A radiator for an energy storage system

Abstract

The present invention relates to the technical field of radiators, and discloses a radiator for an energy storage system, which includes a liquid cooling plate, a fixing frame connected below the liquid cooling plate, and an energy storage battery connected above the liquid cooling plate. A support plate is slidably connected to the bottom surface of the liquid cooling plate. Both sides of the bottom surface of the support plate are in contact with the surface of the fixing frame. Both sides of the support plate are fixedly connected with support rods. A plurality of connection holes are equidistantly arranged on the surface of each support rod. A pressure spring is fixedly connected in the connection hole. The top of the pressure spring is fixedly connected with two moving plates. The moving plates correspond to the positions of the support rods. The surface of the moving plate is in contact with the surface of the energy storage battery. In the whole maintenance process of the present invention, there is no need to disassemble the energy storage battery, which simplifies the maintenance process, reduces the operation difficulty and risk, improves the maintenance efficiency, avoids the risk that the frequent disassembly and assembly of the battery will increase the risk of battery damage or performance decline, and improves the overall safety and stability of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of radiators, and more particularly to a radiator for an energy storage system. Background Art

[0002] In the context of the current energy structure transformation and the development of renewable energy, energy storage systems, as an important means to balance the power grid supply and demand and improve the flexibility and reliability of the power system, are being applied more and more widely. Energy storage systems, especially electrochemical energy storage systems, generate a large amount of heat during the charge and discharge process. If this heat cannot be effectively dissipated, it may cause the battery temperature to be too high, affecting the performance, lifespan, and even safety of the battery. Therefore, an efficient and reliable heat dissipation system is crucial for ensuring the stable operation of the energy storage system.

[0003] Existing energy storage systems usually use a liquid cooling system for heat dissipation. The liquid cooling system generally includes a liquid cooling plate, an inlet pipe, an outlet pipe, and a heat exchanger. When in use, the liquid cooling plate is installed on the bottom surface of the energy storage battery, and then coolant is introduced into the liquid cooling pipe through the inlet pipe. The liquid cooling plate absorbs the heat of the energy storage battery, and the coolant then brings the heat into the heat exchanger through the outlet pipe, and the heat exchanger cools the coolant to achieve a cooling cycle.

[0004] For example, in the prior art, the patent with the patent authorization announcement number CN218731305U discloses a liquid cooling safety temperature control system for a chemical energy storage device and system, including an inlet pipe, a return pipe, a temperature control pipeline system, and a temperature equalization pipeline system; a temperature control unit is provided inside the chemical energy storage device, and a temperature control flow channel for the circulation of the temperature control medium is provided inside the temperature control unit; the temperature control pipeline system includes a booster pump, a first inlet pipe is provided between the inlet of the booster pump and the inlet pipe, a temperature control inlet pipe is provided at the outlet of the booster pump, and a temperature control return pipe is provided on the return pipe; the temperature equalization pipeline system includes a circulation pump and a circulation water tank, a temperature equalization inlet pipe is provided at the outlet of the circulation pump, the outlet of the circulation water tank is connected to the inlet of the circulation pump through a second inlet pipe, and a temperature equalization return pipe is provided at the inlet of the circulation water tank. The above technical solution also discloses a liquid cooling safety temperature control system for a chemical energy storage system.

