Novel expansion equipment

Abstract

The utility model relates to novel expansion equipment which comprises an expansion assembly and a driving assembly, the expansion assembly comprises an expansion shaft sleeve and an expansion male die, the driving assembly comprises a conical rod, the conical rod is used for driving the expansion male die to move in the radial direction, a connector is arranged outside the expansion male die in a sleeved mode, a positioning groove is formed in the outer wall of the expansion shaft sleeve, and a buckle is arranged outside the connector. The buckle is matched with the positioning groove, the length of the positioning groove is larger than that of the buckle, and the connector rotates along the positioning groove. By rotating the joint, the copper sleeve in the joint can change the abutting position of the copper sleeve and the expansion assembly, the abutting position of the copper sleeve and the expanded expansion male die is changed, the copper sleeve can be evenly stressed, and the connecting effect of the joint and a water hose is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire fighting equipment, in particular to a novel expansion device. Background Art

[0002] Inflatable water hoses (such as forest water hoses) play a vital role in forest fire prevention. Their main function is to transport water from the water source to the fire scene to form a water hose to cover the fire area, thereby preventing the spread of the fire and achieving the purpose of extinguishing the fire.

[0003] The internal expansion water hose is usually used in conjunction with the internal buckle joint (such as the forest joint). The interface is connected through the internal expansion water hose (hereinafter referred to as the water hose) and the internal buckle joint (hereinafter referred to as the joint). A copper sleeve is provided inside the joint. The water hose is inserted into the gap between the copper sleeve and the joint, and then the tightening device is inserted into the copper sleeve. The copper sleeve is expanded and deformed by the tightening device, so that the joint and the water hose are tightly connected together.

[0004] In the existing expansion equipment, the copper sleeve is squeezed by means of petal expansion blocks, and the multiple petal expansion blocks form a complete arc surface when they are contracted. However, when the petal expansion blocks act on the copper sleeve after radially expanding, there are gaps between the multiple petal expansion blocks that are not in contact with the copper sleeve, which causes uneven tension on the copper sleeve, resulting in a loose connection between the joint and the water hose, which is prone to water leakage. Utility Model Content

[0005] The first aspect of the utility model aims to solve the technical problem that the connection between the joint and the hose is not tight due to the uneven tension of the copper sleeve caused by deformation, and provides a new expansion device, which can change the contact position of the copper sleeve in the joint with the expansion assembly by rotating the joint, so that the copper sleeve can be evenly stressed. The main concept is:

[0006] A novel expansion device includes an expansion assembly and a driving assembly for expansion joints. The expansion assembly includes a fixed expansion sleeve, the expansion sleeve is used to axially position the joint, and a positioning groove is provided on the outer wall of the expansion sleeve. The positioning groove is used to accommodate a buckle in the joint. The length of the positioning groove is greater than the length of the buckle, and the joint can rotate along the positioning groove. In this solution, a positioning groove is provided on the expansion sleeve so that the buckle provided on the joint can abut against the positioning groove, so that the joint is positioned on the expansion sleeve. After positioning, the joint is coaxially arranged with the expansion assembly, and the expansion assembly is driven by the driving assembly through a tapered rod to expand the joint. By rotating the joint, the position of the copper sleeve expansion is changed within the range of the positioning groove, so that the copper sleeve can be fully stressed, thereby improving the connection effect between the joint and the water hose.

[0007] Preferably, the positioning groove is an arc-shaped positioning groove, and the contact surface between the buckle and the positioning groove is an arc-shaped surface, and the arc-shaped surface of the buckle fits the arc-shaped positioning groove. The arc-shaped positioning groove and the buckle with the arc-shaped surface are tightly fitted, so that the positioning accuracy is high and the rotation of the joint on the positioning groove is stable.

[0008] Preferably, the length difference between the positioning groove and the buckle is 3cm-8cm.

