CN115359951A - A XLPE insulated halogen-free low-smoke flame-retardant cable - Google Patents

Abstract

The invention discloses a cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable, which relates to the technical field of cables and includes a conductor, the outside of the conductor is covered with an insulating layer, and the outside of a plurality of the insulating layers is wrapped with a wrapping The outer part of the said tape is covered with a shielding layer, and the outer part of the said shielding layer is covered with a sheath; in this application, through the setting of the water spray mechanism, a plurality of balls can be synchronously pushed to move and come into contact with the cable for Cables with different diameters are supported to avoid excessive bending of the cables during the spraying process, resulting in uneven spraying and poor cooling effect; and through the drive motor one, the gear one drives the external gear to rotate, and then drives the hollow rotating cylinder to rotate, Then it drives multiple inclined nozzles to spray and cool the cable, and the rotating spray is more uniform and the cooling effect is better.

Description

A XLPE insulated halogen-free low-smoke flame-retardant cable

technical field

The invention relates to the technical field of cables, in particular to a cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable.

Background technique

Cables are mainly cables used to transmit and distribute electrical energy. It is often used in the lead-out lines of urban underground power grids and power stations. In power lines, the proportion of cables is gradually increasing, so power cables of various performance types should be produced, especially fire-resistant power cables. As lead-out lines, the fire-resistant performance Not only good, but also have strong mechanical properties.

In the patent number: 2020109149939, a low-smoke halogen-free BI class fire-resistant power cable is disclosed, which solves the problems of poor mechanical properties, easy deformation, easy breakage, low service life, and problems in the cable production process of existing halogen-free fire-resistant power cables. In the present invention, some water stains will remain on the surface of the cable when it is cooled by the water cooling tank, which will cause dust to adhere to the surface of the subsequent cable when it is taken up, which will affect the surface quality of the cable; this patent also has the following defects: by immersion method Cool the cable, and the hardness of the cable will increase when it is soaked in water, and it cannot be processed in water, so it cannot be shaped immediately, which will affect the later processing effect of the cable.

Contents of the invention

The object of the present invention is to provide a cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable to solve the following technical problems: the cable is cooled by soaking method, but the hardness of the cable will increase when soaked in water, and it cannot It is processed, so it cannot be shaped in the first time, which will affect the processing effect of the cable in the later stage.

The purpose of the present invention can be achieved through the following technical solutions:

A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable, including a conductor, the outside of the conductor is covered with an insulating layer, the outside of a plurality of the insulating layers is wrapped with tape, and the outside of the tape is covered with Covered with a shielding layer, the outside of the shielding layer is covered with a sheath;

The flame retardant cable is prepared through the following steps:

Step 1. First, wrap the insulating layer on the surface of the conductor through the extruder, then wrap the tape around the multiple insulating layers, then wrap the shielding layer on the surface of the tape through the extruder, and finally wrap the sheath Cover the surface of the shielding layer to get the cable body;

Step 2: cooling and cutting the cable body by forming equipment.

As a further solution of the present invention: the insulating layer is made of cross-linked polyethylene insulating material, the tape is wrapped with cabled polyester tape, the shielding layer is braided with copper wire, and the sheath is made of halogen-free low Smoke flame retardant polyolefin material.

As a further solution of the present invention: the working steps of the forming equipment are:

First pass the cable through the water inlet pipe, the hollow rotating cylinder, and through the water removal mechanism and cutting mechanism, and wind it on the winder. First, drive the motor 2 to drive the driving wheel to rotate. The driving wheel drives the driven wheel to rotate through the belt, and the driven wheel drives The bevel gear set rotates, one of the vertical bevel gears drives the threaded sleeve to rotate, and the threaded sleeve drives the threaded rod to rotate, and then synchronously pushes multiple balls to move and contact with the cable, which is used to support cables of different diameters and avoid spraying. The middle cable is bent too much, resulting in uneven spraying and poor cooling effect; then drive motor one, through gear one, drives the outer gear to rotate, and then drives the hollow rotating cylinder to rotate, and then drives multiple inclined nozzles to spray and cool the cable. The rotating spray is more uniform and the cooling effect is better;

Then, through the setting of the upper water suction wheel and the lower water suction wheel, it is convenient to absorb the water stains on the upper surface of the cooled cable, and can carry out dust removal;

Finally, start the air cylinder, push the Y-shaped plate to move, and drive the pin shaft to move through the setting of the guide inclined hole, and then drive the sliding plate and the cutter to move toward each other to cut off the cable.

