Positioning device for logistics supply chain

Abstract

The invention belongs to the technical field of logistics equipment, and discloses a positioning device for a logistics supply chain, which is technically characterized by comprising a worktable, two groups of vertical plates are fixedly mounted on the surface of the worktable, a plurality of groups of bearing rollers which are distributed in parallel are rotatably mounted on two opposite side walls of the two groups of vertical plates respectively, and the surfaces of the plurality of groups of bearing rollers are jointly sleeved with a conveying belt; a plurality of sets of transverse columns distributed at equal intervals are fixedly installed on the surface of the conveying belt, a positioning mechanism is arranged on the surfaces of the transverse columns, and the positioning mechanism comprises a positioning plate, a supporting assembly and a telescopic assembly. The two sets of positioning plates on the two sides of the article can be controlled to move relatively, then the article can be automatically pushed to the middle position of the conveying belt, and the information input mechanism can accurately scan and input information of the article under the information input mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of logistics equipment, in particular to a positioning device for a logistics supply chain. Background Art

[0002] The logistics supply chain includes corporate logistics, non-profit organization logistics and household logistics. From the perspective of steps, supply chain materials can be divided into procurement, production and marketing. With the rapid development of the e-commerce industry, logistics companies need to classify and transport large quantities of express goods. During production and transportation, people need to use positioning devices to assist people in classifying and processing express items.

[0003] When express items are transported, it is necessary to use information entry equipment to scan the order number and other information on the surface of the item and enter it into the system. The information entry equipment is usually fixed directly above the conveyor belt, and the information entry equipment can only scan and process the area directly below. When the existing logistics conveying equipment transports items, the items fall scattered on the surface of the conveyor belt, and the items cannot be automatically placed in the middle of the conveyor belt. When the items are near the two sides of the conveyor belt, the information entry equipment cannot accurately scan the order number and other information on the surface of the item, and the use effect is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a positioning device for a logistics supply chain to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A positioning device for a logistics supply chain comprises a workbench, wherein support legs are respectively arranged around the bottom wall of the workbench, two sets of relatively distributed vertical plates are fixedly installed on the surface of the workbench, and multiple sets of parallel distributed bearing rollers are rotatably installed on the opposite side walls of the two sets of vertical plates, and gaps are provided between the relatively distributed bearing rollers on the surfaces of the two sets of vertical plates, and a conveyor belt is commonly sleeved on the surfaces of the multiple sets of bearing rollers, and multiple sets of horizontal columns distributed at equal intervals are fixedly installed on the surface of the conveyor belt, and an information input mechanism located above the conveyor belt is commonly fixedly installed in the middle of the two sets of vertical plates, and a driving mechanism that cooperates with the bearing rollers is arranged between the two sets of vertical plates. The driving assembly is used to control the rotation of the bearing roller and thus control the conveyor belt to rotate between the two groups of vertical plates. A positioning mechanism is arranged on the surface of the horizontal column. The positioning mechanism includes a positioning plate, a supporting assembly and a telescopic assembly. Two groups of positioning plates are arranged. The supporting assembly is located in the horizontal column and connected to the positioning plate. The supporting assembly is used to control the two groups of positioning plates to be located at both ends of the horizontal column respectively. The telescopic assembly is connected to the supporting assembly. When the conveyor belt drives the horizontal column to move between the two groups of vertical plates, the telescopic assembly controls the two groups of positioning plates to move relative to each other on the outside of the horizontal column by cooperating with the supporting assembly.

[0006] As a further solution of the present invention: the driving assembly includes a rotating shaft that is jointly rotatably installed with two groups of vertical plates, and the surfaces of the load-bearing rollers on the surfaces of the two groups of vertical plates close to the rotating shaft are respectively fixedly installed with gear rings, and the surface of the rotating shaft is fixedly installed with a transmission gear plate that is meshed with the gear rings, and one end of the rotating shaft extends to the outside of the vertical plate and is connected to a motor.

