Double-sealing anti-explosion cable stuffing box

Abstract

The invention relates to the technical field of cable stuffing boxes, in particular to a double-seal explosion-proof cable stuffing box which comprises a first mounting head and a second mounting head, the first mounting head is connected with a fixing seat, and the first mounting head is used for being mounted in the fixing seat to further mount and fix the cable stuffing box. According to the double-sealing anti-explosion cable stuffing box, when a cable penetrates through the cable stuffing box, due to the arrangement of the sealing assembly, the driving assembly and other structures, the two sealing pieces can be made to get close to the middle to clamp the cable by rotating the outer sleeve, and due to the fact that the binding faces of the sealing pieces and the cable are flexible anti-explosion layers, the cable can be prevented from being damaged. The cable stuffing box is arranged, the size of the cable can be automatically adapted, then the adaptability and sealing performance of the device are improved, the end sealing assembly is arranged, the sealing performance between the cable and the outer end of the cable stuffing box can be improved, the driving assembly can be positioned, and the sealing performance and stability of the device are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of cable glands, and specifically relates to a double-sealed explosion-proof cable gland. Background Art

[0002] A cable is a device used for transmitting electricity. It consists of one or more insulated wires and usually also includes a sheath or other covering layer for protecting the wires. Cables are one of the most common devices in production and manufacturing. For example, a large number of cables are laid in the sites of the automotive industry and the power electronics component manufacturing industry. Cable glands are required when laying cables. A cable gland is a part used for filling and protecting cables during the cable laying process. When a cable passes through a wall, floor or other obstacles, a cable gland is usually provided to fix the cable and ensure that the cable is not damaged. At the same time, it is also used to seal the gap of the penetrated structure to prevent fire, water, gas or small animals from passing through.

[0003] The structures and functions of existing cable glands are relatively simple, and most of them can only achieve a single installation and fixation effect. Moreover, there are many types of cables, resulting in different diameters of cables. Also, the size of the same cable will change slightly when the temperature difference is large. This reduces the applicability and sealing performance of existing cable glands. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-sealed explosion-proof cable gland to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A double-sealed explosion-proof cable gland, including a first mounting head and a second mounting head. The first mounting head is connected to a fixed seat, and the first mounting head is used to be installed in the fixed seat to install and fix the cable gland. A central column is arranged between the first mounting head and the second mounting head. A sealing component is arranged inside the central column, and the sealing component is used to increase the sealing performance between the cable gland and the internal cable. A driving component is arranged outside the central column, and the driving component is used to fixedly install the first mounting head in the fixed seat and make the sealing component achieve a sealing effect. The second mounting head is connected to an end sealing component, and the end sealing component is used to increase the sealing performance between the cable and the outer end of the cable gland and position the driving component.

[0006] Preferably, the sealing assembly includes two movable blocks. An activity cavity is arranged inside the central column. The two movable blocks are symmetrically arranged up and down and movably arranged in the activity cavity inside the central column. The movable blocks are in close fit with the inner wall of the activity cavity, and the connection part has good sealing performance. Two threaded sleeves are arranged on the top surface of the movable block. A seal is installed inside the movable block. A wire groove is arranged in the middle of the opposite surfaces of the two seals. The two seals are used to clamp the cable at the wire groove to increase the sealing performance between the cable and the cable stuffing box.

[0007] Preferably, the seal is embedded in the movable block. An installation groove is arranged in the movable block. A number of side holes are arranged on the inner side wall of the installation groove. A number of positioning convex tubes are arranged on both sides of the seal. The positioning convex tubes correspond to the side holes one by one and are inserted into the side holes. The positioning convex tubes are connected with compression air bags. A top spring is arranged between the end of the compression air bag and the inner end surface of the side hole.

[0008] Preferably, the inside of the seal is a hollow air chamber and is connected with the compression air bag. The bottom surface of the seal is a flexible explosion-proof layer. The explosion-proof layer is made of heat-insulating, flame-retardant and soft materials. When the upper and lower seals approach and clamp the cable in the middle, due to the flexible structure of the bottom surface of the seal, the seal will automatically deform into a shape that fits the size of the cable. Since the bottom surface of the seal is squeezed, air enters the compression air bag. At the same time, the top spring pushes the compression air bag towards the middle, which can make the seal fit tightly with the surface of the cable, thereby increasing the sealing performance between the cable and the stuffing box.

