An assembled precision casting ejection block

Abstract

The application belongs to the technical field of bridge construction, and particularly relates to an assembled precision casting unloading block, which comprises an upper support, a lower support and side supports, the upper surface of the upper support and the lower surface of the lower support are both fixedly connected with protective pads, an integrated box is arranged between the upper support and the lower support, the inner wall of the integrated box is respectively provided with a driving device and a transmission device, and the inner wall of the lower support is provided with a stop device. The assembled precision casting unloading block is provided with the stop device, when the slide block seat moves in the guide sliding groove, the stop gear rotates along with the movement of the slide block seat, after the height adjustment of the unloading block is completed, the spline shaft is inserted into the deepest part of the insertion slot, the part with external teeth of the spline shaft is inserted with the stop gear to limit the stop gear in the circumferential direction, the insertion slot limits the spline shaft in the circumferential direction, the stop gear is engaged with the stop groove, and then the two side supports are prevented from sliding downward due to the bearing, and the safety of the unloading block is improved.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a prefabricated precision-cast unloading block. Background Technology

[0002] Precast prefabricated blocks are a new type of building material that has been widely used in the construction field in recent years. They are made by first precision casting concrete or other materials in a factory to produce prefabricated components, and then transporting these components to the construction site for assembly.

[0003] In the existing technology, the design and construction of formwork supports need to consider the adjustment and control methods of construction elevation, as well as the measures for dismantling the supports after the main concrete structure is poured. The common practice is to use unloading sand cylinders or short steel sections. However, these traditional unloading devices are generally disposable materials, with high material input costs, high labor costs for manufacturing, installation and dismantling, and inconvenient operation and low safety. Summary of the Invention

[0004] Given that existing unloading devices generally use disposable materials, resulting in high material costs, high labor costs for manufacturing, installation, and dismantling, as well as inconvenient operation and low safety, this invention proposes an assembled precision-cast unloading block.

[0005] The present invention proposes an assembled precision casting unloading block, comprising an upper support, a lower support, and a side support. The upper surface of the upper support and the lower surface of the lower support are both fixedly connected with protective pads. The opposing surfaces of the upper support and the lower support are each provided with a guide groove with an inner wall in the shape of a T. An integrated box is provided between the upper support and the lower support. The inner wall of the integrated box is respectively equipped with a driving device and a transmission device. The inner wall of the lower support is equipped with a stop device.

[0006] The drive device is used to control the operation of the transmission device, and the drive device includes a geared motor.

[0007] The transmission device is used to control the upper support, the lower support and the two side supports to move in all directions. The transmission device includes two sets of lifting mechanisms arranged symmetrically in front and behind and two sets of moving mechanisms arranged symmetrically in the left and right.

[0008] The stop device prevents the distance between the upper support and the lower support from changing after the distance between the upper support and the lower support has been adjusted.

[0009] Preferably, the inner bottom wall of the integrated box has an installation port for installing the geared motor. The geared motor is mounted on a drive shaft through a gearbox. Both ends of the drive shaft are fixedly sleeved with transmission gears and drive bevel gears.

[0010] The above technical solution allows for the installation of a geared motor via an mounting port and the installation of a drive shaft via a gearbox. The rotation of the drive shaft controls the synchronous rotation of the transmission gear and the drive bevel gear.

[0011] Preferably, the lifting mechanism includes two transmission rods arranged symmetrically at the top and bottom, and driven bevel gears are fixedly sleeved on the opposite surfaces of the two transmission rods. The two driven bevel gears mesh with the driving bevel gear. The upper surface of the integrated box has two symmetrically arranged sleeve interfaces that extend to its lower surface. The transmission rods are installed in the sleeve interfaces through bearings. Threaded grooves are opened on the outer surfaces of both ends of the transmission rods.

[0012] The above technical solution controls the rotation of the active bevel gear through the drive shaft, controls the rotation of the two transmission rods through the meshing of the active and driven bevel gears, and installs the transmission rods through the sleeve interface.

[0013] Preferably, the upper support and the lower support each have a placement opening on their opposite surfaces. One end of the placement opening has an inner wall with a receiving cavity that is movably fitted with the outer surface of the transmission rod. A rotating disk threadedly fitted with the outer surface of the transmission rod is installed on the inner wall of the placement opening.