[0007] As a further solution of the present invention: the support assembly includes a telescopic cavity opened inside the transverse column, two groups of relatively distributed sliding blocks are slidably installed in the telescopic cavity, two groups of relatively distributed baffles are fixedly installed in the middle of the telescopic cavity, and an extrusion spring is fixedly installed on the side wall of the baffle facing the sliding block, the telescopic end of the extrusion spring is connected to the sliding block, and two groups of relatively distributed connecting grooves connected to the telescopic cavity are opened inwardly on the surface of the transverse column, a support rod is fixedly installed on the surface of the sliding block, and the end of the support rod away from the sliding block extends through the connecting groove to the outside of the transverse column and is fixedly connected to the positioning plate.

[0008] As a further solution of the present invention: the telescopic assembly includes a bottom hole which is opened upward from the center position of the bottom of the horizontal column and is connected to the telescopic cavity. A pulling rope is fixedly installed on the side wall of the sliding block facing the baffle. The end of the pulling rope away from the sliding block passes through the bottom hole and the conveyor belt and is fixedly installed with a control block. The control block is made of magnetic material. The two side walls opposite to each other of the two groups of vertical plates are respectively fixedly installed with first brackets. The two groups of first brackets extend to the inner cavity of the conveyor belt and are jointly fixed with a magnetic positioning block that cooperates with the control block.

[0009] As a further solution of the present invention: the side wall of the control block is provided with an auxiliary positioning part, and when the control block is separated from the magnetic positioning block, the auxiliary positioning part is used to limit the moving trajectory of the control block.

[0010] As a further solution of the present invention: the auxiliary positioning part includes auxiliary positioning blocks fixedly installed on two side walls opposite to the control block, the surface of the auxiliary positioning block is provided with a guide groove, and second brackets are fixedly installed on two side walls opposite to each other of the two groups of vertical plates, the second brackets extend into the inner cavity of the conveyor belt and are fixedly installed with guide rods that cooperate with the guide grooves.

[0011] As a further solution of the present invention: a protection wheel cooperating with the pulling rope is rotatably installed in the telescopic cavity.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: when the conveyor belt is conveying articles, the two sets of positioning plates on both sides of the articles can be controlled to move relative to each other by setting the supporting assembly and the telescopic assembly to cooperate with each other, so that the articles can be automatically pushed to the middle of the conveyor belt, and the information input mechanism can accurately scan and input the information of the articles directly below. This solves the problem that the information input device cannot accurately scan the order number and other information on the surface of the articles when the articles are scattered on the conveyor belt surface and the articles are close to the two sides of the conveyor belt, resulting in poor use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0014] Figure 2 It is a schematic diagram of the main structure of a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0015] Figure 3 It is a schematic diagram of a bearing roller and its connection structure in a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0016] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of A.

[0017] Figure 5 for Figure 3 Schematic diagram of the enlarged structure of B.

[0018] Figure 6 This is a schematic diagram of a horizontal column and its connection structure in a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0019] Figure 7 The present invention is a schematic diagram of a control block and its connection structure in a positioning device for a logistics supply chain provided in an embodiment of the present invention.