[0009] Preferably, the driving assembly includes an outer sleeve. Two mounting bearings are installed on the inner wall of the outer sleeve. A fixing plate is arranged on the inner ring of the mounting bearing. The fixing plate is fixedly installed on the side wall of the central column. An internal gear ring is arranged between the two mounting bearings; The driving assembly further includes a rotating shaft rotatably installed between the end faces of the first mounting head and the second mounting head. A first gear is arranged in the middle of the rotating shaft. The first gear is meshed with the internal gear ring. One end of the rotating shaft is inserted into the first mounting head and a second gear is arranged at this end. Two movable frames are movably arranged inside the first mounting head. One end of the movable frame passes through the side wall of the first mounting head and corresponds to the positioning groove in the inner side wall of the fixed seat. A rack is arranged on the movable frame. The rack is meshed with the second gear. Therefore, when installing the stuffing box, insert the first mounting head into the fixed seat, rotate the outer sleeve so that the internal gear ring drives the rotating shaft to rotate, and then the second gear drives the movable frame to move. The two movable frames are rotationally symmetric about the center of the second gear, which can make the two movable frames move in opposite directions and their ends are inserted into the positioning groove, so that the first mounting head can be fixed in the fixed seat; A side rod is arranged in the middle of the movable frame. The end of the side rod is connected with a push plate. A storage airbag is arranged inside the first mounting head. The push plate abuts against the movable end of the storage airbag. A sealing airbag is embedded and installed on the inner side wall of the central through hole of the first mounting head. One end of the storage airbag is connected with the sealing airbag through an air delivery pipe. When the movable frame moves towards both ends, the push plate moves accordingly and squeezes the storage airbag, thereby causing the sealing airbag to expand. The sealing airbag tightly wraps the cable passing through it, which can increase the sealing performance between the inner end of the stuffing box and the cable.

[0010] Preferably, two second connecting gears are arranged on the rotating shaft. Two groups of rotating columns (installed through sealed bearings) are rotatably installed on the surface of the central column. A thread is provided on the side wall of one end of the rotating column and is inserted into the threaded sleeve. The other end of the rotating column is provided with a first connecting gear. The first connecting gear is meshed and connected with the second connecting gear. When the outer sleeve is rotated, the inner gear ring drives the rotating shaft and the second connecting gear to rotate, and then drives the first connecting gear and the rotating column to rotate, so that the threaded sleeve can drive the movable block to move up and down. Therefore, only by rotating the outer sleeve can the two sealing members approach each other in the middle, and then tightly wrap the middle cable, so that the sealing members can achieve a sealing effect.

[0011] Preferably, a plurality of positioning holes are provided on the end face of the outer sleeve. The end sealing assembly includes an end plate. A plurality of tension springs are connected between the end plate and the second mounting head. A protective sleeve is arranged in the middle of the end plate. The preparation material of the protective sleeve can be deformed and can play a role in flame retardancy and heat insulation. Since the protective sleeve can be deformed and its diameter is smaller than that of the cable, when the cable passes through the protective sleeve, it will expand the protective sleeve, and the protective sleeve tightly wraps the cable. The protective sleeve is used for sleeving on the cable to play a protective role. A plurality of positioning columns are installed on the side wall of the end plate. The positioning columns pass through the second mounting head movably and are correspondingly inserted into the positioning holes. When the outer sleeve needs to be rotated, the end plate needs to be pulled outwards so that the positioning columns are pulled out of the positioning holes before rotation can be carried out. After the front-end operation is completed, the tension springs pull the end plate back so that the positioning columns are correspondingly inserted into the positioning holes (because the sealing member is a flexible and deformable structure, so even after installation, the outer sleeve still has a certain space for rotational adjustment, so that the corresponding positioning holes and positioning columns are aligned), and then the outer sleeve can be positioned to prevent the outer sleeve from rotating randomly. At the same time, since both ends of the protective sleeve are closed structures, the left end of the protective sleeve is tightly inserted into the connection between the right end of the sealing member and the cable, which further increases the sealing performance of the end.