[0014] Through the above technical solution, when the transmission rod rotates, it controls the longitudinal movement of the upper and lower supports through the cooperation between the transmission rod and the rotating disk.

[0015] Preferably, the moving mechanism includes connection ports and limiting slide grooves opened on the inner walls of both sides of the integrated box. An L-shaped push frame is slidably inserted into the inner wall of the limiting slide groove, and an engagement groove is opened on the transverse surface of the push frame.

[0016] Through the above technical solution, the limiting groove guides and limits the push frame, and the meshing groove on the push frame facilitates the control of the push frame by the transmission gear.

[0017] Preferably, a plug rod is fixedly connected to the vertical surface of the push frame, the outer surface of the plug rod is movably inserted into the inner wall of the connection port, and one end surface of the push frame is provided with a plug that movably engages with the outer surface of the plug rod installed on another push frame.

[0018] The above technical solution guides the insertion rod through the connection port, and the stability between the two pushers is increased by the insertion rod installed on one pusher and the insertion port on the other pusher.

[0019] Preferably, the meshing grooves of the two vertically distributed push frames mesh with the transmission gear, and the end surfaces of the two push frames away from the integrated box are respectively fixedly connected to one side surface of the two side supports.

[0020] Through the above technical solution, the two transmission gears cooperate with the two vertically distributed push frames to control the two push frames to move synchronously in opposite directions, and control the two side supports to move along the sides of the lower support and the upper support.

[0021] Preferably, the stopping device includes slots formed in the inner walls of the upper support and the lower support, a rotating cavity is formed in the inner wall of the guide groove, a spline shaft is movably inserted into the inner wall of the slot, two annular openings are formed on the outer surface of the spline shaft, and a stopping gear is sleeved in the inner wall of the rotating cavity and movably inserted into the outer surface of the spline shaft.

[0022] With the above technical solution, when the two annular sleeve sections on the outside of each spline shaft are engaged with the stop gear, the stop gear loses its circumferential limit and can rotate circumferentially under the action of external force. If other parts of the spline shaft are engaged with the stop gear, the stop gear cannot rotate because the external teeth of the spline shaft engage with the stop gear to circumferentially limit the stop gear.

[0023] Preferably, the upper and lower surfaces of the two side supports are fixedly connected with slide rail seats that slide into the inner wall of the guide groove. A stop groove is provided on the side surface of the slide rail seat away from the side support, and the stop gear meshes with the stop groove for transmission.

[0024] With the above technical solution, the spline shaft is inserted to the deepest part of the slot, and the part of the spline shaft with external teeth is inserted into the stop gear to circumferentially limit the stop gear. The slot circumferentially limits the spline shaft, and the stop gear meshes with the stop groove, thereby preventing the two side supports from sliding down due to the load.

[0025] Preferably, a mating bar is fixedly connected to one end surface of the two splined shafts, a screw is fixedly connected to one end surface of the lower support, the outer surface of the screw is movably sleeved with the inner wall of the middle part of the mating bar, and a fastening nut is threadedly connected to the outer surface of the screw.

[0026] Through the above technical solution, the screw guides the mating bar, and the mating bar is limited by the cooperation of the fastening nut and the screw, preventing the spline shaft from moving.

[0027] The beneficial effects of this invention are as follows:

[0028] 1. By setting up a drive unit, the gearbox of the geared motor is installed on the drive shaft, and the gear set inside the gearbox controls the rotation of the drive shaft, thereby controlling the transmission gear and the drive bevel gear to rotate synchronously. The structure at both ends is controlled by a single drive unit to operate synchronously. The structure is simple, has strong linkage, and has low manufacturing cost.

[0029] 2. By setting up a transmission device, two transmission gears cooperate with two upper and lower distributed push frames to control the two push frames to move synchronously in opposite directions. At the same time, two active bevel gears drive two driven bevel gears to rotate, controlling the rotation of two upper and lower symmetrical transmission rods. The distance between the upper support and the lower support is adjusted synchronously in opposite directions through the threaded cooperation between the transmission rods and the rotating disk. The operation is convenient and the structure can be stably matched, and it can be used repeatedly.

