the adjusting knob 7 is sleeved on both ends of the fixed gear rod 31 through the sleeve hole 71; further, the adjusting knob 7 is also provided with a screw hole 72. After the adjusting knob 7 is sleeved on the fixed gear rod 31, a bolt is screwed into the screw hole 72 to lock the adjusting knob 7 and the fixed gear rod 31.

[0041] See Figure 4, shown is a schematic diagram of the gear transmission structure of the fixed gear rod and the movable gear rod of the present application. Regarding how the fixed gear rod 31 and the movable gear rod 32 are meshed and connected through the gear structure and rotate synchronously, the central positioning block 21 is also rotatably connected to the transmission gear rod 33. The transmission gear rod 33 is located between the fixed gear rod 31 and the movable gear rod 32. Two first gears 310 are provided on the fixed gear rod 31, and two second gears 320 are provided on the two movable gear rods 32. Two third gears 330 are provided on the transmission gear rod 33. The first gear 310 is meshed and transmitted with the second gear 320 through the third gear 330. Specifically, the two first gears 310 are respectively meshed with the two third gears 330, and the two third gears 330 are respectively meshed with the two second gears 320; wherein, A first gear 310, a second gear 320 and a third gear 330 are provided on both sides of the center positioning block 21. The advantage of this solution is that the center positioning block 21 is located between the two first gears 310, and the two first gears 310 cooperate to limit the fixed gear rod 31 and the center positioning block 21 relative to each other. Furthermore, the center positioning block 21 is located between the two third gears 330, and the two third gears 330 cooperate to limit the fixed gear rod 31 and the center positioning block 21 relative to each other; wherein, in the gear structure, the first gear 310 and the second gear 320 have the same size. The advantage of this solution is that through the cooperation of the first gear 310, the second gear 320 and the third gear 330, the fixed gear rod 31 and the movable gear rod 32 can be engaged and connected and rotate synchronously.

[0042] See Figure 5 , shown is a three-dimensional assembly diagram of the center positioning block of the present application, the center positioning block 21 includes a first positioning block 211 and a second positioning block 212, the first positioning block 211 and the second positioning block 212 are detachably connected, and the center positioning block 21 is provided with a first shaft hole 213 and a second shaft hole 214. Specifically, after the first positioning block 211 and the second positioning block 212 are separated, the first shaft hole 213 has the same proportion in the first positioning block 211 and the second positioning block 212, and the second shaft hole 214 has the same proportion in the first positioning block 211 and the second positioning block 212; further, the first A first bearing 2131 rotatably connected to the fixed gear rod 31 is provided in the shaft hole 213, and a second bearing 2141 rotatably connected to the transmission gear rod 33 is provided in the second shaft hole 214. By providing the bearings, the rotational damping of the fixed gear rod 31 and the transmission gear rod 33 can be reduced, and the working stability of the fixed gear rod 31 and the transmission gear rod 33 can be increased; the advantage of this solution is that by providing the bearings, the fixed gear rod 31 and the transmission gear rod 33 can be avoided from directly contacting the center positioning block 21, and the operation of replacing the bearings is more convenient through the detachable structure of the center positioning block 21.

[0043] Preferably, in this embodiment, a movable shaft 215 is provided on the central positioning block 21 .

[0044] See Figure 6 , shown is a three-dimensional view of the fixed gear rod of the present application, the fixed gear rod 31 includes two first gears 310, a fixed rotating shaft 311, two first fixed rod segments 312 and two second fixed rod segments 313; the fixed rotating shaft 311 is located between the two first gears 310, the two first gears 310 are located between the two first fixed rod segments 312, and the two first fixed rod segments 312 are located between the two second fixed rod segments 313; the fixed rotating shaft 311 is matched with the first bearing 2131, and the fixed bearing is installed on the central positioning block 21, so that the fixed gear rod 31 is rotatably connected to the central positioning block 21; the two first gears 310 have been described in the above gear structure; the thread groove of the fixed gear rod 31 is provided on the first fixed rod segment 312, specifically, the thread grooves provided on the two first fixed rod segments 312 are arranged in opposite directions; the two second fixed rod segments 313 are respectively located at both ends of the fixed gear rod 31, specifically, the cross-sectional dimension of the second fixed rod segment 313 is smaller than the cross-sectional dimension of the first fixed rod segment 312.