[0012] Compared with the prior art, the beneficial effects of the present invention are: A double-sealed explosion-proof cable gland proposed by the present invention, when a cable passes through the cable gland, due to the setting of structures such as a sealing component and a driving component, by rotating the outer sleeve, the two sealing members can be made to approach each other in the middle to clamp the cable. Since the fitting surface between the sealing member and the cable is a flexible explosion-proof layer, it can automatically adapt to the size of the cable, thereby increasing the adaptability and sealing performance of the device. And an end sealing component is provided, which can increase the sealing performance between the cable and the outer end of the cable gland and position the driving component, further improving the sealing performance and stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of the device of the present invention.

[0014] Figure 2 It is another perspective view of the device of the present invention.

[0015] Figure 3 It is a schematic structural diagram of the fixing seat of the present invention.

[0016] Figure 4 It is a schematic structural diagram of the interior of the outer sleeve of the present invention.

[0017] Figure 5 It is a connection structure diagram of the sealing component and the driving component of the present invention.

[0018] Figure 6 It is a schematic structural diagram of the outer sleeve of the present invention.

[0019] Figure 7 is Figure 5 a partial structural schematic diagram in

[0020] Figure 8 It is a connection structure diagram of the rotating shaft of the present invention.

[0021] Figure 9 It is a schematic structural diagram of the movable block of the present invention.

[0022] Figure 10 It is a schematic structural diagram of the sealing member of the present invention.

[0023] Figure 11 It is a schematic structural diagram of the outer end of the second mounting head of the present invention.

[0024] Figure 12 It is a connection structure diagram of the end plate 22 of the present invention.

[0025] In the figure: the first mounting head 1, the second mounting head 2, the central column 3, the movable block 4, the seal 5, the positioning convex tube 501, the compression airbag 502, the pressing spring 503, the threaded sleeve 6, the rotating column 7, the first connecting gear 8, the rotating shaft 9, the second connecting gear 10, the outer sleeve 11, the mounting bearing 1101, the fixing plate 1102, the internal gear ring 1103, the positioning hole 1104, the first gear 12, the second gear 13, the movable frame 14, the rack 15, the pushing plate 16, the storage airbag 17, the air delivery pipe 18, the sealing airbag 19, the fixing seat 20, the positioning groove 21, the end plate 22, the protective sleeve 23, the positioning column 24, the tension spring 25. Detailed implementation manner

[0026] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 to 12 , the present invention provides a technical solution: a double-sealed explosion-proof cable stuffing box, including a first mounting head 1 and a second mounting head 2. The first mounting head 1 is connected to a fixing seat 20, and the first mounting head 1 is used to be installed in the fixing seat 20 to install and fix the cable stuffing box.

[0028] A central column 3 is arranged between the first mounting head 1 and the second mounting head 2. A sealing component is arranged inside the central column 3, and the sealing component is used to increase the sealing performance between the cable stuffing box and the internal cable. A driving component is arranged outside the central column 3, and the driving component is used to fixedly install the first mounting head 1 in the fixing seat 20 and make the sealing component achieve a sealing effect.

[0029] The sealing assembly includes two movable blocks 4. An active cavity is provided inside the central column 3. The two movable blocks 4 are symmetrically arranged up and down and movably arranged in the active cavity inside the central column 3. The movable block 4 is in close fit with the inner wall of the active cavity, and the connection part has good sealing performance. Two threaded sleeves 6 are arranged on the top surface of the movable block 4. A seal 5 is installed inside the movable block 4. A wire groove is arranged in the middle of the opposite surfaces of the two seals 5. The two seals 5 are used to clamp the cable at the wire groove to increase the sealing performance between the cable and the cable stuffing box. The seal 5 is embedded in the movable block 4. An installation groove is provided in the movable block 4. A plurality of side holes are provided on the inner side wall of the installation groove. A plurality of positioning convex tubes 501 are arranged on both sides of the seal 5 respectively. The positioning convex tubes 501 correspond to the side holes one by one and are inserted into the side holes. The positioning convex tube 501 is connected with a compression airbag 502. A top spring 503 is arranged between the end of the compression airbag 502 and the inner end surface of the side hole. The inside of the seal 5 is a hollow air chamber and is communicated with the compression airbag 502. The bottom surface of the seal 5 is a flexible explosion-proof layer. The explosion-proof layer is made of heat-insulating, flame-retardant and soft materials. When the upper and lower seals 5 approach and clamp the cable in the middle, due to the flexible structure of the bottom surface of the seal 5, the seal 5 will automatically deform into a shape that fits the size of the cable. Since the bottom surface of the seal 5 is squeezed, air enters the compression airbag 502. At the same time, the top spring 503 pushes the compression airbag 502 towards the middle, which can make the seal 5 fit tightly with the surface of the cable, thereby increasing the sealing performance between the cable and the stuffing box.

