Clamping device

Abstract

The utility model provides a clamping device which comprises a stacking table, a pressure adjusting assembly and a limiting supporting mechanism, the stacking table comprises a bottom plate and a plurality of positioning rods, the positioning rods are detachably and fixedly arranged on the bottom plate, and a positioning area matched with a measured object is defined on the upper side of the bottom plate; the pressure adjusting assembly is movably arranged above the stacking table and comprises a cylinder body and a piston which are movably connected in a sealed mode. The limiting and supporting mechanism is arranged to abut against the cylinder body from different heights and limit the maximum distance between the cylinder body and the bottom plate, so that the piston can apply pressure to a tested object placed on the stacking table. Dynamic adjustment of the pressing force applied to the tested object is realized by adjusting the pressure adjusting assembly, and the device is suitable for tested objects with different numbers of single batteries.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell testing, in particular to a clamping device. Background Art

[0002] A fuel cell (PEMFC) is a power generation device that converts chemical energy in fuel into electrical energy through an electrochemical reaction. A fuel cell stack can be assembled by alternating multiple bipolar plates and membrane electrode assemblies, and clamped and fixed at both ends with end plates and fasteners. A fuel cell stack includes multiple single cell structures, each of which includes a cathode plate, an anode plate, and a membrane electrode assembly sandwiched between the cathode and anode plates. Two current collecting plates are also provided at both ends of the fuel cell stack, respectively located between the corresponding end plates and the adjacent single cells, for conducting the current generated by the fuel cell stack.

[0003] During the product assembly process of the fuel cell stack, a large press is required to assist in the assembly. After the components of the fuel cell stack are stacked in the correct order, the press applies a set pressing force to compress it to a certain height, and then uses rigid fasteners such as screws and metal strapping (ropes) to lock it to keep its current height, so that the internal compression force of the fuel cell stack reaches the set pressing force.

[0004] However, in the development process of fuel cell stacks, it is usually necessary to use single cells or short stacks (fuel cell stacks with a small number of single cells) as the objects to be tested for performance testing. The number of single cells in the object to be tested is far less than the number of single cells in the actual product. If the assembly is still carried out according to the above-mentioned product assembly process, the resources of the large press will inevitably be occupied, and it is necessary to manufacture additional adaptive fasteners according to the actual specifications of the object to be tested. The assembly process is also relatively cumbersome, which greatly wastes manpower and material resources. In addition, the development process may involve exploring the relationship between clamping force and performance. If the assembly is carried out according to the above-mentioned product assembly process, the object to be tested needs to be repeatedly disassembled and assembled, and dynamic adjustment of the clamping force cannot be achieved. Utility Model Content

[0005] Based on the above problems existing in the prior art, the utility model aims to solve the technical problem that the prior art lacks a clamping device specifically used for single cell or short stack testing.

[0006] The utility model provides a clamping device, which comprises:

[0007] The stacking platform comprises a bottom plate and a plurality of positioning rods, wherein the plurality of positioning rods are detachably fixed on the bottom plate and enclose a positioning area adapted to the object to be measured on the upper side of the bottom plate;

[0008] A pressure regulating assembly, movably arranged above the stacking platform, the pressure regulating assembly comprising a cylinder and a piston that are movable and sealed;

[0009] The position-limiting support mechanism is configured to abut against the cylinder body from different heights, limiting the maximum distance between the cylinder body and the bottom plate, so that the piston can apply pressure to the object to be measured placed on the stacking table.

[0010] According to an embodiment of the utility model, the clamping device also includes an upper insulating plate and a lower insulating plate, the upper insulating plate is detachably fixed on the bottom end of the piston, and the lower insulating plate is arranged on the upper side of the bottom plate, the upper insulating plate includes an insulating plate body and a special-shaped support member arranged on the outside of the insulating plate body and detachably connected to the insulating plate body, the special-shaped support member is used to provide support for the ear of the upper current collecting plate above the object to be measured, wherein the special-shaped support member is formed with a U-shaped groove for the ear of the upper current collecting plate to pass through.

[0011] According to one embodiment of the utility model, the clamping device also includes an upper insulating plate and a lower insulating plate, the upper insulating plate is detachably fixed on the bottom end of the piston, the lower insulating plate is arranged on the upper side of the bottom plate, and the edge of the lower insulating plate partially protrudes outward to form a supporting portion to provide support for the ear of the lower current collecting plate under the object to be measured.