[0045] See Figure 7 , shown is the main view of the transmission gear rod of the present application, the transmission gear rod 33 includes two third gears 330 and a transmission shaft 331; the two third gears 330 are located at both ends of the transmission gear rod 33, and the transmission shaft 331 is located between the two third gears 330; the transmission shaft 331 is matched with the second bearing 2141, and the transmission shaft 331 is installed on the center positioning block 21, so that the transmission gear rod 33 is rotatably connected to the center positioning block 21; the two third gears 330 have been described in the above gear structure.

[0046] See Figure 8 , shown is a schematic diagram of the connection structure of the moving block of the present application, two moving blocks 43 are detachably connected to the left clamping arm 41 and the right clamping arm 42, and the moving blocks 43 are provided with threaded holes 431 matching the thread grooves, wherein the two moving blocks 43 rotatably connected to the left clamping arm 41 or the right clamping arm 42 are respectively threadedly connected to the fixed gear rod 31 and the movable gear rod 32 through the thread grooves, and the moving blocks 43 are detachable and replaceable; the moving blocks 43 are threadedly connected to the fixed gear rod 31 or the movable gear rod 32, and the moving blocks 43 are rotatably connected to the left clamping arm 41 or the right clamping arm 42. Specifically, when the fixed gear rod 31 does not rotate and the two movable gear rods 32 are displaced away from each other, the left clamping arm 41 and the right clamping arm 42 can cooperate to clamp or release the clamped material.

[0047] See Figure 9, shown is a schematic diagram of the relevant structure of the movable gear rod of the present application, two side limit blocks 22 are also provided between the clamp bottom plate 11 and the clamp top plate 12, and the two side limit blocks 22 are respectively located on both sides of the center positioning block 21, specifically, the two side limit blocks 22 are respectively located at both ends of the clamp bottom plate 11; a clamp arm tension adjustment mechanism 5 is provided between the two movable gear rods 32, and the clamp arm tension adjustment mechanism 5 is used to adjust the distance between the two movable gear rods 32. Furthermore, a reset spring 6 is provided between the movable gear rod 32 and the adjacent side limit blocks 22, and the reset spring 6 is used to reset the distance between the two movable gear rods 32. The two movable gear rods 32 are displaced by cooperating with the clamp arm tension adjustment mechanism 5 and the reset spring 6. Combined with the above-mentioned moving block 43 scheme, the two clamp arms can clamp or release the clamped material.

[0048] See Figure 10 , shown is a schematic diagram of the relevant structure of the clamp arm tension adjustment mechanism of the present application, with respect to the clamp arm tension adjustment mechanism 5, a rotating shaft 51, two limiting columns 52 and two shifting blocks 53 are further provided between the clamp bottom plate 11 and the clamp top plate 12, and the clamp arm tension adjustment mechanism 5 includes a clamp wrench 54 and a top block 55; the clamp wrench 54 is rotatably connected to the rotating shaft 51, and the structure of the clamp wrench 54 is L-shaped, and the turning point of the L-shaped clamp wrench 54 is rotatably connected to the rotating shaft 51; the top block 55 is installed on the clamp wrench 54 On the top, the structure of the top block 55 is T-shaped, and the top block 55 is rotatably connected to the clamp wrench 54; the two shift blocks 53 are limited between the two limit columns 52, and the two shift blocks 53 are symmetrically arranged on both sides of the top block 55, and the turning point of the shift block 53 and the line connecting the two ends form a triangle; by pulling the clamp wrench 54 to drive the top block 55 to move, the displacement of the top block 55 drives the two shift blocks 53 to rotate, and the rotation of the two shift blocks 53 drives the two movable gear rods 32 to move, thereby causing the left clamping arm 41 and the right clamping arm 42 to clamp or release the clamped material.