[0030] The driving assembly includes an outer sleeve 11. Two mounting bearings 1101 are installed on the inner wall of the outer sleeve 11. A fixing plate 1102 is arranged on the inner ring of the mounting bearing 1101. The fixing plate 1102 is fixedly installed on the side wall of the central column 3. An internal gear ring 1103 is arranged between the two mounting bearings 1101. The driving assembly further includes a rotating shaft 9 rotatably installed between the end faces of the first mounting head 1 and the second mounting head 2. A first gear 12 is arranged in the middle of the rotating shaft 9. The first gear 12 is meshed and connected with the internal gear ring 1103. One end of the rotating shaft 9 is inserted into the first mounting head 1 and a second gear 13 is arranged on this end. Two movable frames 14 are movably arranged inside the first mounting head 1. One end of the movable frame 14 passes through the side wall of the first mounting head 1 and corresponds to the positioning groove 21 on the inner side wall of the fixed seat 20. A rack 15 is arranged on the movable frame 14. The rack 15 is meshed and connected with the second gear 13. Therefore, when installing the stuffing box, the first mounting head 1 is inserted into the fixed seat 20. The outer sleeve 11 is rotated to make the internal gear ring 1103 drive the rotating shaft 9 to rotate, and then the second gear 13 drives the movable frame 14 to move. The two movable frames 14 are rotationally symmetric about the center of the second gear 13, so that the two movable frames 14 move in opposite directions and their ends are inserted into the positioning groove 21, and the first mounting head 1 can be fixed in the fixed seat 20. A side rod is arranged in the middle of the movable frame 14. The end of the side rod is connected with a push plate 16. A storage airbag 17 is arranged inside the first mounting head 1. The push plate 16 abuts against the movable end of the storage airbag 17. A sealing airbag 19 is embedded and installed on the inner side wall of the central through hole of the first mounting head 1. One end of the storage airbag 17 and the sealing airbag 19 are connected through an air pipe 18. When the movable frame 14 moves towards both ends, the push plate 16 moves accordingly and squeezes the storage airbag 17, thereby making the sealing airbag 19 expand. The sealing airbag 19 tightly wraps the cable passing through it, which can increase the sealing performance between the inner end of the stuffing box and the cable.

[0031] Two second connecting gears 10 are arranged on the rotating shaft 9. Two groups of rotating columns 7 (installed through sealed bearings) are rotatably installed on the surface of the central column 3. A thread is provided on the side wall of one end of the rotating column 7 and is inserted into the threaded sleeve 6. A first connecting gear 8 is arranged at the other end of the rotating column 7. The first connecting gear 8 is meshed and connected with the second connecting gear 10. When the outer sleeve 11 is rotated, the internal gear ring 1103 drives the rotating shaft 9 and the second connecting gear 10 to rotate, and then drives the first connecting gear 8 and the rotating column 7 to rotate, so that the threaded sleeve 6 drives the movable block 4 to move up and down. Therefore, only by rotating the outer sleeve 11 can the two sealing members 5 move closer to each other, and then tightly wrap the middle cable, so that the sealing members 5 can achieve the sealing effect.