[0009] Preferably, the joint includes a joint shell, a copper sleeve and a sealing ring. The copper sleeve is installed inside the joint shell, a hose installation cavity is formed between the copper sleeve and the joint shell, a sealing ring is arranged on the side of the hose installation cavity, and the hose installation cavity is used to connect the hose. The hose is inserted into the hose installation cavity constructed between the copper sleeve and the joint shell, so that the joint and the hose are initially positioned. The sealing ring installed in the hose installation cavity can prevent liquid leakage during use of the hose. The joint sleeve with the hose inserted is then set on the outside of the expansion assembly. The copper sleeve is subjected to radial outward tension through the expansion convex mold of the expansion assembly. After the copper sleeve is deformed, the gap width between the hose installation cavities is reduced, so that the hose can be stably connected to the joint.

[0010] Preferably, the driving assembly further comprises a hydraulic cylinder and a booster oil pump station, the hydraulic cylinder is connected to the booster oil pump station via a pipeline, a tapered rod is installed on the output shaft of the hydraulic cylinder, and the tapered rod performs linear reciprocating motion at the output end of the hydraulic cylinder. The hydraulic cylinder is connected to the booster oil pump station via an oil pipe, and the booster oil pump station transmits the hydraulic oil to the cylinder body of the hydraulic cylinder via an external oil pipe after adjusting the direction, pressure and flow rate of the hydraulic oil through a hydraulic valve, thereby controlling the change of direction, force and speed of the tapered rod at the output end of the hydraulic cylinder, and driving the tapered rod to perform reciprocating motion in the expansion assembly.

[0011] Preferably, the expansion sleeve is a cylindrical structure, the inner wall of the expansion sleeve is a tapered through hole, the tapered rod is inserted into the tapered through hole, and the end surface of the expansion sleeve is radially evenly provided with a plurality of slide grooves. The expansion sleeve is provided with a tapered through hole, and the tapered through hole can limit the movement of the tapered rod when the tapered through hole and the expansion sleeve are tightly fitted, and the tapered through hole can be in surface contact with the outer wall of the tapered rod, so as to avoid stress concentration on the tapered rod when the expansion sleeve is limited, thereby preventing the outer wall of the tapered rod from being damaged.

[0012] Preferably, the expansion assembly further comprises an expansion punch, which is a cylindrical structure, and is inserted into a tapered rod. The expansion punch comprises a plurality of petal sliders, and the petal sliders are extrusion structures with a fan-shaped cross section. The end faces of the petal sliders are provided with sliding parts, and the sliding parts are slidably matched with the sliding grooves of the expansion sleeves. The sliding parts of the petal sliders in the vertical direction are embedded in the sliding grooves to achieve sliding connection. When the expansion punch is expanded and reset, the sliding grooves of the expansion sleeves guide the petal sliders.

[0013] The second aspect of the utility model aims to solve the technical problem that the expansion punch is easily stuck during the outward expansion process, resulting in uneven application of force. Furthermore, the inner wall of the petal slider is a conical arc surface, which fits the conical rod, and the outer wall of the petal slider is a top tightening surface, which abuts the copper sleeve. In this scheme, the inner wall of the petal slider is set as a conical arc surface with the same inclination angle as the conical rod, and the conical rod is tightly abutted against the petal slider. The petal slider can expand stably along the conical outer wall of the conical rod, and the top tightening surface of the outer wall of the petal slider is a surface parallel to the axis. The top tightening surface of the petal slider is always coaxial with the joint, so that the petal slider can be stably stressed when abutting against the copper sleeve.

[0014] The third aspect of the utility model aims to solve the technical problem of asynchronous guiding sliding of multiple petal sliders on the expansion sleeve when performing expansion and resetting movements. Furthermore, at least one limiting groove is provided on the petal slider, and a circumferential spring is sleeved on the limiting groove, and the depth of the limiting groove is greater than the outer diameter of the cross section of the circumferential spring. In this scheme, a limiting groove is provided on the outer wall of the petal slider for installing a circumferential spring. The circumferential spring can enable multiple petal sliders to maintain synchronous movement during expansion and resetting, and the depth of the limiting groove is set to be greater than the outer diameter of the cross section of the circumferential spring. When the tightening surface abuts against the copper sleeve, the circumferential spring will not interfere with the tightening surface of the petal slider.