[0005] Although the liquid cooling safety temperature control system of the chemical energy storage device and system in the above patent can achieve temperature control and uniform temperature management to improve operation safety, the existing heat sink of the energy storage system has certain defects when in use; when the existing heat sink of the energy storage system is in use, the liquid cooling plate will be installed on the fixing frame. Since the liquid cooling plate is pressed under the energy storage battery, when maintenance of the liquid cooling plate is required, the staff needs to first disassemble the energy storage battery and then can remove the liquid cooling plate for maintenance. This process is not only cumbersome and time-consuming, with low maintenance efficiency, but also increases the difficulty and risk of maintenance work. Frequent disassembly and assembly of the battery will increase the risk of battery damage or performance decline. Especially during multiple disassembly and assembly operations, the battery connectors are vulnerable to damage, affecting the overall safety and stability of the battery pack. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a heat sink for an energy storage system to solve the problems raised in the background art, enabling maintenance of the liquid cooling plate without disassembling the energy storage battery.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A heat sink for an energy storage system includes a liquid cooling plate, a fixing frame connected to the lower side of the liquid cooling plate, and an energy storage battery connected to the upper side of the liquid cooling plate. A support plate is slidably connected to the bottom surface of the liquid cooling plate. Both sides of the bottom surface of the support plate are in contact with the surface of the fixing frame. Both sides of the support plate are fixedly connected with support rods. A plurality of connection holes are equally spaced on the surface of each support rod. A pressure spring is fixedly connected in the connection hole. The top end of the pressure spring is fixedly connected with two moving plates. The moving plates correspond to the positions of the support rods. The surface of the moving plate is in contact with the surface of the energy storage battery. One end of each support rod is connected with a limiting component, and one end of the moving plate is connected with a lifting component.

[0008] Further, the limiting component includes a rotating shaft, a rotating block, a connecting block, and a limiting block. A connecting groove is opened at one end of the support rod. The rotating shaft is fixedly connected with the connecting groove. The rotating block is rotatably connected with the rotating shaft. The connecting block is fixedly connected with the rotating block. One side of the top of the connecting block is fixedly connected with the limiting block. The bottom surface of the limiting block is in contact with the surface of the moving plate.

[0009] Further, the lifting component includes a connecting plate and a lifting plate. The connecting plate is fixedly connected to the side of the liquid cooling plate away from the limiting block. Both ends of the lifting plate are fixedly connected to the sides of the two moving plates away from the limiting block. One side of the connecting plate is in contact with the lifting plate. The two sides of the connecting plate are respectively set as surface a and surface c. One side of the lifting plate is set as surface b. Surfaces a, b, and c are all inclined surfaces and are all parallel surfaces. Surface a is in contact with surface b, and surface c is in contact with one side of the energy storage battery. A limiting plate is fixedly connected to the side of the liquid cooling plate away from the connecting plate. One side of the limiting plate is in contact with the side wall of the energy storage battery.

[0010] Furthermore, a phase change sheet is fixedly connected to the surface of the liquid cooling plate, and the bottom surface of the energy storage battery is attached to the surface of the phase change sheet.

[0011] Furthermore, a plurality of heat conduction grooves are formed on the surface of the liquid cooling plate, and the bottom surface of the phase change sheet is attached to the heat conduction grooves.

[0012] Furthermore, a handle is fixedly connected to one side of the liquid cooling plate close to the limiting block, and an anti-slip sleeve is sleeved on the outer wall of the handle.

[0013] Furthermore, a plurality of moving rods are fixedly connected to the bottom surface of the moving plate, and the moving rods correspond to the connection holes in position.

[0014] Furthermore, a positioning block is fixedly connected to one side of the bottom of the connecting block, and a positioning groove corresponding to the positioning block in position is formed at one end of the support rod.

[0015] Furthermore, a moving block is fixedly connected to the side of the connecting block away from the limiting block, and anti-slip patterns are provided on both sides of the moving block.

[0016] Furthermore, two symmetrically arranged sliding rods are fixedly connected to the bottom surface of the liquid cooling plate, and sliding grooves corresponding to the sliding rods in position are formed on the surface of the support plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] For this energy storage system radiator, compared with the existing liquid cooling plate maintenance method, the entire maintenance process of the present invention does not require the disassembly of the energy storage battery, simplifies the maintenance process, reduces the operation difficulty and risk, improves the maintenance efficiency, avoids the risk of increased battery damage or performance decline caused by frequent disassembly and assembly of the battery, improves the overall safety and stability of the battery pack. At the same time, due to the simple and quick maintenance, the liquid cooling plate can be inspected and cleaned more frequently and timely to ensure that the heat dissipation channel is unobstructed, effectively avoiding the problem of battery overheating caused by poor heat dissipation, and improving the thermal management efficiency of the entire energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the whole of the present invention;

[0020] Figure 2 is a three-dimensional structural schematic diagram of the energy storage battery, fixed frame and liquid cooling plate of the present invention;

[0021] Figure 3 is a three-dimensional structural schematic diagram of another form of the present invention;