As a further solution of the present invention: the molding equipment includes a base, a cooling box is fixedly installed at one end of the top of the base, a water removal mechanism is provided on one side of the cooling box, and a cutting device is provided on one side of the water removal mechanism. mechanism, two water spray mechanisms are installed symmetrically inside the cooling box, and the water mechanism includes a hollow rotating cylinder that is rotatably connected inside the cooling box, and a cable through hole is opened in the center of the hollow rotating cylinder. One end of the cylinder extends to the outside of the cooling box and is rotatably connected with the water inlet pipe. A through hole is provided at the center of the water inlet pipe. Motor two is fixedly installed on the other end surface of the hollow rotating cylinder. The output shaft of the motor two passes through the shaft and One end surface of the hollow rotating cylinder is connected with a driving wheel, the driving wheel is connected with a plurality of driven wheels through a belt, and the driven wheels are connected with the bevel gear set on the other end surface of the hollow rotating cylinder through a rotating shaft, and the bevel gear set is fixed A threaded sleeve is installed, the inner thread of the threaded sleeve is connected with a threaded rod, and the end of the threaded rod is movably connected with balls, and a plurality of spray nozzles are equidistantly arranged on the hollow rotating cylinder.

As a further solution of the present invention: a motor 1 is fixedly installed inside the cooling box, a gear 1 is fixedly installed on the output shaft of the motor 1, and the gear 1 is meshed with an external gear installed on the outer surface of the hollow rotating cylinder.

As a further solution of the present invention: the dewatering mechanism includes a mounting plate fixedly installed on the base, a fixed plate is fixedly installed on one side of the mounting plate, a return spring is fixedly installed on the top of the fixed plate, and the reset A movable plate is fixedly installed on the bottom of the spring, and a guide rod is fixedly installed on the top of the movable plate, and the guide rod runs through the fixed plate, and a row of upper water suction wheels is rotatably connected to the movable plate;

The mounting plate is also rotatably connected with a row of lower water suction wheels, and the upper water suction wheels are intersected with the lower water suction wheels.

As a further solution of the present invention: a guide plate is fixedly installed at one end of the movable plate, and a through hole is opened on the guide plate.

As a further solution of the present invention: the mounting plate and the movable plate are fixedly installed with plug shafts, the upper water suction wheel and the lower water suction wheel are evenly plugged with the plug shafts, and the ends of the plug shafts are screwed with fixed nut.

As a further solution of the present invention: both the upper water suction wheel and the lower water suction wheel are concave structures.

As a further solution of the present invention: the cutting mechanism includes a limiting plate fixedly installed on the mounting plate, an air cylinder is fixedly installed on the limiting plate, and a Y-shaped plate is fixedly installed on the end of the piston rod of the air cylinder, so Both sides of the Y-shaped plate are slidably connected with the L-shaped limit bar installed on the limit plate, the end of the Y-shaped plate is provided with a gap, and the Y-shaped plate is provided with a guide inclined hole. Sliding plates are installed symmetrically on the bit plate, cutters are fixedly installed on the inner sides of the two sliding plates, pin shafts are arranged on the two sliding plates, and the pin shafts are adapted to guide inclined holes.

Beneficial effects of the present invention:

The insulating layer of this application is made of cross-linked polyethylene insulating material, the tape is wrapped with cabled polyester tape, the shielding layer is braided with copper wire, and the sheath is made of halogen-free low-smoke flame-retardant polyolefin material; Selection can make the prepared cable have good flame retardancy, and the smoke emission of the cable is also small.

Through the setting of the water spray mechanism, this application can push multiple balls to move synchronously and contact the cables to support cables of different diameters, so as to avoid excessive bending of the cables during the spraying process, resulting in uneven spraying and poor cooling effect. Not good; and through the drive motor one, the gear one drives the external gear to rotate, and then drives the hollow rotating cylinder to rotate, and then drives multiple inclined nozzles to spray and cool the cable, the rotating spray is more uniform and the cooling effect is better; then Through the setting of the upper water suction wheel and the lower water suction wheel, it can not only play a role in pulling the cable, but also facilitate the absorption of water stains on the surface of cables with different diameters after cooling, and can also carry out dust removal to ensure that the water after being sprayed It can be processed quickly and is not easy to stick to dust; finally start the cylinder to push the Y-shaped plate to move, and through the setting of the guide inclined hole, it drives the pin shaft to move, and then drives the sliding plate and the cutter to move towards each other to cut off the cable and perform automatic cutting. Improve overall work efficiency.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is the structural representation of cross section of the present invention;

Fig. 2 is the overall structure schematic diagram of molding equipment of the present invention;

Fig. 3 is a schematic diagram of the internal structure of the cooling box of the present invention;

Fig. 4 is a schematic diagram of an end surface structure of the hollow rotating cylinder of the present invention;

Fig. 5 is a schematic view of another end face structure of the hollow rotary cylinder of the present invention;

6 is a schematic diagram of the overall structure of the water removal mechanism of the present invention;

7 is a schematic diagram of the overall structure of the cutting mechanism of the present invention;

Fig. 8 is a schematic view of the internal structure of the cutting mechanism of the present invention.

