A clamping device with adjustable clamping force

Abstract

The utility model relates to a kind of clamping devices of adjustable clamping force, including fixed head, it is equipped with through slot, two clamps are hinged to fixed head;Fixed head is equipped with through hole, two clamps are equipped with clamping hole, and clamping block is placed into two clamping holes and the up-down direction of two clamping holes is with the clearance of clamping block;Clamping block is equipped with threaded hole;Screw rod is equipped with threaded section and clamping section, threaded section is passed through through hole and is connected with threaded hole screw thread, and clamping section is connected with the bottom surface of through hole;Fixed head and clamp are equipped with first adapter hole and second adapter hole.In the utility model, set screw rod and clamping block screw connection, clamping block and the clamping hole of two clamps abut, adjust the spacing between screw rod and clamping block can adjust two clamps to hold or open, and screw rod and clamping block can fine tune spacing, to accurately adjust the clamping force of clamping device according to actual demand, avoid clamping device to fall off due to clamping too loose, or damage table board, support and other clamped objects due to clamping too tight.

Description

Technical Field

[0001] This utility model belongs to the technical field of photographic equipment, specifically relating to a clamping device with adjustable clamping force. Background Technology

[0002] Crab claw clamps and other photographic clamps are common tools used to secure cameras, flashes, fill lights, monitors, and other photographic equipment. Typically, these clamps provide interfaces for common photographic equipment on one or more sides, allowing connection to other devices for operation. Alternatively, the clamp can be directly integrated with the photographic equipment, and when the desired equipment is needed, it is held in place. Photographic clamps are practical photographic aids that help photographers flexibly secure and adjust their equipment in various scenarios.

[0003] For example, Chinese invention patent (authorization announcement number: CN105402576A) discloses a photographic clip, including: a clip body and a tripod head; the clip body includes a clamp plate and a handle; the tripod head is fixedly connected to the handle of the clip body, and the tripod head includes a platform and a connecting body disposed at the top of the platform for connecting equipment; the connecting body includes a rotatable rotating body disposed within the top end face of the platform, and a screw connected to the rotatable body for connecting equipment. A connecting surface is provided at the connection between the clamp plate portion and the handle portion of each clip unit. Each clip unit specifically includes two opposing connecting surfaces, and two clip units are connected by a connecting rod that passes laterally through the connecting surfaces. A support spring is provided on the connecting rod, and the clip is a helical torsion spring clip. When using the photographic clip to install or fix photographic equipment, the photographic equipment is fixedly connected to the clip tripod head, and the clamp is used to clamp it to the installation or fixing position to install or fix the photographic equipment. The photographic clip described in this invention can conveniently install or fix photographic equipment to the required location, meeting the application needs in this field. Furthermore, the screw angle is adjustable, making it widely applicable, with strong clamping force, good stability, and high practicality.

[0004] However, the clamp of the above invention is a helical torsion spring clamp. The clamping force is provided by the spring, and the clamping force is not adjustable. It is easy for the clamp to be too loose, causing the equipment to fall off, or too tight, damaging the clamped table, bracket, or other objects. It cannot be flexibly adjusted according to the specific usage situation.

[0005] Therefore, it is necessary to design a new solution to address the aforementioned problems. Utility Model Content

[0006] The purpose of this invention is to provide a clamping device with adjustable clamping force to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides an adjustable clamping force clamping device, including a fixing head, the fixing head having a head portion, the head portion extending upwards into two vertical blocks, the space between the two vertical blocks forming a through groove, the bottom of the through groove being a plane;

[0008] It also includes two clamp blocks, each with a connecting part at its bottom end. The two connecting parts are respectively inserted into the two ends of the horizontal direction of the through groove. Fixed head hinge holes are opened at both ends of the horizontal direction of the two side walls of the through groove. The two connecting parts are respectively aligned with the fixed head hinge holes and have clamp block hinge holes. Two hinge rods are respectively installed in the fixed head hinge holes through the two clamp block hinge holes, so that the two clamp blocks are respectively hinged to the two hinge rods and can rotate around the two hinge rods, so that the ends of the two clamp blocks away from the connecting parts are brought closer to each other or moved away from each other.

[0009] The two clamping blocks are provided with a first clamping part and a second clamping part. The first clamping part is connected to the connecting part and the second clamping part respectively. The second clamping part forms an angle with the first clamping part. The two opposing first clamping parts and the two opposing second clamping parts form a clamping space. When the two clamping blocks clamp, the two opposing second clamping parts close together.