[0020] Among them: 1-workbench, 2-vertical plate, 3-bearing roller, 4-conveyor belt, 5-driving assembly, 51-tooth ring, 52-rotating shaft, 53-transmission gear disc, 54-motor, 6-horizontal column, 7-positioning mechanism, 71-positioning plate, 72-support assembly, 721-telescopic cavity, 722-baffle, 723-connecting groove, 724-sliding block, 725-support rod, 726-extrusion spring, 73-telescopic assembly, 731-bottom hole, 732-pulling rope, 733-control block, 734-first bracket, 735-magnetic positioning block, 8-information entry mechanism, 9-auxiliary positioning part, 91-auxiliary positioning block, 92-guide groove, 93-second bracket, 94-guide rod, 10-protection wheel. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0022] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0023] like Figure 1 , Figure 2 , Figure 3 As shown, it is a structural diagram of a positioning device for a logistics supply chain provided by an embodiment of the present invention, comprising a workbench 1, wherein support legs are respectively arranged around the bottom wall of the workbench 1, two sets of relatively distributed vertical plates 2 are fixedly installed on the surface of the workbench 1, and multiple sets of parallel distributed bearing rollers 3 are rotatably installed on the opposite side walls of the two sets of vertical plates 2, and there are gaps between the relatively distributed bearing rollers 3 on the surfaces of the two sets of vertical plates 2, and a conveyor belt 4 is commonly sleeved on the surfaces of the multiple sets of bearing rollers 3, and multiple sets of equally spaced horizontal columns 6 are fixedly installed on the surface of the conveyor belt 4, an information entry mechanism 8 located above the conveyor belt 4 is commonly fixedly installed in the middle of the two sets of vertical plates 2, and a driving group 3 that cooperates with the bearing rollers 3 is arranged between the two sets of vertical plates 2. Part 5, the driving component 5 is used to control the rotation of the bearing roller 3 and thus control the conveyor belt 4 to rotate between the two groups of vertical plates 2. A positioning mechanism 7 is provided on the surface of the horizontal column 6. The positioning mechanism 7 includes a positioning plate 71, a support component 72 and a telescopic component 73. Two groups of positioning plates 71 are provided. The support component 72 is located in the horizontal column 6 and is connected to the positioning plates 71. The support component 72 is used to control the two groups of positioning plates 71 to be located at both ends of the horizontal column 6 respectively. The telescopic component 73 is connected to the support component 72. When the conveyor belt 4 drives the horizontal column 6 to move between the two groups of vertical plates 2, the telescopic component 73 controls the two groups of positioning plates 71 to move relative to each other on the outside of the horizontal column 6 by cooperating with the support component 72.

[0024] When in use, the driving assembly 5 drives a group of bearing rollers 3 on the surfaces of the two groups of vertical plates 2 to rotate synchronously. The multiple groups of bearing rollers 3 cooperate with each other to drive the conveyor belt 4 to rotate between the two groups of vertical plates 2, and the objects are placed on the surface of the conveyor belt 4 in turn. The conveyor belt 4 drives the objects to move synchronously. When the objects on the surface of the conveyor belt 4 move below the information entry mechanism 8, the information entry mechanism 8 can scan the order number and other information on the surface of the objects and enter them into the system. Initially, the support assembly 72 controls the positions of the two groups of positioning plates 71, and the two groups of positioning plates 71 are respectively located at the two ends of the horizontal column 6. When the objects are placed on the conveyor belt 4, the support assembly 72 controls the positions of the two groups of positioning plates 71, and the two groups of positioning plates 71 are respectively located at the two ends of the horizontal column 6. When conveying, the items are placed on the surface of the conveyor belt 4 and between the two sets of positioning plates 71. The conveyor belt 4 drives the horizontal column 6 and the items to move synchronously. When the horizontal column 6 and the items move, the telescopic assembly 73 and the support assembly 72 cooperate with each other to control the two sets of positioning plates 71 to move relative to each other on the outside of the horizontal column 6. The two sets of positioning plates 71 can automatically push the items on the surface of the conveyor belt 4 to the middle of the conveyor belt 4. The conveyor belt 4 drives the items to move continuously. The items pass through the information input mechanism 8 in turn. The information input mechanism 8 can accurately input the order number and other information on the surface of the items. After pushing the items to the middle of the conveyor belt 4, the conveyor belt 4 drives the items to move continuously. The support assembly 72 controls the two sets of positioning plates 71 to move in the opposite direction to the two ends of the horizontal column 6.

[0025] like Figure 1 , Figure 2 , Figure 3 As shown, as a preferred embodiment of the present invention, the driving assembly 5 includes a rotating shaft 52 that is jointly rotatably mounted on two groups of vertical plates 2, and the surfaces of the bearing rollers 3 of the two groups of vertical plates 2 close to the rotating shaft 52 are respectively fixedly mounted with gear rings 51, and the surface of the rotating shaft 52 is fixedly mounted with a transmission gear plate 53 that is meshed with the gear ring 51, and one end of the rotating shaft 52 extends to the outside of the vertical plate 2 and is connected to a motor 54.