[0030] 3. By setting a stop device, when the slide block moves in the guide groove, the stop gear will rotate with the movement of the slide block. After the height of the unloading block is adjusted, the spline shaft is inserted to the deepest part of the slot. The part of the spline shaft with external teeth is inserted into the stop gear to circumferentially limit the stop gear. The slot circumferentially limits the spline shaft. The stop gear meshes with the stop groove, thereby preventing the two side supports from sliding down due to the load and improving the safety of the unloading block. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of an assembled precision-cast unloading block proposed in this invention;

[0032] Figure 2 This is a perspective view of a side support structure for an assembled precision-cast unloading block proposed in this invention.

[0033] Figure 3 This is a perspective view of the transmission rod structure of an assembled precision-cast unloading block proposed in this invention;

[0034] Figure 4 This is a perspective view of a limiting slide structure for an assembled precision-cast unloading block proposed in this invention.

[0035] Figure 5 This is a perspective view of an integrated box structure for a prefabricated precision-cast unloading block proposed in this invention.

[0036] Figure 6 This is a perspective view of the lower support structure of an assembled precision-cast unloading block proposed in this invention.

[0037] Figure 7 This is a perspective view of a pusher frame structure for an assembled precision-cast unloading block proposed in this invention;

[0038] Figure 8This is a perspective view of the slide block structure of an assembled precision-cast unloading block proposed in this invention.

[0039] In the diagram: 1. Upper support; 2. Lower support; 21. Side support; 3. Protective pad; 4. Guide groove; 5. Integrated box; 6. Gear motor; 61. Drive shaft; 62. Transmission gear; 63. Driving bevel gear; 7. Transmission rod; 71. Driven bevel gear; 72. Sleeve interface; 73. Placement port; 74. Rotary disk; 75. Connection port; 76. Limiting groove; 77. Push frame; 78. Meshing groove; 79. Insert rod; 710. Insertion port; 8. Slot; 81. Rotating cavity; 82. Splined shaft; 83. Annular sleeve; 84. Stop gear; 85. Slide bar seat; 86. Stop groove; 87. Connecting bar; 88. Screw; 89. Fastening nut. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] Reference Figures 1-8 An assembled precision-cast unloading block includes an upper support 1, a lower support 2, and side supports 21. Protective pads 3 are fixedly connected to the upper surface of the upper support 1 and the lower surface of the lower support 2, providing protection for the upper support 1 and the lower support 2. To guide the two side supports 21, guide grooves 4 with T-shaped inner walls are formed on the opposing surfaces of the upper support 1 and the lower support 2. An integrated box 5 is provided between the upper support 1 and the lower support 2. A driving device and a transmission device are respectively installed on the inner wall of the integrated box 5. A stop device is installed on the inner wall of the lower support 2.

[0042] like Figures 1-5 As shown, the drive device is used to control the operation of the transmission device. The drive device includes a geared motor 6. In order to install the geared motor 6 in the integrated box 5, an installation port for installing the geared motor 6 is provided in the inner bottom wall of the middle part of the integrated box 5. The geared motor 6 is mounted on a drive shaft 61 through a gearbox. In order to simultaneously control the movement of the upper support 1, the lower support 2 and the two side supports 21, transmission gears 62 and driving bevel gears 63 are fixedly sleeved on the outer surfaces of both ends of the drive shaft 61. The geared motor 6 is installed through the installation port, and the drive shaft 61 is installed through the gearbox. The rotation of the drive shaft 61 controls the transmission gears 62 and the driving bevel gears 63 to rotate synchronously.

[0043] By setting up a drive unit, the gearbox of the geared motor 6 is installed on the drive shaft 61, and the gear set inside the gearbox controls the drive shaft 61 to rotate, thereby controlling the transmission gear 62 and the active bevel gear 63 to rotate synchronously. The structure at both ends is controlled by a single drive unit to operate synchronously. The structure is simple and has strong linkage, and the manufacturing cost is low.