[0015] Preferably, the device also includes a housing, including a cushion, a frame and a plurality of cover plates, a rectangular installation cavity is constructed between the plurality of cover plates, a drive assembly is arranged in the installation cavity, the drive assembly is connected to the frame, and a cushion is installed on the top of the frame. In this solution, a frame is arranged inside the device housing, the function of the frame is to improve the strength of the device, and a cushion is installed on the top of the frame, so that the operator can sit on the top of the device to work through the cushion, the frame can bear the weight of the human body, and avoid deformation and damage to the device body, the cushion is installed on the top of the frame, when the operator is tightening the joint, sitting on the top of the device lowers the height of the operator's operating position, and the body's center of gravity is transferred to the ischium position through the sitting posture, the overall height of the frame is 400-1000mm, the operator can sit on the cushion with both feet on the ground to provide balance for the body, will not cause fatigue damage to the knee joints and waist and back, and improve the comfort of work.

[0016] The beneficial effects of the utility model are:

[0017] The joint can be rotated so that the copper sleeve in the joint can change the abutting position with the expansion component, and the abutting position of the copper sleeve with the expanded expansion punch can be changed, so that the copper sleeve can be evenly stressed, thereby improving the connection effect between the joint and the water hose. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a structural schematic diagram of the expansion assembly of the utility model.

[0020] Figure 3 It is a structural schematic diagram of the joint of the utility model.

[0021] Figure 4 It is a structural cross-sectional view of the joint of the utility model.

[0022] Figure 5 It is a structural schematic diagram of the expansion assembly of the utility model.

[0023] Figure 6 The structure of the split-petal slider of the utility model is shown in FIG. Figure 1 .

[0024] Figure 7 The structure of the split-petal slider of the utility model is shown in FIG. Figure 2 .

[0025] Figure 8 It is a structural cross-sectional view of the expansion assembly of the utility model.

[0026] The reference numerals in the drawings include: 1. expansion sleeve; 11. arc-shaped positioning groove; 12. slide groove; 2. expansion punch; 21. split slider; 22. sliding member; 23. conical arc surface; 24. tightening surface; 25. limiting groove; 26. circular spring; 3. equipment housing; 31. cover plate; 32. frame; 33. cushion; 4. joint; 41. arc-shaped buckle; 42. joint housing; 43. copper sleeve; 44. sealing ring; 45. hose installation cavity; 5. conical rod; 6. hydraulic cylinder; 7. micro switch. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are only examples of devices and methods consistent with some aspects of the present disclosure as detailed in the attached claims.

[0028] It should be noted that all actions to obtain signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.

[0029] In the present disclosure, unless otherwise stated, the directional words used, such as "inside" and "outside", are defined according to the corresponding parts' own contours. The terms used in the present disclosure, such as "first" and "second", etc., are used to distinguish one element from another element and do not have order and importance.

[0030] Embodiment 1:

[0031] like Figure 1-Figure 2 As shown, it includes a tightening assembly and a driving assembly for tightening the joint, the tightening assembly includes a fixedly installed tightening sleeve 1, the tightening sleeve 1 is used for axially positioning the joint 4, the outer wall of the tightening sleeve 1 is provided with a positioning groove 11, the positioning groove 11 is used to accommodate the buckle 41 in the joint 4, the length of the positioning groove 11 is greater than the length of the buckle 41, and the joint 4 can rotate along the positioning groove 11.

[0032] The driving component drives the expansion component to expand and tighten the joint through the tapered rod. By rotating the joint, the position of the copper sleeve expansion can be changed within the range of the positioning groove, so that the copper sleeve can be fully stressed and the connection effect between the joint and the water hose is improved.

[0033] The positioning groove 11 of this embodiment is an arc-shaped positioning groove, and the contact surface of the buckle 41 and the positioning groove 11 is an arc-shaped surface, and the arc-shaped surface of the buckle 41 fits the arc-shaped positioning groove. This embodiment adopts a method of tightly fitting the arc-shaped positioning groove and the buckle with an arc-shaped surface, so that the positioning accuracy of the joint 4 and the expansion assembly is high, and the rotation of the joint 4 on the positioning groove 11 is stable.