[0026] When in use, the motor 54 drives the rotating shaft 52 to rotate and then drives the transmission gear plate 53 to rotate. The transmission gear plate 53 engages with the gear ring 51 for transmission, and then can drive a group of bearing rollers 3 on the surfaces of the two groups of vertical plates 2 to rotate synchronously. Multiple groups of bearing rollers 3 cooperate with each other to drive the conveyor belt 4 to rotate between the vertical plates 2.

[0027] like Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7As shown, as a preferred embodiment of the present invention, the support assembly 72 includes a telescopic cavity 721 opened inside the cross column 6, and two groups of relatively distributed sliding blocks 724 are slidably installed in the telescopic cavity 721, and two groups of relatively distributed baffles 722 are fixedly installed in the middle of the telescopic cavity 721, and a squeezing spring 726 is fixedly installed on the side wall of the baffle 722 facing the sliding block 724, and the telescopic end of the squeezing spring 726 is connected to the sliding block 724, and two groups of relatively distributed connecting grooves 723 connected to the telescopic cavity are opened inwardly on the surface of the cross column 6, and a support rod 725 is fixedly installed on the surface of the sliding block 724, and the end of the support rod 725 away from the sliding block 724 extends to the outside of the cross column 6 through the connecting groove 723 and is fixedly connected to the positioning plate 71.

[0028] When the object is in the middle of the conveyor belt 4, the conveyor belt 4 drives the object to move continuously, and the telescopic component 73 releases the pulling force on the sliding block 724, and the squeezing spring 726 pushes the two sets of sliding blocks 724 to move in the opposite direction to the two ends of the telescopic cavity 721. At this time, the two sets of positioning plates 71 move synchronously to the two ends of the cross column 6.

[0029] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, as a preferred embodiment of the present invention, the telescopic component 73 includes a bottom hole 731 which is opened upward from the center position of the bottom of the horizontal column 6 and communicates with the telescopic cavity 721. A pulling rope 732 is fixedly installed on the side wall of the sliding block 724 facing the baffle 722. The end of the pulling rope 732 away from the sliding block 724 passes through the bottom hole 731 and the conveyor belt 4 and is fixedly installed with a control block 733. The control block 733 is made of magnetic material. The two side walls opposite to each other of the two groups of vertical plates 2 are respectively fixedly installed with first brackets 734. The two groups of first brackets 734 extend to the inner cavity of the conveyor belt 4 and are jointly fixedly installed with a magnetic positioning block 735 that cooperates with the control block 733.

[0030] When the conveyor belt 4 drives the cross column 6 to move, the cross column 6 drives the control block 733 to move synchronously. When the control block 733 moves to above the magnetic positioning block 735, the magnetic positioning block 735 is connected to the control block 733 as a whole through magnetic attraction. The conveyor belt 4 drives the cross column 6 to continue to move. At this time, the control block 733 is still fixed on the surface of the magnetic positioning block 735. The control block 733 cooperates with the pulling rope 732 to pull the two groups of sliding blocks 724 to move relative to each other in the telescopic cavity 721. At this time, the two groups of positioning plates 71 can push the objects to the middle position of the conveyor belt 4, and the cross column 6 continues to move. When the sliding block 724 moves to the extreme position in the telescopic cavity 721, the control block 733 separates from the magnetic positioning block 735, and the control block 733 moves to below the bottom hole 731.

[0031] like Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 As shown, as a preferred embodiment of the present invention, the side wall of the control block 733 is provided with an auxiliary positioning portion 9, and when the control block 733 is separated from the magnetic positioning block 735, the auxiliary positioning portion 9 is used to limit the moving trajectory of the control block 733.

[0032] After the control block 733 is separated from the magnetic positioning block 735 , when the control block 733 moves toward the bottom hole 731 , the auxiliary positioning part 9 can limit the moving trajectory of the control block 733 to prevent the control block 733 from moving randomly in the inner cavity of the conveyor belt 4 .