[0044] like Figures 1-7 As shown, the transmission device is used to control the upper support 1, the lower support 2, and the two side supports 21 to move in all directions. The transmission device includes two sets of lifting mechanisms arranged symmetrically front and rear and two sets of moving mechanisms arranged symmetrically left and right. The lifting mechanism includes two transmission rods 7 arranged symmetrically up and down. In order to control the two transmission rods 7 to rotate synchronously, driven bevel gears 71 are fixedly sleeved on the opposite surfaces of the two transmission rods 7, so that the two driven bevel gears 71 mesh with the driving bevel gear 63. In order to install the two transmission rods 7, two symmetrically arranged sleeve interfaces 72 are opened on the upper surface of the integrated box 5 and extend to its lower surface, so that the transmission rods 7 are installed in the sleeve interfaces 72 by bearings. The outer surfaces of both ends of the transmission rods 7 are provided with threaded grooves. The drive shaft 61 controls the driving bevel gear 63 to rotate. The meshing of the driving bevel gear 63 and the driven bevel gear 71 controls the rotation of the two transmission rods 7, and the transmission rods 7 are installed through the sleeve interfaces 72.

[0045] To control the raising and lowering of the upper support 1 and the lower support 2 as the transmission rod 7 rotates, placement openings 73 are provided on the opposing surfaces of the upper support 1 and the lower support 2. Furthermore, a receiving cavity is formed on the inner wall of one end of each placement opening 73, which movably engages with the outer surface of the transmission rod 7. A rotating disk 74, threaded onto the outer surface of the transmission rod 7, is installed on the inner wall of the placement opening 73. When the transmission rod 7 rotates, the longitudinal movement of the upper support 1 and the lower support 2 is controlled by the cooperation between the transmission rod 7 and the rotating disk 74. The moving mechanism includes... The integrated box 5 includes connection ports 75 and limiting grooves 76 on both sides of the inner wall. An L-shaped push frame 77 is slidably inserted into the inner wall of the limiting groove 76. The limiting groove 76 guides the push frame 77. Furthermore, in order to control the movement of the push frame 77 by rotating the transmission gear 62, a meshing groove 78 is provided on the transverse surface of the push frame 77. The limiting groove 76 guides and limits the push frame 77, and the meshing groove 78 on the push frame 77 facilitates the control of the push frame 77 by the transmission gear 62.

[0046] To increase the stability between the two pushers 77, a rod 79 is fixedly connected to the vertical surface of each pusher 77. To guide the rod 79, its outer surface is movably inserted into the inner wall of the connection port 75. One end of each pusher 77 has a slot 710 that movably engages with the outer surface of the rod 79 mounted on the other pusher 77, allowing the two pushers 77 to be connected end-to-end. The connection port 75 guides the rod 79, and the rod 79 mounted on one pusher 77 connects to the slot 710 on the other pusher 77. 10. To increase the stability between the two push frames 77, the meshing grooves 78 of the two vertically distributed push frames 77 mesh with the transmission gear 62. In order to control the movement of the side supports 21 by moving the push frames 77, the end surfaces of the two push frames 77 away from the integrated box 5 are respectively fixedly connected to one side surface of the two side supports 21. The two transmission gears 62 cooperate with the two vertically distributed push frames 77 to control the two push frames 77 to move synchronously in opposite directions, and control the two side supports 21 to move along both sides of the lower support 2 and the upper support 1.

[0047] By setting up a transmission device, two transmission gears 62 cooperate with two vertically distributed push frames 77 to control the two push frames 77 to move synchronously in opposite directions. At the same time, two active bevel gears 63 drive two driven bevel gears 71 to rotate, controlling the two vertically symmetrical transmission rods 7 to rotate. The threaded cooperation between the transmission rods 7 and the rotating disk 74 controls the synchronous and reverse distance adjustment between the upper support 1 and the lower support 2. The operation is convenient and the structure can be stably coordinated, and it can be used repeatedly.