[0010] The fixing head has a through hole that passes through the bottom of the through groove and the bottom surface of the head. The two connecting parts have snap-fit ​​holes facing each other. The snap-fit ​​block is placed into the space formed by the two snap-fit ​​holes, and the two snap-fit ​​holes are not gapped with the snap-fit ​​block in the vertical direction. The spiral rod passes through the through hole and is connected to the snap-fit ​​block. The snap-fit ​​block has a threaded through hole. The spiral rod has a threaded section and a snap-fit ​​section. The threaded section is threadedly connected to the threaded through hole, and the snap-fit ​​section is snapped with the bottom surface of the through hole.

[0011] The fixing head has a first adapter hole and a second adapter hole on the two outer sides of the through groove sidewall, and the clamp has a first adapter hole and a second adapter hole on the back of the first clamping part, and a first adapter hole on the two sides perpendicular to the first clamping part.

[0012] Optionally, the two connecting parts are provided with clearance grooves, the two clearance grooves are respectively connected to the two snap-fit ​​holes, and the two clearance grooves are in a clearance relationship with the spiral rod.

[0013] Optionally, a first countersunk hole is provided at the bottom of the through groove of the fixed head, extending downward from the through hole opening. One end of the elastic member abuts against the bottom of the first countersunk hole, and the other end abuts against the bottom surface of the two connecting parts.

[0014] The elastic element is sleeved on the helical rod and is not exposed to the helical rod.

[0015] Optionally, both the first clamping part and the second clamping part are provided with anti-slip grooves, and anti-slip pads are installed in the anti-slip grooves.

[0016] Optionally, the surface of the anti-slip mat is provided with granular protrusions.

[0017] Optionally, a knob is installed at one end of the screw rod where the snap-fit ​​section is located, and the screw rod has a mounting section at the end of the shaft section. The mounting section has several straight surfaces, and the knob has an anti-rotation hole that is adapted to the periphery of the mounting section.

[0018] The end face of the mounting section is provided with a mounting section hole, and a locking rod is detachably connected to the mounting section hole. The radial dimension of the head of the locking rod is larger than that of the anti-rotation hole, and the head of the locking rod limits the knob.

[0019] The locking rod head is provided with an internal hexagonal hole.

[0020] Optionally, the knob has a second countersunk hole at the opening of the anti-rotation hole, the bottom surface of the second countersunk hole is aligned with the end face of the mounting section hole, and the head of the locking rod is accommodated in the second countersunk hole.

[0021] Optionally, a washer is provided between the bottom surface of the head and the snap-fit ​​section, the washer being sleeved on the spiral rod, and the washer abutting against the bottom surface of the head and the snap-fit ​​section respectively.

[0022] Optionally, the end face of the threaded segment is provided with a threaded segment hole, and the threaded segment hole is detachably connected to a limit rod;

[0023] The head of the limit rod has an internal hexagonal hole.

[0024] Optionally, the threads of the threaded segment and the threaded through hole are right-hand threads.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0026] In this utility model, a spiral rod is threadedly connected to a clamping block, and the clamping block abuts against the clamping holes of the two clamping blocks. Adjusting the distance between the spiral rod and the clamping block can adjust the clamping or opening of the two clamping blocks. Furthermore, the distance between the spiral rod and the clamping block can be finely adjusted to precisely adjust the clamping force of the clamping device according to actual needs, so as to avoid the clamping device from falling off due to excessively loose clamping or damaging the clamped objects such as the table or bracket due to excessively tight clamping. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 An exploded view of the adjustable clamping force clamping device provided in the embodiment of this utility model;

[0029] Figure 2 An enlarged schematic diagram of the fixing head provided in an embodiment of this utility model;

[0030] Figure 3 Another enlarged view of the fixing head provided in an embodiment of this utility model;

[0031] Figure 4 An enlarged schematic diagram of the clamp block provided in an embodiment of this utility model;

[0032] Figure 5 Another enlarged view of the clamp block provided in an embodiment of this utility model;

[0033] Figure 6 An enlarged schematic diagram of the card block provided in an embodiment of this utility model;

[0034] Figure 7 An enlarged schematic diagram of the screw rod provided in an embodiment of this utility model;

[0035] Figure 8 Another enlarged view of the screw rod provided in an embodiment of this utility model;

[0036] Figure 9 An enlarged schematic diagram of the knob provided in an embodiment of this utility model;

[0037] Figure 10 A top enlarged view of the clamping device with adjustable clamping force provided in the embodiment of this utility model in the open state;

[0038] Figure 11 for Figure 10 Sectional view at point AA;

[0039] Figure 12 A top-view enlarged view of the clamping state of the adjustable clamping force clamping device provided in an embodiment of the present utility model;

[0040] Figure 13 for Figure 12 Sectional view at point BB.