[0022] Figure 4 is a three-dimensional sectional structural schematic diagram of the liquid cooling plate, handle, connecting plate and phase change sheet of the present invention;

[0023] Figure 5Schematic diagram of the three-dimensional sectional structure of the liquid cooling plate, connection plate and lifting plate of the present invention;

[0024] Figure 6 Schematic diagram of the three-dimensional structure of the support plate and support rod of the present invention;

[0025] Figure 7 Schematic diagram of the three-dimensional structure of the connection block, limit block, positioning block and moving block of the present invention;

[0026] Figure 8 Schematic diagram of the three-dimensional structure of the moving plate, lifting plate and pressure spring of the present invention;

[0027] Figure 9 Schematic diagram of the three-dimensional structure of the moving plate, pressure spring and moving rod of the present invention;

[0028] Figure 10 Schematic diagram of the three-dimensional structure of the handle and anti-slip sleeve of the present invention;

[0029] Figure 11 is Figure 2 Schematic diagram of the three-dimensional enlarged structure at position A above;

[0030] Figure 12 is Figure 6 Schematic diagram of the three-dimensional enlarged structure at position B above.

[0031] In the figure: 1. Liquid cooling plate; 2. Fixed frame; 3. Energy storage battery; 4. Support plate; 5. Support rod; 6. Connection hole; 7. Pressure spring; 8. Moving plate; 9. Connection groove; 10. Rotating shaft; 11. Rotating block; 12. Connection block; 13. Limit block; 14. Positioning block; 15. Moving block; 16. Anti-slip pattern; 17. Sliding groove; 18. Sliding rod; 19. Handle; 20. Anti-slip sleeve; 21. Phase change sheet; 22. Heat conduction groove; 23. Connection plate; 24. Lifting plate; 25. Limit plate; 26. Moving rod; 27. Positioning groove. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] Please refer to Figures 1 - 12, an energy storage system radiator, comprising a liquid cooling plate 1, a fixing frame 2 connected below the liquid cooling plate 1, and an energy storage battery 3 connected above the liquid cooling plate 1. A support plate 4 is slidably connected to the bottom surface of the liquid cooling plate 1. Both sides of the bottom surface of the support plate 4 are in contact with the surface of the fixing frame 2. Both sides of the support plate 4 are fixedly connected with support rods 5. A plurality of connection holes 6 are equidistantly formed on the surface of each support rod 5. A pressure spring 7 is fixedly connected in the connection hole 6. The top end of the pressure spring 7 is fixedly connected with two moving plates 8. The moving plates 8 correspond to the positions of the support rods 5. The surface of the moving plate 8 is in contact with the surface of the energy storage battery 3. One end of each support rod 5 is connected with a limiting component, and one end of the moving plate 8 is connected with a lifting component.

[0034] In the energy storage system radiator of the present invention, when maintenance of the liquid cooling plate 1 is required, the staff opens the limiting component, and then under the action of the pressure spring 7, the moving plate 8 will lift the energy storage battery 3 upwards. At this time, the energy storage battery 3 will lose the downward pressure on the liquid cooling plate 1, and the liquid cooling plate 1 can be pulled out for maintenance. After the maintenance is completed, the liquid cooling plate 1 is pushed back to its original position, and the energy storage battery 3 is lowered using the lifting component, so that the bottom surface of the energy storage battery 3 is in close contact with the surface of the liquid cooling plate 1, and then the limiting component is closed, and the operation of the energy storage system can continue; compared with the existing maintenance method, the entire maintenance process of the present invention does not require the disassembly of the energy storage battery 3, simplifies the maintenance process, reduces the operation difficulty and risk, improves the maintenance efficiency, avoids the risk that the frequent disassembly and assembly of the battery will increase the risk of battery damage or performance decline, improves the overall safety and stability of the battery pack. At the same time, due to the simple and fast maintenance, the liquid cooling plate 1 can be inspected and cleaned more frequently and timely, ensuring that the heat dissipation channel is unobstructed, effectively avoiding the problem of battery overheating caused by poor heat dissipation, and improving the thermal management efficiency of the entire energy storage system.