[0033] like Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 As shown, as a preferred embodiment of the present invention, the auxiliary positioning portion 9 includes auxiliary positioning blocks 91 fixedly installed on two side walls opposite to the control block 733, and a guide groove 92 is opened on the surface of the auxiliary positioning block 91. Second brackets 93 are fixedly installed on the two side walls opposite to each other of the two groups of vertical plates 2, and the second brackets 93 extend to the inner cavity of the conveyor belt 4 and are fixedly installed with guide rods 94 that cooperate with the guide grooves 92.

[0034] The conveyor belt 4 drives the cross column 6 and the control block 733 to move. When the control block 733 moves to above the magnetic positioning block 735, the magnetic positioning block 735 is connected to the control block 733 as a whole through magnetic attraction. At this time, the auxiliary positioning blocks 91 on both sides of the control block 733 are inserted to the outside of the guide rod 94 through the guide groove 92. When the sliding block 724 moves to the extreme position in the telescopic cavity 721, the control block 733 is separated from the magnetic positioning block 735, and the control block 733 can move along the surface of the guide rod 94, which can effectively improve the stability of the control block 733.

[0035] like Figure 6 As shown in FIG. 1 , as a preferred embodiment of the present invention, a protection wheel 10 that cooperates with the pulling rope 732 is rotatably installed in the telescopic cavity 721 . The protection wheel 10 can effectively reduce the wear of the pulling rope 732 .

[0036] The working principle of the present invention is: when in use, the motor 54 drives the rotating shaft 52 to rotate and then drives the transmission gear plate 53 to rotate, the transmission gear plate 53 and the gear ring 51 are meshed and transmitted, and then a group of bearing rollers 3 on the surface of the two groups of vertical plates 2 can be driven to rotate synchronously, and multiple groups of bearing rollers 3 cooperate with each other to drive the conveyor belt 4 to rotate between the vertical plates 2. Articles are placed on the surface of the conveyor belt 4 in sequence, and the conveyor belt 4 drives the articles to move synchronously. When the articles on the surface of the conveyor belt 4 move to the bottom of the information entry mechanism 8, the information entry mechanism 8 can scan the order number and other information on the surface of the articles and enter them into the system. Initially, the two groups of positioning plates 71 are respectively located at both ends of the horizontal column 6.

[0037] When conveying articles, the articles are placed on the surface of the conveyor belt 4 and between the two sets of positioning plates 71. The conveyor belt 4 drives the cross column 6 and the articles to move synchronously, and the cross column 6 drives the control block 733 to move synchronously. When the control block 733 moves above the magnetic positioning block 735, the magnetic positioning block 735 is connected to the control block 733 as a whole through magnetic attraction. The conveyor belt 4 drives the cross column 6 to move continuously. At this time, the control block 733 is still fixed on the surface of the magnetic positioning block 735, and the control block 733 cooperates with the pulling rope 732. The two sets of sliding blocks 724 can be pulled to move relative to each other in the telescopic cavity 721. The sliding blocks 724 cooperate with the support rods 725, thereby driving the two sets of positioning plates 71 to move relative to each other synchronously on the outside of the horizontal column 6. The two sets of positioning plates 71 can automatically push the items on the surface of the conveyor belt 4 to the middle position of the conveyor belt 4. After pushing the items to the middle position of the conveyor belt 4, the conveyor belt 4 drives the items to continue to move. The items pass through the information input mechanism 8 in turn. The information input mechanism 8 can accurately input the order number and other information on the surface of the items. The horizontal column 6 continues to move. When the sliding block 724 moves to the extreme position in the telescopic cavity 721, the control block 733 separates from the magnetic positioning block 735, and the extrusion spring 726 pushes the two sets of sliding blocks 724 to move in the opposite direction to the two ends of the telescopic cavity 721 again. At this time, the two sets of positioning plates 71 move synchronously to the two ends of the horizontal column 6.