[0034] Preferably, the length difference between the positioning groove 11 and the buckle 41 is 3 cm-8 cm.

[0035] like Figure 3-Figure 4 As shown, the joint 4 includes a joint shell 42, a copper sleeve 43 and a sealing ring 44. The copper sleeve 43 is coaxially installed inside the joint shell 42. A hose installation cavity 45 is formed between the copper sleeve 43 and the joint shell 42. A sealing ring 44 is arranged on the side of the hose installation cavity 45. The hose installation cavity 45 is used to connect the hose. The hose is inserted into the hose installation cavity 45 constructed between the copper sleeve 43 and the joint shell 42, so that the joint 4 and the hose are preliminarily positioned. The sealing ring 44 is installed in the hose installation cavity 45 to prevent the hose from leaking liquid during use. Then, the joint 4 with the hose inserted is sleeved on the outside of the expansion assembly. The copper sleeve 43 is subjected to radial outward tension through the expansion convex mold of the expansion assembly. After the copper sleeve 43 is deformed, the gap width between the hose installation cavity 45 is reduced, so that the hose can be stably connected to the joint 4.

[0036] like Figure 1As shown, the driving assembly also includes a hydraulic cylinder 6 and a booster oil pump station. The hydraulic cylinder 6 is connected to the booster oil pump station through a pipeline. The output shaft of the hydraulic cylinder 6 is installed with a tapered rod 5, and the tapered rod 5 performs linear reciprocating motion at the output end of the hydraulic cylinder.

[0037] The hydraulic cylinder 6 is connected to the booster oil pump station through an oil pipe. The booster oil pump station adjusts the direction, pressure and flow of the hydraulic oil through a hydraulic valve and then transmits it to the cylinder body of the hydraulic cylinder through an external oil pipe, thereby controlling the change of direction, force and speed of the tapered rod 5 at the output end of the hydraulic cylinder 6, and driving the tapered rod 5 to reciprocate in the expansion assembly.

[0038] Furthermore, the driving component is electrically connected to the power supply component, which supplies power to the driving component and other electrical devices. The power supply component includes a battery, a power cord, and an aviation plug socket. The battery is installed inside the device housing 3 of the tensioning device, so that the power supply component can be transported and moved synchronously with the tensioning device.

[0039] The battery is connected to the drive assembly; one end of the power cord is connected to the battery, and the other end is connected to the aviation socket, which can be set in the device housing 3. When in use, the connecting wires with the aviation plug connector can be connected to the mains and the aviation sockets of the battery respectively, and the connecting wires power the battery. This connection method can ensure continuous power supply and can also charge the battery. It can play a role when there is no mains interface or power outage outdoors. At the same time, the voltage of the battery can improve the stability of the output voltage of the power supply and ensure the normal operation of the equipment.

[0040] Embodiment 2:

[0041] like Figure 8 As shown, the expansion sleeve 1 is a cylindrical structure, the inner wall of the expansion sleeve 1 is a tapered through hole, the tapered rod 5 is inserted into the tapered through hole, and the end surface of the expansion sleeve 1 is radially evenly provided with a plurality of slide grooves 12. The expansion sleeve 1 is provided with a tapered through hole, and the tapered through hole can limit the movement of the tapered rod 5 when the tapered through hole and the expansion sleeve 1 are tightly fitted, and the tapered through hole can be in surface contact with the outer wall of the tapered rod 5, so as to avoid stress concentration caused by the tapered rod 5 when the expansion sleeve 1 is limited, thereby causing damage to the outer wall of the tapered rod 5.

[0042] like Figure 5-Figure 7 As shown, the expansion punch 2 is a cylindrical structure, and a conical rod 5 is axially inserted into the middle hollow part of the expansion punch 2. The expansion punch 2 includes a plurality of split sliders 21. The split sliders 21 are extrusion structures with a fan-shaped cross section. The end faces of the split sliders 21 are provided with sliding parts 22, and the sliding parts 22 are slidably matched with the slide groove 12 of the expansion sleeve 1.

[0043] The sliding piece 22 in the vertical direction of the split slider 21 is embedded in the sliding groove 12 to achieve sliding connection. When the expansion punch 2 is expanded and reset, the sliding groove 12 of the expansion sleeve 1 can guide the split slider 21.