[0035] As a preferred technical solution of the present invention, the limiting component includes a rotating shaft 10, a rotating block 11, a connecting block 12 and a limiting block 13. A connecting groove 9 is formed at one end of the support rod 5. The rotating shaft 10 is fixedly connected with the connecting groove 9. The rotating block 11 is rotatably connected with the rotating shaft 10. The connecting block 12 is fixedly connected with the rotating block 11. One side of the top of the connecting block 12 is fixedly connected with a limiting block 13. The bottom surface of the limiting block 13 is in contact with the surface of the moving plate 8.

[0036] Specifically, when the energy storage system is operating normally, the limit block 13 is close to the movable plate 8, limiting its upward movement. At this time, the pressure spring 7 is compressed, generating an upward force, but due to the action of the limit block 13, the movable plate 8 and the energy storage battery 3 above remain in a fixed position, ensuring good contact between the energy storage battery 3 and the liquid cooling plate 1; when the liquid cooling plate 1 needs to be maintained, the staff rotates the connecting block 12 to drive the limit block 13 on its top to move, so that the limit block 13 is out of contact with the surface of the movable plate 8, and the restriction on the upward movement of the movable plate 8 is released. The elastic force of the pressure spring 7 immediately acts on the movable plate 8, causing it to slide upward, lifting the energy storage battery 3, so that the liquid cooling plate 1 can be released, and the staff can easily pull out the liquid cooling plate 1 for necessary inspection, cleaning or replacement.

[0037] As a preferred technical solution of the present invention, the lifting assembly includes a connecting plate 23 and a lifting plate 24. The connecting plate 23 is fixedly connected to the side of the liquid cooling plate 1 away from the limit block 13. The two ends of the lifting plate 24 are respectively fixedly connected to the sides of the two movable plates 8 away from the limit block 13. One side of the connecting plate 23 is in contact with the lifting plate 24. The two sides of the connecting plate 23 are respectively set as surface a and surface c. One side of the lifting plate 24 is set as surface b. Surface a, surface b and surface c are all inclined surfaces and are all parallel surfaces. Surface a is in contact with surface b, and surface c is in contact with one side of the energy storage battery 3. The side of the liquid cooling plate 1 away from the connecting plate 23 is fixedly connected to the limiting plate 25, and one side of the limiting plate 25 is in contact with the side wall of the energy storage battery 3.

[0038] Specifically, when the limit block 13 is separated from the movable plate 8, the staff member draws out the liquid cooling plate 1. At this time, the surface a and the surface c move forward, and the surface b rises under the action of the pressure spring 7. The surface c will contact the energy storage battery 3, exerting an upward force on the energy storage battery 3, so that the energy storage battery 3 continues to rise until the connecting plate 23 moves to the bottom of the energy storage battery 3. In this process, the surface a and the surface b will always keep in contact, thereby limiting the rising speed of the energy storage battery 3. Through the gradual transition of the inclined surface, the potential energy of the pressure spring 7 can be smoothly released, avoiding the sudden and rapid rise of the energy storage battery 3, and reducing the damage to the energy storage battery 3. The impact of the liquid cooling plate 1 is improved, and the operation safety is improved; when the liquid cooling plate 1 is inserted, the top of the a surface will contact the bottom of the b surface, and under the pressure of the inclined surface, the b surface will drop, thereby driving the movable plate 8 and the energy storage battery 3 on the movable plate 8 to drop, so that the energy storage battery 3 and the liquid cooling plate 1 are kept in close contact, ensuring that there is precise alignment between the energy storage battery 3 and the liquid cooling plate 1, maintaining good heat exchange contact, and optimizing the thermal management efficiency. The connecting plate 23 and the lifting plate 24 not only realize the smooth rise and fall of the energy storage battery 3, but also provide a limit for the other side of the movable plate 8 to prevent the movable plate 8 from tilting due to the pressure of the pressure spring 7.

[0039] As a preferred technical solution of the present invention, a phase change sheet 21 is fixedly connected to the surface of the liquid cooling plate 1, and the bottom surface of the energy storage battery 3 is attached to the surface of the phase change sheet 21.