[0041] The following are the labeling elements in the figure:

[0042] Fixing component 1, fixing head 11, head 111, through groove 1111, fixing head hinge hole 1112, through hole 1113, first countersunk hole 1114, hinge rod 12;

[0043] Clamping assembly 2, clamping block 21, connecting part 211, clamping block hinge hole 2111, snap-fit ​​hole 2112, clearance groove 2113, first clamping part 212, second clamping part 213, anti-slip pad groove 214, anti-slip pad 22, protrusion 221.

[0044] Tightening adjustment assembly 3, screw rod 31, threaded section 311, threaded section hole 3111, snap-fit ​​section 312, mounting section 313, mounting section hole 3131, limit rod 32, limit rod head 321, locking block 33, threaded through hole 331, elastic element 34, washer 35, knob 36, anti-rotation hole 361, second countersunk hole 362, locking rod 37, locking rod head 371;

[0045] First adapter hole 41, second adapter hole 42. Detailed Implementation

[0046] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0047] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0050] In one embodiment of this utility model, such as Figure 1 As shown, an adjustable clamping force clamping device is provided, including a fixing component 1, a clamping component 2, and a screw-adjusting component 3. The fixing component 1 is used to hinge the clamping component 2 and mount the screw-adjusting component 3. The fixing component 1 includes a fixing head 11 and a hinge rod 12. The clamping component 2 is used to clamp onto objects such as tables or brackets to fix and support photographic equipment mounted thereon. The clamping component 2 includes two clamping blocks 21 and an anti-slip pad 22. The screw-adjusting component 3 is used to adjust and control the clamping and fixing or loosening of the clamping component 2. The screw-adjusting component 3 includes a screw rod 31, a limiting rod 32, a locking block 33, an elastic element 34, a washer 35, a knob 36, and a locking rod 37.

[0051] like Figures 2-5 As shown, the fixing head 11 has a head 111, from which two symmetrical vertical blocks extend upwards. The space between the two vertical blocks forms a through groove 1111, and the bottom of the through groove 1111 is flat. The two clamping blocks 21 have a symmetrical structure, and the bottom of the two clamping blocks 21 has a connecting part 211. The two connecting parts 211 are respectively placed into the two ends of the through groove 1111 in the horizontal direction. The two side walls of the through groove 1111 have fixing head hinge holes 1112 symmetrically opened at the two ends of the horizontal direction. The two connecting parts 211 are respectively aligned with the fixing head hinge holes 1112 to form clamping block hinge holes 2111. The two hinge rods 12 are respectively installed in the fixing head hinge holes 1112 through the two clamping block hinge holes 2111, so that the two clamping blocks 21 are respectively hinged to the two hinge rods 12 and can rotate around the two hinge rods 12, so that the ends of the two clamping blocks 21 away from the connecting parts 211 move closer to each other or further away from each other, thereby performing clamping or releasing actions.

[0052] like Figure 4 , Figure 11 and Figure 13As shown, the two clamping blocks 21 are provided with a first clamping part 212 and a second clamping part 213. The first clamping part 212 is connected to the connecting part 211 and the second clamping part 213 respectively. The parts of the first clamping part 212 and the second clamping part 213 that contact the object being clamped are both planes. The second clamping part 213 forms an angle with the first clamping part 212, so that when clamping objects such as round tubes, the four planes of the two clamping blocks 21 (the four planes of the clamping parts that contact the object being clamped) wrap around the arc surface of the object being clamped at different angles, making the clamping more secure. The two opposing first clamping parts 212 and the two opposing second clamping parts 213 form a clamping space. When the two clamping blocks 21 clamp, the two opposing second clamping parts 213 close together.

[0053] Both the first clamping part 212 and the second clamping part 213 are provided with anti-slip pad grooves 214, and anti-slip pads 22 are installed in the anti-slip pad grooves 214. The back of the anti-slip pads 22 are usually glued to the bottom of the anti-slip pad grooves 214. The surface of the anti-slip pads 22 has granular protrusions 221. The anti-slip pads 22 are rubber pads used to prevent scratching the clamped objects and increase friction for a stable anti-slip effect.