[0038] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A positioning device for a logistics supply chain, comprising a workbench, the bottom wall of which is respectively provided with supporting legs, and the surface of which is fixedly provided with two sets of vertical plates which are relatively distributed, characterized in that: Multiple groups of parallel distributed bearing rollers are rotatably installed on the two opposite side walls of the two groups of vertical plates, and there are gaps between the bearing rollers that are relatively distributed on the surfaces of the two groups of vertical plates. Conveyor belts are commonly sleeved on the surfaces of the multiple groups of bearing rollers, and multiple groups of horizontal columns with equal spacing are fixedly installed on the surface of the conveyor belt. An information input mechanism located above the conveyor belt is commonly fixedly installed in the middle of the two groups of vertical plates; A driving assembly that cooperates with the bearing roller is arranged between the two sets of vertical plates, and the driving assembly is used to control the bearing roller to rotate and thus control the conveyor belt to rotate between the two sets of vertical plates; The surface of the horizontal column is provided with a positioning mechanism, which includes a positioning plate, a support assembly and a telescopic assembly. Two groups of positioning plates are provided. The support assembly is located in the horizontal column and connected to the positioning plates. The support assembly is used to control the two groups of positioning plates to be located at both ends of the horizontal column respectively. The telescopic assembly is connected to the supporting assembly. When the conveyor belt drives the horizontal column to move between the two groups of vertical plates, the telescopic assembly controls the two groups of positioning plates to move relative to each other on the outside of the horizontal column by cooperating with the supporting assembly.

2. A positioning device for logistics supply chain according to claim 1, characterized in that: The driving assembly includes a rotating shaft that is mounted to rotate together with two sets of vertical plates. The surfaces of the two sets of vertical plates and the bearing rollers close to the rotating shaft are respectively fixedly mounted with gear rings. The surface of the rotating shaft is fixedly mounted with a transmission gear plate that is meshed with the gear rings. One end of the rotating shaft extends to the outside of the vertical plate and is connected to a motor.

3. A positioning device for logistics supply chain according to claim 1, characterized in that: The support assembly includes a telescopic cavity opened inside a transverse column, two groups of relatively distributed sliding blocks are slidably installed in the telescopic cavity, two groups of relatively distributed baffles are fixedly installed in the middle of the telescopic cavity, an extrusion spring is fixedly installed on one side wall of the baffle facing the sliding block, the telescopic end of the extrusion spring is connected to the sliding block, two groups of relatively distributed connecting grooves connected to the telescopic cavity are opened inwardly on the surface of the transverse column, a support rod is fixedly installed on the surface of the sliding block, and one end of the support rod away from the sliding block extends through the connecting groove to the outside of the transverse column and is fixedly connected to the positioning plate.

4. A positioning device for logistics supply chain according to claim 3, characterized in that: The telescopic assembly includes a bottom hole which is opened upward from the center position of the bottom of the horizontal column and is connected to the telescopic cavity. A pulling rope is fixedly installed on one side wall of the sliding block facing the baffle. The end of the pulling rope away from the sliding block passes through the bottom hole and the conveyor belt and is fixedly installed with a control block. The control block is made of magnetic material. The two side walls opposite to each other of the two groups of vertical plates are respectively fixedly installed with first brackets. The two groups of first brackets extend to the inner cavity of the conveyor belt and are jointly fixedly installed with a magnetic positioning block that cooperates with the control block.

5. A positioning device for logistics supply chain according to claim 4, characterized in that: The side wall of the control block is provided with an auxiliary positioning part, and when the control block is separated from the magnetic positioning block, the auxiliary positioning part is used to limit the moving track of the control block.

6. A positioning device for logistics supply chain according to claim 5, characterized in that: The auxiliary positioning part includes auxiliary positioning blocks fixedly installed on two side walls opposite to the control block, and guide grooves are opened on the surface of the auxiliary positioning blocks. Second brackets are fixedly installed on the two side walls opposite to each other of the two groups of vertical plates, and the second brackets extend into the inner cavity of the conveyor belt and are fixedly installed with guide rods that cooperate with the guide grooves.

7. A positioning device for logistics supply chain according to claim 4, characterized in that: A protection wheel that cooperates with the pulling rope is rotatably installed in the telescopic cavity.

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