[0049] Preferably, in this embodiment, the shift block 53 is provided with a sliding groove matching the movable shaft 215 , the sliding groove is located at the lower end of the shift block 53 , and the sliding groove cooperates with the movable shaft 215 to limit the movement path of the shift block 53 .

[0050] See Figure 11, shown is a schematic diagram of the connection structure of the movable gear rod of the present application, wherein a movable shaft rod 215 is provided on the central positioning block 21, and the movable shaft rod 215 is located at the upper end of the central positioning block 21; a movable limiting hole 221 is provided on the side end limiting block 22; the movable gear rod 32 includes a screw section 321, a gear section 322 and a sleeve section 323, and the screw section 321 is located between the gear section 322 and the sleeve section 323; a thread groove of the movable gear rod 32 is provided on the screw section 321, and the movable block 43 is threadedly connected to the screw section 321 of the movable gear rod 32; The wheel section 322 is provided with a movable shaft hole 3221 that matches the movable shaft rod 215. The movable shaft rod 215 can be inserted into and slidably connected to the movable shaft hole 3221, thereby making the movable gear rod 32 slidably connected to the center positioning block 21; the return spring 6 is sleeved on the sleeve section 323, and the cross-sectional size of the sleeve section 323 is smaller than the cross-sectional size of the screw section 321. The sleeve section 323 matches the movable limit hole 221, and the side end limit block 22 is sleeved on the movable gear rod 32, and the movable gear rod 32 is limited between the center positioning block 21 and the side end limit block 22.

[0051] See Figure 12 , shown is the main view of the clamp base plate of the present application, wherein the clamp base plate 11 and the clamp top plate 12 are connected by a bolt structure, wherein the structures of the clamp base plate 11 and the clamp top plate 12 are symmetrical to each other; a positioning groove 13 and a limiting groove 14 are provided on the clamp base plate 11, with respect to the positioning groove 13, the positioning groove 13 matches the center positioning block 21, the end cross section of the center positioning block 21 matches the cross section of the positioning groove 13, the center positioning block 21 can be inserted into the positioning groove 13 and limited between the two positioning grooves 13, with respect to the limiting groove 14, the limiting groove 14 matches the top block 55, and the two limiting grooves 14 cooperate to limit the movement path of the top block 55.

[0052] See Figure 13 , shown is a three-dimensional view of the Haval clamp of the present application after the clamp top plate is removed. The user should pull the clamp wrench 54 to put the left clamp arm 41 and the right clamp arm 42 in a loose state, and then turn the adjustment knob 7 to adjust the distance between the left clamp arm 41 and the right clamp arm 42. When the left clamp arm 41 and the right clamp arm 42 are respectively in contact with the two sides of the material to be clamped, the user pulls the clamp wrench 54 again to clamp the left clamp arm 41 and the right clamp arm 42 to clamp the material to be clamped.

[0053] The purpose of the above embodiments is to provide a detailed description of the present invention in conjunction with the accompanying drawings so that those skilled in the art can understand the technical concept of the present invention. Within the scope of the claims of the present invention, optimization or equivalent replacement of the involved component structures, as well as the combination of implementation methods in different embodiments without causing any structural or principle conflicts, all fall within the scope of protection of the present invention.

Claims

1. A Haval clamp, characterized in that: It includes a center positioning block (21), wherein the center positioning block (21) is rotatably connected to a fixed gear rod (31); The two ends of the fixed gear rod (31) are provided with thread grooves in opposite directions, and the two ends of the fixed gear rod (31) are threadedly connected to a left clamping arm (41) and a right clamping arm (42) through the thread grooves. The distance between the left clamping arm (41) and the right clamping arm (42) can be adjusted by rotating the fixed gear rod (31).

2. The Haver clamp according to claim 1, characterized in that: The central positioning block (21) is also rotatably connected to two movable gear rods (32); The two movable gear rods (32) are both provided with thread grooves; The thread grooves on the fixed gear rod (31) and the movable gear rod (32) have the same size; The two movable gear rods (32) are symmetrically arranged on both sides of the central positioning block (21), and the two movable gear rods (32) are respectively threadedly connected to the left clamping arm (41) and the right clamping arm (42) through thread grooves; The fixed gear rod (31) and the movable gear rod (32) are meshed and connected via a gear structure and rotate synchronously.