[0048] like Figures 1-2 , Figure 6 and Figure 8As shown, the stopping device prevents changes in the distance between the upper support 1 and the lower support 2 after the distance between them is adjusted. The stopping device includes slots 8 formed on the inner walls of the upper support 1 and the lower support 2. A rotating cavity 81 is formed on the inner wall of the guide groove 4. To limit the circumferential movement of the spline shaft 82, the spline shaft 82 is movably inserted into the inner wall of the slot 8. Furthermore, to allow the state of the stop gear 84 outside the spline shaft 82 to be changed according to specific needs, the stop gear 84 is positioned on the inner wall of the slot 8. Two annular openings 83 are provided on the outer surface of the key shaft 82. A stop gear 84 is sleeved on the inner wall of the rotating cavity 81 and is movably inserted into the outer surface of the spline shaft 82. When the two annular openings 83 on the outside of each spline shaft 82 are engaged with the stop gear 84, the stop gear 84 loses its circumferential limit and can rotate circumferentially under the action of external force. If other parts of the spline shaft 82 are engaged with the stop gear 84, the stop gear 84 cannot rotate because the external teeth of the spline shaft 82 engage with the stop gear 84 to circumferentially limit the stop gear 84.

[0049] To facilitate the movement of the side supports 21, slide rail seats 85 are fixedly connected to the upper and lower surfaces of both side supports 21, and are slidably inserted into the inner wall of the guide groove 4. To prevent the slide rail seats 85 from moving after the side supports 21 have moved to the designated position, a stop groove 86 is provided on the side surface of the slide rail seat 85 away from the side supports 21, so that the stop gear 84 meshes with the stop groove 86 for transmission. The spline shaft 82 is inserted to the deepest part of the slot 8, and the part of the spline shaft 82 with external teeth is inserted into the stop gear 84 to circumferentially limit the stop gear 84. The slot 8 circumferentially limits the spline shaft 82, and the stop gear 84 meshes with the stop groove 86, thereby preventing the two side supports 21 from sliding down due to the load.

[0050] To control both splined shafts 82 simultaneously, mating strips 87 are fixedly connected to one end surface of each splined shaft 82. Furthermore, to prevent the mating strips 87 from loosening and affecting the connection between the splined shafts 82 and the stop gear 84, a screw 88 is fixedly connected to one end surface of the lower support 2. The outer surface of the screw 88 is movably sleeved with the inner wall of the middle part of the mating strip 87. A fastening nut 89 is threaded onto the outer surface of the screw 88. The screw 88 guides the mating strip 87, and the mating strip 87 is limited by the cooperation of the fastening nut 89 and the screw 88, preventing the splined shafts 82 from moving.

[0051] By setting a stop device, when the slide block 85 moves in the guide groove 4, the stop gear 84 will rotate with the movement of the slide block 85. After the height of the unloading block is adjusted, the spline shaft 82 is inserted into the deepest part of the slot 8. The part of the spline shaft 82 with external teeth is inserted into the stop gear 84 to circumferentially limit the stop gear 84. The slot 8 circumferentially limits the spline shaft 82. The stop gear 84 meshes with the stop groove 86, thereby preventing the two side supports 21 from sliding down due to the load and improving the safety of the unloading block.

[0052] Working principle: When in use, the unloading block is placed under the support bracket that needs to be supported. The geared motor 6 is started, which drives the drive shaft 61 to rotate. The two transmission gears 62 cooperate with the two vertically distributed push frames 77 to control the two push frames 77 to move synchronously in opposite directions. This controls the two side supports 21 to move along the sides of the lower support 2 and the upper support 1. The two vertically distributed push frames 77 are connected by the insertion rod 79 to increase stability. At the same time, the two active bevel gears 63 drive the two driven bevel gears 71 to rotate, controlling the two vertically symmetrical transmission rods 7 to rotate. The threaded cooperation between the transmission rods 7 and the rotating disk 74 controls the synchronous and reverse distance adjustment between the upper support 1 and the lower support 2.