[0040] Specifically, the phase change sheet 21 is composed of a phase change material, has a high thermal conductivity, can quickly respond to and conduct the heat generated by the energy storage battery 3, ensure that the heat can be transferred to the liquid cooling plate 1 faster, and then be effectively dissipated through the liquid cooling system. The phase change sheet 21 can also fill the possible small gaps or poor contact areas between the energy storage battery 3 and the liquid cooling plate 1 to ensure that the heat can be transferred to the liquid cooling plate 1 more evenly; at the same time, as a soft interface material, the phase change sheet 21 can provide buffering for the liquid cooling plate 1, prevent the liquid cooling plate 1 from being damaged due to long-term compression of the energy storage battery 3, help protect the liquid cooling plate 1, and extend its service life.

[0041] As a preferred technical solution of the present invention, a plurality of heat conduction grooves 22 are formed on the surface of the liquid cooling plate 1, and the bottom surface of the phase change sheet 21 is attached to the heat conduction grooves 22.

[0042] Specifically, the heat conduction grooves 22 can increase the contact area between the liquid cooling plate 1 and the phase change sheet 21, so as to more effectively conduct the heat from the energy storage battery 3. With its high thermal conductivity, the phase change sheet 21 can quickly transfer these heats to the liquid cooling plate 1 and dissipate them through the liquid cooling system.

[0043] As a preferred technical solution of the present invention, a handle 19 is fixedly connected to one side of the liquid cooling plate 1 close to the limit block 13, and an anti-slip sleeve 20 is sleeved on the outer wall of the handle 19.

[0044] Specifically, the design of the handle 19 enables the user to easily hold the liquid cooling plate 1, thus facilitating operations such as moving, installing or disassembling. When it is necessary to adjust the position or maintain the liquid cooling plate 1, the handle 19 can provide a comfortable holding point and reduce the operation difficulty; the design of the anti-slip sleeve 20 increases the friction on the surface of the handle 19, preventing the user from slipping during the operation. Especially when precise control of the position of the liquid cooling plate 1 or delicate operations are required, the anti-slip sleeve 20 can ensure the stability of the user's hand and reduce the risk of equipment damage or personal injury caused by operation errors.

[0045] As a preferred technical solution of the present invention, a plurality of moving rods 26 are fixedly connected to the bottom surface of the moving plate 8, and the moving rods 26 correspond to the connection holes 6 in position.

[0046] Specifically, the position of the moving rod 26 corresponds to that of the connecting hole 6, ensuring that the moving plate 8 can be accurately aligned and inserted into the connecting hole 6 when the moving plate 8 moves or adjusts its position. By utilizing the cooperation between the moving rod 26 and the connecting hole 6, it can be ensured that the moving plate 8 is directly above and below the energy storage battery 3, preventing skew or displacement and ensuring the close contact between the energy storage battery 3 and the phase change sheet 21 on the liquid cooling plate 1.

[0047] As a preferred technical solution of the present invention, a positioning block 14 is fixedly connected to one side of the bottom of the connecting block 12, and a positioning groove 27 corresponding to the position of the positioning block 14 is provided at one end of the support rod 5.

[0048] Specifically, the positioning block 14 is embedded in the positioning groove 27 of the support rod 5 and, together with the limiting block 13, forms a stable three-point support structure, effectively preventing the moving plate 8 from shifting due to vibration or other external force factors during the operation of the system, ensuring the close contact between the energy storage battery 3 and the liquid cooling plate 1, and improving the heat dissipation efficiency and the overall stability of the system.

[0049] As a preferred technical solution of the present invention, a moving block 15 is fixedly connected to the side of the connecting block 12 away from the limiting block 13, and anti-slip patterns 16 are provided on both sides of the moving block 15.

[0050] Specifically, the setting of the moving block 15 provides a part that is easier for the staff to grasp and apply force. Especially when it is necessary to rotate the connecting block 12 to operate the limiting component, this not only makes the manual operation more labor-saving but also improves the operation accuracy, ensuring that the limiting component can be smoothly and correctly opened or closed; the anti-slip patterns 16 on both sides of the moving block 15 increase the friction between the fingers and the moving block 15, ensuring a good grip even in the case of glove operation or wet hands, avoiding misoperation caused by slippery hands, and improving the operation stability and safety.