[0054] like Figure 2 , Figure 4 , Figure 6 , Figure 7 , Figure 11 and Figure 13 As shown, the fixing head 11 has a through-hole 1113 at the bottom of the through groove 1111 and the bottom surface of the head 111. The two connecting parts 211 have locking holes 2112 facing each other. The locking block 33 is placed into the space formed by the two locking holes 2112, and the two locking holes 2112 are not aligned with the locking block 33 in the vertical direction, so that the locking block 33 can move up and down a certain distance in a direction perpendicular to the plane formed by the axis of the two locking holes 2111. The spiral rod 31 passes through the through hole 1113 and connects with the locking block 33. Specifically, the locking block 33 has a threaded through hole 331. The spiral rod 31 has a threaded section 311 and a locking section 312. The threaded section 311 is threadedly connected to the threaded through hole 331. The locking section 312 is an annular protrusion. The diameter of the locking section 312 is larger than the diameter of the through hole 1113. The locking section 312 engages with the bottom surface of the through hole 1113 for limiting the position. By turning the screw rod 31, the locking block 33 moves up and down. The locking block 33 presses against the two locking holes 2112, causing the two clamping blocks 21 to rotate around their respective hinge rods 12 to perform clamping or releasing actions.

[0055] Specifically, the threads of the threaded section 311 and the threaded through hole 331 are right-hand threads. When the helical rod 31 is turned to the left, the two clamping blocks 21 are loosened and opened, and when it is turned to the right, the two clamping blocks 21 are closed and tightened. This conforms to the common sense and habit of "left loose, right tight" and is convenient to use.

[0056] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the fixing head 11 has a first adapter hole 41 and a second adapter hole 42 respectively on the two outer sides of the sidewall of the through groove 1111. The clamp block 21 has a first adapter hole 41 and a second adapter hole 42 on the back of the first clamping part 212, and a first adapter hole 41 on the two sides perpendicular to the first clamping part 212. The two adapter holes are two different threaded holes, used to install adapter devices such as magic hands to connect other photographic equipment for photography. Specifically, the first adapter hole 41 is a 1 / 4 inch threaded hole, and the second adapter hole 42 is a 3 / 8 inch threaded hole. Multiple adapter holes are provided to meet a variety of photographic needs.

[0057] Furthermore, such as Figure 4 and Figure 11 As shown, the two connecting parts 211 are provided with clearance grooves 2113, which are connected to the two snap-fit ​​holes 2112 in the vertical direction, respectively, and the clearance grooves 2113 are not exposed to the screw rod 31. By providing clearance grooves 2113 and screw rod 31 at the connecting parts 211 of the two clamping blocks 21, the two clamping blocks 21 can perform clamping and opening actions. At the same time, one end of the two connecting parts 211 is closer together, making the structure more compact and thus making the clamping device smaller.

[0058] Furthermore, such as Figure 2 , Figure 4 and Figure 11 As shown, a first countersunk hole 1114 is formed at the bottom of the through hole 1113, extending downwards from the bottom of the groove 1111 of the fixed head 11. The diameter of the first countersunk hole 1114 is larger than the diameter of the through hole 1113. One end of the elastic element 34 abuts against the bottom of the first countersunk hole 1114, and the other end abuts against the bottom surface area adjacent to the two connecting parts 211. The elastic element 34 is sleeved on the screw rod 31, and the diameter of the hollow hole in the elastic element 34 is larger than the outer perimeter of the screw rod 31, thus avoiding any gap between the elastic element 34 and the screw rod 31. The elastic element 34 is specifically a conical spring.

[0059] Specifically, by turning the screw rod 31, the locking block 33 rotates and moves up and down in the threaded section 311. When the locking block 33 moves downward, it presses down against the two locking holes 2112, causing the two clamping blocks 21 to rotate around the hinge rod 12 to close and come together, thereby completing the clamping action; when the locking block 33 moves upward, it releases the downward pressure on the two locking holes 2112, and at the same time, the elastic element 34 also pushes upward against the adjacent bottom surfaces of the connecting part 211 of the two clamping blocks 21, causing the two clamping blocks 21 to rotate around the hinge rod 12 to gradually open. The elastic element 34 pushes against the two clamping blocks 21 to open them, which plays a role in assisting in opening the clamping device.