[0012] According to an embodiment of the utility model, the lower insulating plate includes a main body and end portions movably arranged on the outer sides of both ends of the main body, the bottom ends of the end portions penetrate into the bottom plate of the stacking table, and the end portions are provided with through holes adapted to the object to be measured.

[0013] According to an embodiment of the utility model, the clamping device further includes a plurality of vertical supporting legs, and the vertical supporting legs are installed at the bottom of the base plate.

[0014] According to an embodiment of the utility model, the clamping device also includes a plurality of transverse supporting legs, wherein some of the transverse supporting legs are detachably fixedly mounted on the side walls of the base plate, and the remaining transverse supporting legs are detachably fixedly mounted on the side walls of the cylinder body.

[0015] According to an embodiment of the utility model, the pressure regulating assembly further includes a plurality of guide rods, the bottom ends of the guide rods are fixedly connected to the piston, and the guide rods movably pass through the cylinder body and are sealedly connected to the cylinder body.

[0016] According to an embodiment of the utility model, one end of the guide rod away from the piston extends radially to form an anti-slip portion.

[0017] According to an embodiment of the utility model, the clamping device further comprises at least two handles arranged on the top of the cylinder body, the handles have horizontally extending supporting edges, and the supporting edges are always higher than the anti-slip portion.

[0018] According to an embodiment of the utility model, a Y-shaped sealing ring and an O-shaped sealing ring are arranged between the cylinder body and the piston, the O-shaped sealing ring is overlapped in the groove of the Y-shaped sealing ring, and the O-shaped sealing ring is at least partially accommodated in the groove of the Y-shaped sealing ring.

[0019] The main beneficial effects of the utility model are:

[0020] In a clamping device provided by the utility model, the limit support mechanism can press against the cylinder body from different heights to limit the maximum distance between the cylinder body and the base plate, so that the piston can apply pressure to the object to be measured placed on the stacking table, thereby realizing dynamic adjustment of the clamping force on the object to be measured by adjusting the pressure adjustment component, and is suitable for objects to be measured with different numbers of single batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a structural schematic diagram of a clamping device provided by an embodiment of the utility model;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of a clamping device provided by an embodiment of the utility model;

[0024] Figure 3 yes Figure 2 A magnified schematic diagram of the middle part A;

[0025] Figure 4 This is a schematic diagram of the working state of a clamping device provided by the utility model;

[0026] Description of the drawings: 100-measured object; 1-stacking table; 11-bottom plate; 12-positioning rod; 13-fluid connector; 14-sensor; 15-vertical support leg; 16-lateral support leg; 2-pressure regulating assembly; 21-cylinder body; 22-piston; 220-first sealing groove; 221-Y-type sealing ring; 222-O-type sealing ring; 23-guide rod; 230-anti-slip portion; 24-sealing ring; 25-handle; 251-support edge; 3-limiting support mechanism; 31-fixing rod; 310-positioning hole; 32-limiting rod; 4-upper insulating plate; 41-insulating plate body; 42-special-shaped support member; 5-lower insulating plate; 50-support portion; 51-main body; 52-end portion; 520-through hole. DETAILED DESCRIPTION

[0027] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments that can be used to implement the present invention.

[0028] The utility model provides a clamping device, the structure of which is as follows Figure 1 As shown, it includes a stacking platform 1, a pressure regulating component 2 and a limit support mechanism 3, wherein the stacking platform 1 includes a base plate 11 and a plurality of positioning rods 12, wherein the plurality of positioning rods 12 are detachably fixedly arranged on the base plate 11, and enclose a positioning area on the upper side of the base plate 11, the shape and size of which match the shape and size of the object 100 to be tested, and the setting of the positioning area can improve the positioning accuracy of the object 100 to be tested, thereby improving the test accuracy of the object 100 to be tested; the object 100 to be tested can be a single battery, or a single battery group (composed of a plurality of single batteries) used to form a short stack; the pressure regulating component 2 is movably arranged above the stacking platform 1, and the pressure regulating component 2 includes a cylinder 21 and a piston 22 that are movable and sealed; specifically, The bottom end of the positioning rod 12 can be screwed to the bottom plate 11, and the positioning rod 12 should not block the piston 22, wherein when the measured object 100 is compressed, there is still a gap between the piston 22 and the top of the positioning rod 12; optionally, the pressure regulating assembly 2 can be a cylinder, a hydraulic cylinder or an electric push rod, or a driving mechanism with a movable end (the movable end is the piston 22) that can move linearly, and the principle of the movable end moving linearly can be pneumatic or mechanical transmission, etc.; the limit support mechanism 3 is configured to be able to resist the cylinder body 21 from different heights, limit the maximum distance between the cylinder body 21 and the bottom plate 11, so that the piston 22 can apply pressure to the measured object 100 placed on the stacking table 1. When the pressure regulating assembly 2 is implemented as a cylinder, the pressure on the measured object 100 can be adjusted by adjusting the air pressure in the air cavity between the cylinder body 21 and the piston 22.