[0032] The second mounting head 2 is connected with an end sealing assembly, which is used to increase the sealing performance between the cable and the outer end of the cable gland and position the driving assembly. A plurality of positioning holes 1104 are formed in the end face of the outer sleeve 11. The end sealing assembly includes an end plate 22. A plurality of tension springs 25 are connected between the end plate 22 and the second mounting head 2. A protective sleeve 23 is arranged in the middle of the end plate 22. The material for preparing the protective sleeve 23 can be deformed and can play a role in flame retardancy and heat insulation. Since the protective sleeve 23 can be deformed, the diameter of the protective sleeve 23 is smaller than that of the cable. When the cable passes through the protective sleeve 23, the protective sleeve 23 will be expanded. The protective sleeve 23 tightly wraps around the cable. The protective sleeve 23 is used for sleeving on the cable to play a protective role. A plurality of positioning columns 24 are installed on the side wall of the end plate 22. The positioning columns 24 pass through the second mounting head 2 movably and are correspondingly inserted into the positioning holes 1104. When it is necessary to rotate the outer sleeve 11, it is necessary to pull the end plate 22 outwards so that the positioning columns 24 are pulled out of the positioning holes 1104 before rotation can be carried out. After the current front-end operation is completed, the tension springs 25 pull the end plate 22 back so that the positioning columns 24 are correspondingly inserted into the positioning holes 1104 (because the sealing member 5 is a flexible and deformable structure, so even after installation, the outer sleeve 11 still has a certain rotation adjustment space, so that the positioning holes 1104 and the positioning columns 24 at the corresponding positions are aligned), and then the outer sleeve 11 can be positioned to prevent the outer sleeve 11 from rotating randomly. At the same time, since both ends of the protective sleeve 23 are closed structures, the left end of the protective sleeve 23 is tightly inserted into the connection between the right end of the sealing member 5 and the cable, which further increases the sealing performance at the end.

[0033] During installation and use, first fixedly install the fixed seat 20 at the required position, then pass the cable through the stuffing box, insert the first mounting head 1 into the fixed seat 20, and rotate the outer sleeve 11 so that the internal gear ring 1103 drives the rotating shaft 9 to rotate. Further, the second gear 13 drives the movable frame 14 to move. The two movable frames 14 are rotationally symmetric about the center of the second gear 13, so that the two movable frames 14 move in opposite directions and their ends are inserted into the positioning slots 21, and then the first mounting head 1 can be fixed in the fixed seat 20. When the movable frames 14 move towards both ends, the push plate 16 moves accordingly and squeezes the storage airbag 17, thereby causing the sealing airbag 19 to expand. The sealing airbag 19 tightly wraps the cable passing through it, which can increase the sealing performance between the inner end of the stuffing box and the cable. And when rotating the outer sleeve 11, the internal gear ring 1103 drives the rotating shaft 9 and the second connecting gear 10 to rotate, and further drives the first connecting gear 8 and the rotating column 7 to rotate, so that the threaded sleeve 6 drives the movable block 4 to move up and down. Therefore, only by rotating the outer sleeve 11 can the two sealing members 5 move closer to the middle, and then tightly wrap the middle cable, so that the sealing members 5 play a sealing role. When it is necessary to rotate the outer sleeve 11, it is necessary to pull the end plate 22 outwards so that the positioning post 24 is pulled out of the positioning hole 1104 before rotation. After the front-end operation is completed, the tension spring 25 pulls the end plate 22 back so that the positioning post 24 is correspondingly inserted into the positioning hole 1104, and then the outer sleeve 11 can be positioned to prevent the outer sleeve 11 from rotating randomly. At the same time, since the two ends of the protective sleeve 23 are in a closed-mouth structure, the left end of the protective sleeve 23 is tightly inserted into the connection between the right end of the sealing member 5 and the cable, which further increases the sealing performance at the end.