[0044] like Figure 8 As shown, in this embodiment, the expansion sleeve 1 is installed on the end face of the hydraulic cylinder 6, and displacement and movement are not easy to occur between the tapered rod 5 of the hydraulic cylinder 6 and the expansion assembly, and the hydraulic cylinder 6 is positioned and installed by an annular mounting frame arranged on the equipment housing 3, so that the output end of the hydraulic cylinder 6, the tapered rod 5 that reciprocates in the cylinder body and the expansion sleeve 1 are kept coaxially arranged, thereby improving the accuracy of the expansion action on the joint between the drive assembly and the expansion mechanism assembly.

[0045] Embodiment 3:

[0046] like Figure 6-Figure 7 As shown, the inner wall of the split slider 21 of this embodiment is a conical arc surface 23, which fits the conical rod 5, and the outer wall of the split slider 21 is a pressing surface 24, which abuts against the copper sleeve 43. In this solution, the inner wall of the split slider 21 is set as a conical arc surface 23 with the same inclination angle as the conical rod 5, and the conical rod 5 abuts against the split slider 21. The split slider 21 can expand stably along the conical outer wall of the conical rod 5, and the pressing surface 24 of the outer wall of the split slider 21 is parallel to the axis, and the pressing surface 24 of the split slider 21 is always coaxial with the joint 4, so that the split slider 21 can be stably stressed when abutting against the copper sleeve.

[0047] The split slider 21 of this embodiment is provided with two limiting grooves 25, and a circumferential spring 26 is mounted on both limiting grooves 25. In this solution, limiting grooves 25 are provided on the outer wall of the split slider 21 for installing the circumferential spring 26. The circumferential spring 26 enables the multiple split sliders 21 to maintain synchronous movement during expansion and resetting.

[0048] The depth of the limiting groove 25 is greater than the cross-sectional outer diameter of the circumferential spring 26 . Therefore, when the pressing surface 24 abuts against the copper sleeve 43 , the circumferential spring 26 will not interfere with the pressing surface 24 of the split slider 21 .

[0049] A micro switch 7 is installed on the outer wall of the expansion sleeve, and the micro switch 7 is electrically connected to the hydraulic cylinder 6. When the joint 4 is positioned on the expansion sleeve 1, the micro switch 7 provided on the expansion sleeve 1 automatically triggers the tapered rod 5 of the hydraulic cylinder to reciprocate, driving the expansion sleeve to gradually expand the joint 4, thereby simplifying the installation steps of the sleeve.

[0050] In this embodiment, a positioning groove 11 is provided on the expansion sleeve so that the buckle 41 provided on the joint 4 can abut against the positioning groove 11, so that the joint 4 is positioned on the expansion sleeve 1. The positioned joint 4 is coaxially arranged with the expansion punch 2 of the expansion assembly, and the driving assembly starts the conical rod 5 to perform linear movement in the expansion assembly. When the outer diameter of the outer wall of the conical rod 5 continues to increase, the expansion punch expands, and the expanded expansion punch exerts a force on the copper sleeve, so that the abutment position between the copper sleeve and the expanded expansion punch is deformed; the driving assembly controls the conical rod 5 to move in the opposite direction, so that the expansion punch 2 is reset, and then the joint 4 is rotated so that the copper sleeve in the joint 4 also rotates synchronously, thereby changing the abutment position between the copper sleeve and the expanded expansion punch, so that the copper sleeve can be fully stressed.

[0051] Embodiment 4:

[0052] On the basis of Example 1, the tightening device of this embodiment also includes a device housing 3, which includes a cushion 32, a frame 33 and multiple cover plates 31, a rectangular installation cavity is constructed between the multiple cover plates 31, a drive assembly is arranged in the installation cavity, the drive assembly is connected to the frame 33, and the cushion 32 is installed on the top of the frame 33.