[0029] like Figure 2 The figure shows a cross-sectional structure diagram of a clamping device provided by the utility model. Figure 3 Shown Figure 2 In the enlarged schematic diagram of part A in the middle, as a specific embodiment, in order to achieve the sealing between the cylinder body 21 and the piston 22, a Y-shaped sealing ring 221 and an O-shaped sealing ring 222 are arranged between the cylinder body 21 and the piston 22, the O-shaped sealing ring 222 is stacked in the groove of the Y-shaped sealing ring 221, and the O-shaped sealing ring 222 is at least partially accommodated in the groove of the Y-shaped sealing ring 221, and the combined sealing structure of the Y-shaped sealing ring 221 and the O-shaped sealing ring 222 can enhance the sealing effect between the cylinder body 21 and the piston 22, and improve the reliability of the pressure regulating assembly 2. Optionally, the outer wall of the piston 22 is provided with a first sealing groove 220, and the Y-shaped sealing ring 221 and the O-shaped sealing ring 222 are both arranged in the first sealing groove 220; on the contrary, the first sealing groove 220 is arranged on the inner wall of the cylinder body 21. It should be noted that the combined sealing structure of the Y-ring 221 and the O-ring 222 selected between the cylinder body 21 and the piston 22 is a preferred embodiment of the utility model. In other embodiments, other sealing structures may also be selected between the cylinder body 21 and the piston 22, such as only setting a single sealing ring.

[0030] Compared with the prior art, in a clamping device provided by the utility model, the limit support mechanism 3 can abut against the cylinder body 21 from different heights, so as to adaptively limit the maximum distance between the cylinder body 21 and the base plate 11 according to the number of single cells of the measured object 100.

[0031] Please continue to refer to Figure 1 or Figure 2 In order to further guide and constrain the relative movement between the cylinder body 21 and the piston 22 to ensure the accuracy of the relative movement, according to an embodiment of the utility model, the pressure regulating assembly 2 also includes a plurality of guide rods 23, the bottom ends of the guide rods 23 are fixedly connected to the piston 22, and the guide rods 23 movably pass through the cylinder body 21 and are sealed and connected to the cylinder body 21. During actual testing, the staff can intuitively know the extent of the downward movement of the piston 22 relative to the cylinder body 21 based on the length of the guide rods 23 exposed to the outside of the cylinder body 21, so that the staff can judge whether the piston 22 is about to reach the limit stroke. Specifically, the bottom end of the guide rod 23 is threaded, a threaded blind hole is provided on the piston 22, and the bottom end of the guide rod 23 is threadedly connected to the piston 22.

[0032] In order to realize the movable sealing connection between the guide rod 23 and the cylinder body 21, a sealing ring 24 is also provided between the outer wall of the guide rod 23 and the cylinder body 21. Figure 3 shown.

[0033] Please continue to refer to Figure 1 Furthermore, in order to forcibly prevent the piston 22 from having an excessive stroke, which may cause the guide rod 23 to be disconnected from the cylinder body 21, or even the cylinder body 21 and the piston 22 to be separated from each other, the guide rod 23 is radially extended at one end away from the piston 22 to form an anti-detachment portion 230. The anti-detachment portion 230 can limit the stroke of the piston 22 to prevent the guide rod 23 from being disconnected from the cylinder body 21 when the piston 22 descends a large stroke, and at the same time prevent the cylinder body 21 and the piston 22 from being separated from each other.