[0034] A double-sealing explosion-proof cable stuffing box proposed by the present invention. When the cable passes through the cable stuffing box, due to the arrangement of structures such as a sealing component and a driving component, by rotating the outer sleeve 11, the two sealing members 5 can be made to move closer to the middle to clamp the cable. Since the fitting surface between the sealing member 5 and the cable is a flexible explosion-proof layer, it can automatically adapt to the size of the cable, thereby increasing the adaptability and sealing performance of the device. And an end sealing component is provided, which can increase the sealing performance between the cable and the outer end of the cable stuffing box and position the driving component, so that the sealing performance and stability of the device are further improved.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-sealed explosion-proof cable stuffing box, comprising a first mounting head and a second mounting head, characterized in that: The first mounting head is connected to a fixing seat, and the first mounting head is used to be installed in the fixing seat to thereby install and fix the cable stuffing box; A central column is provided between the first mounting head and the second mounting head, a sealing assembly is provided inside the central column, the sealing assembly is used to increase the sealing performance between the cable stuffing box and the internal cable, and a driving assembly is provided outside the central column, the driving assembly is used to fix the first mounting head in the fixing seat and enable the sealing assembly to play a sealing effect; The second mounting head is connected with an end sealing assembly, which is used to increase the sealing between the cable and the outer end of the cable stuffing box and to position the drive assembly.

2. A double-seal explosion-proof cable stuffing box according to claim 1, characterized in that: The sealing assembly includes two movable blocks, which are symmetrical in structure and movably arranged inside the center column. Two threaded sleeves are arranged on the top surface of the movable block, and a seal is installed inside the movable block. A wire groove is arranged in the middle of the opposite surfaces of the two seals. The two seals are used to clamp the cable in the wire groove to increase the sealing of the cable and the cable stuffing box.

3. A double-seal explosion-proof cable stuffing box according to claim 2, characterized in that: The seal is embedded in the movable block, a mounting groove is provided in the movable block, a plurality of side holes are provided on the inner side wall of the mounting groove, a plurality of positioning convex tubes are provided on both sides of the seal, the positioning convex tubes correspond to the side holes one by one and are inserted into the side holes, the positioning convex tubes are connected to a compression air bag, and a tightening spring is provided between the end of the compression air bag and the inner end surface of the side hole.

4. A double-seal explosion-proof cable stuffing box according to claim 2, characterized in that: The interior of the sealing member is a hollow air chamber which is communicated with the compressed air bag, and the bottom surface of the sealing member is a flexible explosion-proof layer.

5. The double-seal explosion-proof cable stuffing box according to claim 2, characterized in that: The driving assembly comprises an outer sleeve, on the inner wall of which two mounting bearings are mounted, on the inner ring of which a fixing plate is arranged, the fixing plate is fixedly mounted on the side wall of the center column, and between which an inner gear ring is arranged; The driving assembly also includes a rotating shaft rotatably mounted between the end faces of the first mounting head and the second mounting head, a first gear is arranged in the middle of the rotating shaft, the first gear is meshed with the inner gear ring, one end of the rotating shaft is inserted into the first mounting head and the second gear is arranged on the end, two movable frames are movably arranged inside the first mounting head, one end of the movable frame passes through the side wall of the first mounting head and corresponds to the positioning groove in the inner side wall of the fixed seat, and a rack is arranged on the movable frame, and the rack is meshed with the second gear; A side rod is arranged in the middle of the movable frame, and a push plate is connected to the end of the side rod. A storage air bag is arranged inside the first mounting head, and the push plate is against the movable end of the storage air bag. A sealing air bag is embedded in the inner wall of the central through hole of the first mounting head, and one end of the storage air bag is connected to the sealing air bag through an air pipe.

6. A double-seal explosion-proof cable stuffing box according to claim 5, characterized in that: Two second connecting gears are arranged on the rotating shaft, and two groups of rotating columns are rotatably installed on the surface of the central column. A thread is opened on the side wall of one end of the rotating column and is inserted into the threaded sleeve. A first connecting gear is arranged on the other end of the rotating column, and the first connecting gear and the second connecting gear are meshed and connected.

7. The double-seal explosion-proof cable stuffing box according to claim 5, characterized in that: A plurality of positioning holes are provided on the end surface of the outer sleeve, and the end sealing assembly includes an end plate, an array of tension springs are connected between the end plate and the second mounting head, a sheath tube is provided in the middle of the end plate, and a plurality of positioning columns are installed on the side wall of the end plate, and the positioning columns are movable through the second mounting head and are correspondingly plugged into the positioning holes.

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