[0053] In this embodiment, a frame 33 is provided inside the device shell 3. The function of the frame 33 is to improve the strength of the device, and a cushion 32 is installed on the top of the frame 33 so that the operator can sit on the top of the device to work through the cushion 32. The frame 33 can bear the weight of the human body to avoid deformation and damage to the device body 3. The cushion 32 is installed on the top of the frame 33. When the operator is tightening the joint, the height of the operator's operating position is lowered by sitting on the top of the device, and the center of gravity of the body is transferred to the ischium position through the sitting posture. The overall height of the frame is 400-1000mm. When the operator sits on the cushion 32, his feet can touch the ground to provide balance for the body, which will not cause fatigue damage to the knee joints and waist and back, thereby improving the comfort of work.

[0054] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A new type of expansion equipment, characterized by: The invention comprises an expansion assembly and a driving assembly for an expansion joint, wherein the expansion assembly comprises a fixedly installed expansion sleeve (1), the expansion sleeve (1) is used for axially positioning the joint (4), a positioning groove (11) is provided on the outer wall of the expansion sleeve (1), the positioning groove (11) is used for accommodating a buckle (41) in the joint (4), the length of the positioning groove (11) is greater than the length of the buckle (41), and the joint (4) can rotate along the positioning groove (11).

2. A novel expansion device according to claim 1, characterized in that: The positioning groove (11) is an arc-shaped positioning groove, and the contact surface between the buckle (41) and the positioning groove (11) is an arc-shaped surface, and the arc-shaped surface of the buckle (41) fits the arc-shaped positioning groove.

3. A novel expansion device according to claim 1, characterized in that: The length difference between the positioning groove (11) and the buckle (41) is 3 cm to 8 cm.

4. A novel expansion device according to claim 1, characterized in that: The joint (4) comprises a joint shell (42), a copper sleeve (43) and a sealing ring (44); the copper sleeve (43) is installed inside the joint shell (42); a water hose installation cavity (45) is formed between the copper sleeve (43) and the joint shell (42); a sealing ring (44) is arranged on the side of the water hose installation cavity (45); and the water hose installation cavity (45) is used to connect a water hose.

5. A novel expansion device according to claim 1, characterized in that: The driving assembly also includes a hydraulic cylinder (6) and a booster oil pump station. The hydraulic cylinder (6) is connected to the booster oil pump station via a pipeline. The output shaft of the hydraulic cylinder (6) is equipped with a tapered rod (5). The tapered rod (5) performs linear reciprocating motion at the output end of the hydraulic cylinder.

6. A novel expansion device according to claim 1, characterized in that: The expansion sleeve (1) is a cylindrical structure, the inner wall of the expansion sleeve (1) is a tapered through hole, a tapered rod (5) is inserted into the tapered through hole, and a plurality of sliding grooves (12) are evenly distributed radially on the end surface of the expansion sleeve (1).

7. A novel expansion device according to claim 1, characterized in that: The expansion assembly also includes an expansion punch (2), which is a cylindrical structure. The expansion punch (2) is inserted into the conical rod (5). The expansion punch (2) includes a plurality of split sliders (21). The split sliders (21) are extrusion structures with a fan-shaped cross section. The end faces of the split sliders (21) are provided with sliding parts (22), and the sliding parts (22) are slidably matched with the sliding grooves (12) of the expansion sleeve (1).

8. A novel expansion device according to claim 7, characterized in that: The inner wall of the split slider (21) is a conical arc surface (23), which fits the conical rod (5); the outer wall of the split slider (21) is a pressing surface (24), which abuts against the copper sleeve (43).

9. A novel expansion device according to claim 7, characterized in that: At least one limiting groove (25) is provided on the petal sliding block (21), a circumferential spring (26) is sleeved on the limiting groove (25), and the depth of the limiting groove (25) is greater than the cross-sectional outer diameter of the circumferential spring (26).

10. A novel expansion device according to any one of claims 1 to 9, characterized in that: The device also includes a device housing (3), the device housing (3) including a seat cushion (32), a frame (33) and a plurality of cover plates (31), a rectangular installation cavity is constructed between the plurality of cover plates (31), a drive assembly is arranged in the installation cavity, the drive assembly is connected to the frame (33), and the seat cushion (32) is installed on the top of the frame (33).

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