[0034] In order to facilitate the movement of the pressure regulating assembly 2 or the clamping device in this solution, according to an embodiment of the utility model, the pressure regulating assembly 2 also includes at least two handles 25 installed on or integrally formed on the top of the cylinder body 21. Preferably, the handle 25 has a horizontally extending support edge 251, and the support edge 251 is always higher than the anti-slip portion 230, so that when the pressure regulating assembly 2 is placed upside down, the handle 25 can also serve as a support foot, so that the pressure regulating assembly 2 can be stably placed upside down on a placement surface in a certain placement area, and the support edge 251 of the handle 25 directly contacts the placement surface, so as to avoid the pressure transmission surface at the bottom end of the piston 22 from frequent contact or friction with the placement surface to cause wear, and prevent the flatness of the pressure transmission surface of the piston 22 from being reduced, resulting in uneven pressure transmission.

[0035] It is worth mentioning that the supporting edge 251 is always higher than the anti-slip portion 230. The term "always higher" means that when the pressure regulating assembly 2 is installed on the clamping device and the clamping device is in Figure 1 and Figure 4 In the placement state shown, even if the anti-slip portion 230 of the guide rod 23 moves up to the maximum allowed height, the supporting edge 251 is still higher than the anti-slip portion 230 .

[0036] Since the pressure regulating assembly 2 is usually made of metal, and in order to make the bottom plate 11 of the stacking platform 1 have higher strength, the bottom plate 11 of the stacking platform 1 is generally made of metal. In order to achieve insulation between the piston 22 and the upper collecting plate and between the bottom plate 11 and the lower collecting plate during testing, according to an embodiment of the utility model, the clamping device also includes an upper insulating plate 4 and a lower insulating plate 5, the upper insulating plate 4 is detachably fixed on the bottom end of the piston 22, and the lower insulating plate 5 is detachably fixed on the upper side of the bottom plate 11 of the stacking platform 1.

[0037] Specifically, the upper insulating plate 4 includes an insulating plate body 41 and a special-shaped support member 42 arranged on the outside of the insulating plate body 41 and detachably connected to the insulating plate body 41, and the special-shaped support member 42 is formed with a U-shaped groove for the ear of the upper current collecting plate to pass through, and the special-shaped support member 42 is used to provide support for the ear of the upper current collecting plate.

[0038] The edge of the lower insulating plate 5 partially protrudes outward to form a supporting portion 50 for providing support for the ear portion of the lower current collecting plate.

[0039] It is not difficult to understand that, since during the test, thick wires need to be used to connect the ears of the upper current collecting plate and the ears of the lower current collecting plate to draw out the current generated by the object under test, the U-shaped groove of the special-shaped support member 42 and the support portion 50 can provide support for the ears of the upper current collecting plate and the ears of the lower current collecting plate respectively, so as to avoid excessive deformation of the ears of the upper current collecting plate and the ears of the lower current collecting plate due to the gravity of the thick wires.

[0040] It is particularly worth mentioning that the pressure regulating assembly 2 is placed upside down using the handle 25, which is also convenient for pre-fixing the upper insulating plate 4 on the bottom end of the piston 22, and also convenient for pre-fixing the upper current collecting plate to the upper insulating plate 4, such as using screws or other connecting parts to pre-lock the upper current collecting plate to the upper insulating plate 4, so that during the assembly process of the clamping device and the object to be measured, the pressure regulating assembly 2, the upper insulating plate 4, and the upper current collecting plate can be assembled as a whole to avoid misalignment of components or parts during assembly.

[0041] In order to match the measured object with different fluid port arrangements, the lower insulating plate 5 further includes a main body 51 and end portions 52 movably arranged outside the two ends of the main body 51, and through holes 520 for fluid to flow through are opened at positions of the end portions 52 corresponding to the fluid inlet and / or fluid outlet of the measured object 100. Preferably, the bottom end of the end portion 52 penetrates the bottom plate 11 of the stacking platform 1.

[0042] It can be understood that during actual testing, different end portions 52 can be replaced according to the arrangement position and morphology of the fluid port of the electrode plate of the object under test 100, so that the through hole 520 on the replaced end portion 52 corresponds to and matches the position of the fluid port of the electrode plate of the object under test 100, thereby making the clamping device more versatile.

[0043] According to an embodiment of the utility model, the stacking station 1 also includes a plurality of fluid connectors 13, a plurality of sensors 14 and a plurality of vertical support legs 15. The fluid connector 13 is detachably fixedly mounted below the base plate 11, is sealed and connected to the bottom end of the end portion 52, and is communicated with the through hole 520 to realize the introduction and export of the fluid; the sensor 14 is detachably fixedly mounted on the fluid connector 13. Specifically, the sensor 14 may be a temperature sensor and / or a pressure sensor, or may be a temperature-pressure integrated sensor for detecting the fluid temperature and / or pressure near the fluid port of the object to be measured; in order to facilitate the installation of the fluid connector 13 and the sensor 14 below the base plate 11, the vertical support legs 15 are also installed at the bottom of the base plate 11. By setting the vertical support legs 15, the height of the base plate 11 can be raised, so that there is a larger space below the base plate 11 to install the fluid connector 13 and the sensor 14.