[0053] When it is necessary to move the side support 21, tighten the fastening nut 89 to one end of the screw 88, and then pull the connecting bar 87 to move the two splined shafts 82 in the slot 8, so that the stop gear 84 engages with the annular sleeve 83 of the splined shaft 82. Since there is no external tooth of the splined shaft 82 for circumferential restriction, the slide block 85 will rotate with the movement of the slide block 85 through the stop gear 84 when it moves in the guide groove 4. After the height of the unloading block is adjusted, insert the splined shaft 82 to the deepest part of the slot 8. The part of the splined shaft 82 with external teeth engages with the stop gear 84 to circumferentially restrict the stop gear 84. The slot 8 circumferentially restricts the splined shaft 82, thereby preventing the two side supports 21 from sliding down due to the load and improving the safety of the unloading block.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A prefabricated precision-cast unloading block, comprising an upper support (1), a lower support (2), and a side support (21), characterized in that: The upper surface of the upper support (1) and the lower surface of the lower support (2) are both fixedly connected with protective pads (3). The upper support (1) and the lower support (2) are both provided with guide grooves (4) with T-shaped inner walls. An integrated box (5) is provided between the upper support (1) and the lower support (2). The inner wall of the integrated box (5) is respectively equipped with a driving device and a transmission device. The inner wall of the lower support (2) is equipped with a stop device. The drive device is used to control the operation of the transmission device, and the drive device includes a geared motor (6). The transmission device is used to control the upper support (1), the lower support (2) and the two side supports (21) to move in all directions respectively. The transmission device includes two sets of lifting mechanisms arranged symmetrically in front and behind and two sets of moving mechanisms arranged symmetrically in the left and right. The stop device prevents the distance between the upper support (1) and the lower support (2) from changing after the distance between the upper support (1) and the lower support (2) is adjusted. The inner bottom wall of the integrated box (5) is provided with an installation port for installing the geared motor (6). The geared motor (6) is equipped with a drive shaft (61) through the gearbox. Both ends of the drive shaft (61) are fixedly sleeved with transmission gears (62) and active bevel gears (63). The moving mechanism includes a connection port (75) and a limiting slide groove (76) opened on the inner walls of both sides of the integrated box (5). The inner wall of the limiting slide groove (76) is slidably inserted with a push frame (77) in an L-shape. The transverse surface of the push frame (77) is provided with a meshing groove (78). The two vertically distributed push frames (77) mesh with the transmission gear (62) at the meshing groove (78). The end surfaces of the two push frames (77) away from the integrated box (5) are fixedly connected to the side surfaces of the two side supports (21). The stop device includes slots (8) opened in the inner walls of the upper support (1) and the lower support (2). The inner wall of the guide slide (4) is provided with a rotating cavity (81). The inner wall of the slot (8) is movably inserted with a spline shaft (82). The outer surface of the spline shaft (82) is provided with two annular sleeves (83). The inner wall of the rotating cavity (81) is sleeved with a stop gear (84) that is movably inserted with the outer surface of the spline shaft (82). The upper and lower surfaces of the two side supports (21) are fixedly connected with slide rail seats (85) that slide into the inner wall of the guide groove (4). A stop groove (86) is opened on the side surface of the slide rail seat (85) away from the side support (21). The stop gear (84) meshes with the stop groove (86) for transmission. A mating bar (87) is fixedly connected to one end surface of the two spline shafts (82). A screw (88) is fixedly connected to one end surface of the lower support (2). The outer surface of the screw (88) is movably sleeved with the middle inner wall of the mating bar (87). A fastening nut (89) is threadedly connected to the outer surface of the screw (88).

2. The assembled precision-cast unloading block according to claim 1, characterized in that: The lifting mechanism includes two transmission rods (7) arranged symmetrically at the top and bottom, and driven bevel gears (71) are fixedly sleeved on the opposite surfaces of the two transmission rods (7). The two driven bevel gears (71) mesh with the driving bevel gear (63) for transmission. The upper surface of the integrated box (5) has two symmetrically arranged sleeve interfaces (72) that extend to its lower surface. The transmission rods (7) are installed in the sleeve interfaces (72) by bearings. Threaded grooves are opened on the outer surfaces of both ends of the transmission rods (7).

3. The assembled precision-cast unloading block according to claim 2, characterized in that: The upper support (1) and the lower support (2) are provided with placement openings (73) on their opposite surfaces. One end of the placement opening (73) has an inner wall with a receiving cavity that is movably sleeved with the outer surface of the transmission rod (7). The inner wall of the placement opening (73) is fitted with a rotating disk (74) that is threadedly sleeved with the outer surface of the transmission rod (7).

4. The assembled precision-cast unloading block according to claim 3, characterized in that: The vertical surface of the push frame (77) is fixedly connected with a plug rod (79), the outer surface of the plug rod (79) is movably inserted into the inner wall of the connection port (75), and one end surface of the push frame (77) is provided with a plug (710) that is movably sleeved with the outer surface of the plug rod (79) installed on another push frame (77).

Images