[0060] Furthermore, such as Figure 7 and Figure 11As shown, the end face of the threaded section 311 has a threaded section hole 3111, which is detachably connected to a limit rod 32. The head 321 of the limit rod has an internal hexagonal hole for easy disassembly and assembly using tools such as an internal hexagonal wrench. The radial dimension of the head 321 of the limit rod is larger than the diameter of the threaded through hole 331, which is used to limit the movement of the locking block 33 towards the top of the threaded section 311, so as to prevent over-tightening when the two clamping blocks 21 are opened and the screw rod 31 is tightened, causing the screw rod 31 to disengage from the locking block 33. Specifically, the threaded section hole 3111 is a threaded hole, and the limit rod 32 is a countersunk screw.

[0061] Furthermore, such as Figure 1 , Figure 7 and Figure 11 As shown, a washer 35 is provided between the bottom surface of the head 111 of the fixing head 11 and the snap-fit ​​section 312. The washer 35 is fitted onto the screw rod 31, and the washer 35 abuts against the bottom surface of the head 111 and the snap-fit ​​section 312 respectively. The fixing head 11 and the screw rod 31 are generally made of metal, and the washer 35 is generally made of rubber. The washer 35 is provided to prevent scratching of the contact area with the head 111 when the screw rod 31 is turned.

[0062] Furthermore, such as Figure 1 , Figure 8 , Figure 9 and Figure 11 As shown, a knob 36 is installed at the end of the screw rod 31 where the snap-fit ​​section 312 is located, for assisting in turning the screw rod 31. The screw rod 31 has a mounting section 313 at its end shaft. The surface of the mounting section 313 has six symmetrical straight surfaces, and the axial cross-section of the mounting section 313 is a regular hexagon. The knob 36 has an anti-rotation hole 361 that fits the periphery of the mounting section 313, for mounting the knob 36 on the mounting section 313 and preventing rotation. The end face of the mounting section 313 has a mounting section hole 3131, which is detachably connected to a locking rod 37. The radial dimension of the locking rod head 371 is larger than the radial dimension of the anti-rotation hole 361. After the locking rod 37 is installed into the mounting section hole 3131, the locking rod head 371 can limit and lock the knob 36, keeping the knob 36 fixed to the screw rod 31. The locking rod head 371 has an internal hexagonal hole for easy disassembly and assembly using tools such as an internal hexagonal wrench. Specifically, the mounting hole 3131 is a threaded hole, and the locking rod 37 uses a flat-head screw.

[0063] The knob 36 has a second countersunk hole 362 at the opening of the anti-rotation hole 361. The bottom surface of the second countersunk hole 362 is aligned with the end face of the mounting section hole 3131. The depth of the second countersunk hole 362 is greater than the axial dimension of the locking rod head 371, and the diameter of the second countersunk hole 362 is greater than the radial dimension of the locking rod head 371. This allows the locking rod head 371 to be accommodated within the second countersunk hole 362 after the locking rod 37 is installed into the mounting section hole 3131. Consequently, the hand is not hindered by the locking rod 37 when turning the knob 36, making it more effortless and comfortable. Specifically, the knob 36 is a long strip structure with flat ends and an elliptical protrusion in the middle, which makes it easier and more comfortable for the fingers and palm to grip when turning, and is more ergonomic.

[0064] The working principle of the adjustable clamping force clamping device in this invention is as follows:

[0065] like Figure 11 As shown, the clamping device is in the open state. During clamping, turning the knob 36 clockwise drives the screw rod 31 to rotate. The threaded section 311 rotates through the threaded through hole 331 of the locking block 33, causing the locking block 33 to move downward and press against the locking holes 2112 of the two clamping blocks 21, causing the two clamping blocks 21 to rotate around the hinge rod 12. This causes the two second clamping parts 213 to close together and the distance between the two first clamping parts 212 to shorten, thus clamping objects such as tabletops and supports. The limit of the two clamping blocks 21 closing during clamping is that the parts of the two second clamping parts 213 near the top abut against each other. Figure 13 As shown.

[0066] When the clamps are released and the two clamping blocks 21 open, turn the knob 36 to the left. The locking block 33 moves upward, and the elastic element 34 pushes upward elastically against the adjacent bottom areas of the connecting part 211 of the two clamping blocks 21. The two clamping blocks 21 rotate around the hinge rod 12 and gradually open until they are as described above. Figure 11 As shown. When the locking block 33 abuts against the head 321 of the limiting rod, the user receives a signal that it has been turned to the limit position and stops turning to the left to avoid over-tightening and causing the screw rod 31 to disengage from the locking block 33.