[0044] Furthermore, in order to perform lateral testing, the clamping device also includes a plurality of lateral support legs 16 , wherein some of the lateral support legs 16 are detachably fixedly mounted on the side walls of the base plate 11 , and the remaining lateral support legs 16 are detachably fixedly mounted on the side walls of the cylinder body 21 .

[0045] According to an embodiment of the utility model, the limiting support mechanism 3 includes a plurality of fixing rods 31 and a plurality of limiting rods 32, the bottom ends of the fixing rods 31 are detachably connected to the bottom plate 11, the fixing rods 31 movably pass through the cylinder body 21, and the fixing rods 31 are respectively provided with positioning holes 310 at different heights, the diameter of the positioning holes 310 is slightly larger than the outer diameter of the limiting rods 32; the fixing rods 31 are divided into at least two groups, and the limiting rods 32 movably pass through the positioning holes 310 at the same height of the fixing rods 31 of the same group.

[0046] like Figure 4 The figure is a schematic diagram of the working state of a clamping device provided by the utility model. In order to facilitate the understanding of the utility model, the following is combined with Figure 4 The working principle of this solution is described in detail:

[0047] In a preferred assembly method of the clamping device and the object to be measured 100, initially, the pressure regulating assembly 2 is not installed on the clamping device, but is placed upside down in a certain placement area (the supporting edge 251 of the handle 25 contacts the placement surface of the placement area). First, install the lower insulating plate 5 matched with the object to be measured 100 on the upper side of the bottom plate 11, then stack the lower collecting plate and the object to be measured in sequence and place them on top of the lower insulating plate 5, and make the ear of the lower collecting plate supported by the support portion 50 of the lower insulating plate 5, then install the insulating plate body 41 of the upper insulating plate 4 on the inverted pressure regulating assembly 2, and then install the upper collecting plate on the upper insulating plate 4. At this time, the pressure regulating assembly 2 can be flipped by using the handle 25, and then moved and placed above the object to be measured, and the fixing rod 31 is allowed to move through the cylinder body 21, and finally, the limiting rod 32 is inserted into the positioning hole 310 on the fixing rod 31 at the height position corresponding to the cylinder body 21, and the pressure regulation can be started.

[0048] The pressure regulating assembly 2 is started to move the cylinder body 21 and the piston 22 away from each other. Since the cylinder body 21 is stopped by the limit rod 32, the maximum distance between the cylinder body 21 and the bottom plate 11 is limited. The maximum distance refers to the maximum height of the pressure regulating assembly 2 in the vertical direction, that is, the cylinder body 21 cannot continue to move up after moving up to the position, so the piston 22 moves down to compress the object to be measured, and applies pressure to the object to be measured 100 through the upper insulating plate 4 and the upper collecting plate in turn until a certain set clamping force is reached.

[0049] When the object under test 100 is under the test condition of the set clamping force, the object under test 100 is connected to the load in a circuit so that the current generated by the object under test 100 after operation can be conducted to the load and consumed by the load to form an electrical circuit, for example, the ear of the upper current collector and the ear of the lower current collector are connected. Before the ear of the upper current collector is connected, the special-shaped support member 42 is installed on the insulating plate body 41 of the upper insulating plate 4. Specifically, during installation, the U-shaped groove on the special-shaped support member 42 needs to be supported on the bottom of the ear of the upper current collector to provide support for the ear of the upper current collector.

[0050] After the circuit connection is completed, fuel and oxidant can be supplied to the object under test through the fluid connector 13. If necessary, a heat exchange medium (such as deionized water or other coolant for fuel cells) should also be supplied to start the electrochemical reaction of the object under test, and then start testing the performance of the object under test.