[0051] As a preferred technical solution of the present invention, two symmetrically arranged sliding rods 18 are fixedly connected to the bottom surface of the liquid cooling plate 1, and sliding grooves 17 corresponding to the positions of the sliding rods 18 are provided on the surface of the support plate 4.

[0052] Specifically, the setting of the sliding rods 18 and the sliding grooves 17 can ensure that the liquid cooling plate 1 closely slides along the support plate 4, ensuring that the liquid cooling plate 1 can slide smoothly in a straight line during the installation or disassembly process, avoiding tilting or deviation, and thus ensuring the installation accuracy and efficiency.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A radiator for an energy storage system, comprising a liquid cooling plate, a fixing frame connected below the liquid cooling plate, and an energy storage battery connected above the liquid cooling plate, characterized in that: The bottom surface of the liquid cooling plate is slidably connected to a support plate, both sides of the bottom surface of the support plate are in contact with the surface of the fixed frame, and both sides of the support plate are fixedly connected to support rods, and a plurality of connection holes are equidistantly provided on the surface of each support rod, and a pressure spring is fixedly connected in the connection hole, and two movable plates are fixedly connected to the top of the pressure spring, and the positions of the movable plates and the support rods correspond, and the surface of the movable plate is in contact with the surface of the energy storage battery, and each support rod is connected to a limiting assembly at one end, and a lifting assembly is connected to one end of the movable plate, and the limiting assembly includes a rotating shaft, a rotating block, a connecting block and a limiting block, and a connecting groove is provided at one end of the support rod, the rotating shaft is fixedly connected to the connecting groove, the rotating block is rotatably connected to the rotating shaft, and the connecting block is connected to the rotating block. Fixed connection, one side of the top of the connecting block is fixedly connected to the limiting block, the bottom surface of the limiting block is fitted with the surface of the moving plate, the lifting assembly includes a connecting plate and a lifting plate, the connecting plate is fixedly connected to the side of the liquid cooling plate away from the limiting block, the two ends of the lifting plate are respectively fixedly connected to the side of the two moving plates away from the limiting block, one side of the connecting plate is fitted with the lifting plate, the two sides of the connecting plate are respectively set as surface a and surface c, one side of the lifting plate is set as surface b, surface a, surface b and surface c are all inclined surfaces, and are all parallel surfaces, surface a is fitted with surface b, surface c is fitted with one side of the energy storage battery, the side of the liquid cooling plate away from the connecting plate is fixedly connected to the limiting plate, and one side of the limiting plate is fitted with the side wall of the energy storage battery.

2. The energy storage system radiator according to claim 1, characterized in that: The surface of the liquid cooling plate is fixedly connected with a phase change sheet, and the bottom surface of the energy storage battery is in contact with the surface of the phase change sheet.

3. The energy storage system radiator according to claim 2, characterized in that: A plurality of heat-conducting grooves are provided on the surface of the liquid cooling plate, and the bottom surface of the phase change sheet is in contact with the heat-conducting grooves.

4. The energy storage system radiator according to claim 3, characterized in that: A handle is fixedly connected to one side of the liquid cooling plate close to the limiting block, and an anti-slip sleeve is provided on the outer wall of the handle.

5. The energy storage system radiator according to claim 4, characterized in that: A plurality of moving rods are fixedly connected to the bottom surface of the moving plate, and the positions of the moving rods correspond to the connection holes.

6. The energy storage system radiator according to claim 5, characterized in that: A positioning block is fixedly connected to one side of the bottom of the connecting block, and a positioning groove corresponding to the position of the positioning block is opened at one end of the supporting rod.

7. The energy storage system radiator according to claim 6, characterized in that: The side of the connecting block away from the limiting block is fixedly connected with the moving block, and both sides of the moving block are provided with anti-slip grooves.

8. The energy storage system radiator according to claim 7, characterized in that: The bottom surface of the liquid cooling plate is fixedly connected to two symmetrically arranged sliding rods, and the surface of the support plate is provided with sliding grooves corresponding to the positions of the sliding rods.

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