3. The Haver clamp according to claim 2, characterized in that: The central positioning block (21) is also rotatably connected to a transmission gear rod (33); The transmission gear rod (33) is located between the fixed gear rod (31) and the movable gear rod (32); The fixed gear rod (31) is provided with two first gears (310), the two movable gear rods (32) are each provided with a second gear (320), and the transmission gear rod (33) is provided with two third gears (330); The first gear (310) is meshed with the second gear (320) for transmission via the third gear (330); The first gear (310) and the second gear (320) have the same size.

4. The Haver clamp according to claim 3, characterized in that: The central positioning block (21) comprises a first positioning block (211) and a second positioning block (212); The first positioning block (211) and the second positioning block (212) are detachably connected; The center positioning block (21) is provided with a first axial hole (213) and a second axial hole (214); A first bearing (2131) rotatably connected to the fixed gear rod (31) is provided in the first shaft hole (213); A second bearing (2141) rotatably connected to the transmission gear rod (33) is provided in the second shaft hole (214).

5. The Haver clamp according to claim 2, characterized in that: The left clamping arm (41) and the right clamping arm (42) are both detachably and rotatably connected to two moving blocks (43); The moving block (43) is provided with a threaded hole (431) matching the threaded groove; The two moving blocks (43) rotatably connected to the left clamping arm (41) or the right clamping arm (42) are respectively threadedly connected to the fixed gear rod (31) and the movable gear rod (32) through thread grooves.

6. The Haver clamp according to claim 5, characterized in that: Also includes two side end limit blocks (22); The two side end limit blocks (22) are respectively located on both sides of the central positioning block (21); A clamping arm tightness adjustment mechanism (5) is provided between the two movable gear rods (32); The clamp arm tightness adjustment mechanism (5) is used to adjust the distance between the two movable gear rods (32); A return spring (6) is provided between the movable gear rod (32) and the adjacent side end limit block (22); The return spring (6) is used to return the distance between the two movable gear rods (32).

7. The Haver clamp according to claim 6, characterized in that: It also includes a rotating shaft (51), two limiting columns (52) and two shifting blocks (53); The clamp arm tightness adjustment mechanism (5) comprises a clamp wrench (54) and a top block (55); The clamp wrench (54) is rotatably connected to the rotating shaft (51); The top block (55) is mounted on the fixture wrench (54), the two shift blocks (53) are limited between the two limit columns (52), and the two shift blocks (53) are symmetrically arranged on both sides of the top block (55); The top block (55) is driven to move by pulling the clamp wrench (54), and the displacement of the top block (55) drives the two shifting blocks (53) to rotate, and the rotation of the two shifting blocks (53) drives the two movable gear rods (32) to move.

8. The Haver clamp according to claim 6, characterized in that: The central positioning block (21) is provided with a movable shaft (215); The side end limiting block (22) is provided with a movable limiting hole (221); The movable gear rod (32) comprises a screw section (321), a gear section (322) and a sleeve section (323); The screw section (321) is located between the gear section (322) and the sleeve section (323); The gear segment (322) is provided with a movable shaft hole (3221) matching the movable shaft rod (215); The return spring (6) is sleeved on the sleeve section (323); the cross-sectional dimension of the sleeve section (323) is smaller than the cross-sectional dimension of the screw section (321); and the sleeve section (323) matches the movable limiting hole (221).

9. The Haver clamp according to claim 1, characterized in that: The fixed gear rod (31) is provided with two adjustment knobs (7); The two adjusting knobs (7) are respectively located at the two ends of the fixed gear rod (31); The fixed gear rod (31) and the adjusting knob (7) are connected by a bolt structure.

10. The Haver clamp according to claim 1, characterized in that: The left clamping arm (41) and the right clamping arm (42) are both detachably connected to a clamping block (8).

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