[0051] To sum up, in a clamping device provided by the utility model, the limit support mechanism 3 can press against the cylinder body 21 from different heights, limit the maximum distance between the cylinder body 21 and the base plate 11, so that the piston 22 can apply pressure to the object to be measured placed on the stacking table 1, so that the object to be measured is in a test condition with a set clamping force; in addition, the special-shaped support member 42 on the upper insulating plate 4 and the support portion 50 on the lower insulating plate 5 can respectively provide support for the ears of the upper current collecting plate and the ears of the lower current collecting plate, so as to avoid excessive bending of the ears of the upper current collecting plate and the ears of the lower current collecting plate due to the gravity of the wires during wiring, thereby providing protection for the ears of the upper current collecting plate and the ears of the lower current collecting plate.

[0052] It should be noted that although the present invention is disclosed as above with specific embodiments, the above embodiments are not intended to limit the present invention. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A clamping device, characterized in that: include: A stacking table (1) comprises a bottom plate (11) and a plurality of positioning rods (12), wherein the plurality of positioning rods (12) are detachably fixedly arranged on the bottom plate (11) and surround a positioning area on the upper side of the bottom plate (11) that is adapted to the object to be measured (100); A pressure regulating assembly (2) is movably arranged above the stacking platform (1), and the pressure regulating assembly (2) comprises a cylinder (21) and a piston (22) that are movable and sealed; The position-limiting support mechanism (3) is configured to be able to abut against the cylinder body (21) from different heights, limiting the maximum distance between the cylinder body (21) and the base plate (11), so that the piston (22) can apply pressure to the object to be measured (100) placed on the stacking table (1).

2. A clamping device according to claim 1, characterized in that: It also includes an upper insulating plate (4) and a lower insulating plate (5), wherein the upper insulating plate (4) is detachably fixedly arranged at the bottom end of the piston (22), and the lower insulating plate (5) is arranged on the upper side of the bottom plate (11), and the upper insulating plate (4) includes an insulating plate body (41) and a special-shaped support member (42) arranged on the outside of the insulating plate body (41) and detachably connected to the insulating plate body (41), wherein the special-shaped support member (42) is used to provide support for the ear of the upper current collecting plate above the object to be measured (100), wherein the special-shaped support member (42) is formed with a U-shaped groove for the ear of the upper current collecting plate to pass through.

3. A clamping device according to claim 1, characterized in that: It also includes an upper insulating plate (4) and a lower insulating plate (5), wherein the upper insulating plate (4) is detachably fixedly arranged on the bottom end of the piston (22), and the lower insulating plate (5) is arranged on the upper side of the bottom plate (11), and the edge of the lower insulating plate (5) partially protrudes outward to form a supporting portion (50) for providing support for the ear portion of the lower current collecting plate below the object to be measured (100).

4. A clamping device according to claim 2 or 3, characterized in that: The lower insulating plate (5) comprises a main body (51) and end portions (52) movably arranged outside both ends of the main body (51), the bottom ends of the end portions (52) penetrate into the bottom plate (11), and the end portions (52) are provided with through holes (520) adapted to the object to be measured (100).

5. A clamping device according to any one of claims 1 to 3, characterized in that: The stacking platform (1) further comprises a plurality of vertical supporting legs (15), wherein the vertical supporting legs (15) are installed at the bottom of the base plate (11).

6. A clamping device according to any one of claims 1 to 3, characterized in that: It also includes a plurality of transverse supporting legs (16), wherein some of the transverse supporting legs (16) are detachably fixedly mounted on the side wall of the base plate (11), and the remaining transverse supporting legs (16) are detachably fixedly mounted on the side wall of the cylinder body (21).

7. A clamping device according to any one of claims 1 to 3, characterized in that: The pressure regulating assembly (2) further comprises a plurality of guide rods (23), the bottom ends of the guide rods (23) being fixedly connected to the piston (22), and the guide rods (23) being movable through the cylinder body (21) and being sealedly connected to the cylinder body (21).

8. A clamping device according to claim 7, characterized in that: One end of the guide rod (23) away from the piston (22) extends radially to form an anti-slip portion (230).

9. A clamping device according to claim 8, characterized in that: It also includes at least two handles (25) arranged on the top of the cylinder body (21), wherein the handles (25) have horizontally extending support edges (251), and the support edges (251) are always higher than the anti-slip portion (230).

10. A clamping device according to any one of claims 1 to 3, characterized in that: A Y-shaped sealing ring (221) and an O-shaped sealing ring (222) are provided between the cylinder body (21) and the piston (22); the O-shaped sealing ring (222) is superimposed on the groove of the Y-shaped sealing ring (221), and the O-shaped sealing ring (222) is at least partially accommodated in the groove of the Y-shaped sealing ring (221).

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