[0067] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A clamping device with adjustable clamping force, characterized in that: Includes a fixing head, the fixing head having a head, the head extending upwards into two vertical blocks, the space between the two vertical blocks forming a through groove, the bottom of the through groove being a plane; It also includes two clamp blocks, each with a connecting part at its bottom end. The two connecting parts are respectively inserted into the two ends of the horizontal direction of the through groove. Fixed head hinge holes are opened at both ends of the horizontal direction of the two side walls of the through groove. The two connecting parts are respectively aligned with the fixed head hinge holes and have clamp block hinge holes. Two hinge rods are respectively installed in the fixed head hinge holes through the two clamp block hinge holes, so that the two clamp blocks are respectively hinged to the two hinge rods and can rotate around the two hinge rods, so that the ends of the two clamp blocks away from the connecting parts are brought closer to each other or moved away from each other. The two clamping blocks are provided with a first clamping part and a second clamping part. The first clamping part is connected to the connecting part and the second clamping part respectively. The second clamping part forms an angle with the first clamping part. The two opposing first clamping parts and the two opposing second clamping parts form a clamping space. When the two clamping blocks clamp, the two opposing second clamping parts close together. The fixing head has a through hole that passes through the bottom of the through groove and the bottom surface of the head. The two connecting parts have snap-fit ​​holes facing each other. The snap-fit ​​block is placed into the space formed by the two snap-fit ​​holes, and the two snap-fit ​​holes are not gapped with the snap-fit ​​block in the vertical direction. The spiral rod passes through the through hole and is connected to the snap-fit ​​block. The snap-fit ​​block has a threaded through hole. The spiral rod has a threaded section and a snap-fit ​​section. The threaded section is threadedly connected to the threaded through hole, and the snap-fit ​​section is snapped with the bottom surface of the through hole. The fixing head has a first adapter hole and a second adapter hole on the two outer sides of the through groove sidewall, and the clamp has a first adapter hole and a second adapter hole on the back of the first clamping part, and a first adapter hole on the two sides perpendicular to the first clamping part.

2. The clamping device with adjustable clamping force according to claim 1, characterized in that: The two connecting parts are provided with clearance grooves, and the two clearance grooves are respectively connected to the two snap-fit ​​holes, and the two clearance grooves are in a clearance relationship with the spiral rod.

3. The clamping device with adjustable clamping force according to claim 1, characterized in that: A first countersunk hole is provided at the bottom of the through groove of the fixed head, extending downward from the through hole opening. One end of the elastic element abuts against the bottom of the first countersunk hole, and the other end abuts against the bottom surface of the two connecting parts. The elastic element is sleeved on the helical rod and is not exposed to the helical rod.

4. The clamping device with adjustable clamping force according to claim 1, characterized in that: Both the first clamping part and the second clamping part are provided with anti-slip pad grooves, and anti-slip pads are installed in the anti-slip pad grooves.

5. The clamping device with adjustable clamping force according to claim 4, characterized in that: The surface of the anti-slip mat has granular protrusions.

6. The clamping device with adjustable clamping force according to claim 1, characterized in that: The screw rod has a knob installed at one end where the snap-fit ​​section is located. The screw rod has a mounting section at the end of the shaft section. The surface of the mounting section has several straight surfaces. The knob has an anti-rotation hole that is adapted to the periphery of the mounting section. The end face of the mounting section is provided with a mounting section hole, and a locking rod is detachably connected to the mounting section hole. The radial dimension of the head of the locking rod is larger than that of the anti-rotation hole, and the head of the locking rod limits the knob. The locking rod head is provided with an internal hexagonal hole.

7. The clamping device with adjustable clamping force according to claim 6, characterized in that: The knob has a second countersunk hole at the opening of the anti-rotation hole, the bottom surface of the second countersunk hole is aligned with the end face of the mounting section hole, and the head of the locking rod is accommodated in the second countersunk hole.

8. The clamping device with adjustable clamping force according to claim 1, characterized in that: A washer is provided between the bottom surface of the head and the snap-fit ​​section. The washer is sleeved on the spiral rod and abuts against the bottom surface of the head and the snap-fit ​​section respectively.

9. The clamping device with adjustable clamping force according to claim 1, characterized in that: The end face of the threaded section is provided with a threaded section hole, and the threaded section hole can be detachably connected to a limit rod; The head of the limit rod has an internal hexagonal hole.

10. The clamping device with adjustable clamping force according to claim 1, characterized in that: The threads of the threaded section and the threaded through hole are right-hand threads.

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