In the figure: 100, conductor; 200, insulating layer; 300, wrapping tape; 400, shielding layer; 500, sheath; 1, base; 2, cooling box; 3, water removal mechanism; 4, cutting mechanism; 22, motor One; 23, gear one; 24, external gear; 25, hollow rotating cylinder; 26, water inlet pipe; 27, arc support plate; 28, nozzle; 29, belt; 210, driving wheel; 211, driven wheel; 212, Motor two; 213, ball; 214, bevel gear group; 215, thread sleeve; 216, threaded rod; 31, mounting plate; 32, fixed plate; 33, guide rod; 34, movable plate; 35, upper suction wheel; 36 , guide plate; 37, through hole; 38, lower suction wheel; 39, return spring; 310, fixed nut; 311, plug-in shaft; 41, limit plate; 42, cylinder; 43, L-shaped limit bar; 44, Y-shaped plate; 45, inclined guide hole; 46, gap; 47, pin shaft; 48, sliding plate; 49, cutter.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Embodiment one

Please refer to Fig. 1, the present invention is a cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable, which includes a conductor 100, the outer part of the conductor 100 is covered with an insulating layer 200, and a plurality of insulating layers 200 The outside is wrapped with a wrapping tape 300, the outside of the wrapping tape 300 is covered with a shielding layer 400, and the outside of the shielding layer 400 is covered with a sheath 500; the insulating layer 200 is made of cross-linked polyethylene insulating material, so The wrapping tape 300 is wrapped with cabled polyester tape, the shielding layer 400 is braided with copper wire for shielding, and the sheath 500 is made of halogen-free low-smoke flame-retardant polyolefin material. Through the selection of the above materials, the prepared cable can have good flame retardancy, and the smoke emission of the cable is also small.

The flame retardant cable is prepared through the following steps:

Step 1. First, wrap the insulating layer 200 on the surface of the conductor 100 through an extruder, then wrap the wrapping tape 300 around a plurality of insulating layers 200, and then wrap the shielding layer 400 on the surface of the wrapping tape 300 through the extruder , and finally wrap the sheath 500 on the surface of the shielding layer 400 to obtain the cable body;

Step 2: cooling and cutting the cable body by forming equipment.

Embodiment two

Please refer to Fig. 2-8, the molding equipment includes a base 1, a cooling box 2 is fixedly installed on one end of the top of the base 1, and a water removal mechanism 3 is provided on one side of the cooling box 2, and the water removal One side of the mechanism 3 is provided with a cutting mechanism 4, and the inside of the cooling box 2 is symmetrically equipped with two water spraying mechanisms. The purpose of setting up the two water spraying mechanisms is to ensure the stability of the cable through the ball 213 in contact with the cable. There will be no excessive play, resulting in uneven spraying effect; the water mechanism includes a hollow rotating cylinder 25 that is rotatably connected inside the cooling box 2, and a cable through hole is opened in the center of the hollow rotating cylinder 25 to facilitate the penetration of the cable. One end of the hollow rotating cylinder 25 extends to the outside of the cooling box 2 and is connected to the water inlet pipe 26 in rotation. One end of the water inlet pipe 26 is connected to the pump body through a pipeline, so that the water inlet pipe 26 is convenient for transporting water to the hollow rotating cylinder 25 and sprayed out through the nozzle 28. And there will be no interaction with the rotating hollow rotating cylinder 25, the center of the water inlet pipe 26 is provided with a through hole, which is convenient for cables to pass through, and the other end surface of the hollow rotating cylinder 25 is fixedly installed with a motor two 212, The output shaft of the second motor 212 is connected to the driving wheel 210 on one end surface of the hollow rotating cylinder 25 through a rotating shaft, and the driving wheel 210 is connected to a plurality of driven wheels 211 through a belt 29, and the driven wheels 211 are connected to the hollow rotating cylinder through a rotating shaft. 25 is connected to the bevel gear set 214 on the other end surface, and the bevel gear set 214 is fixedly equipped with a threaded sleeve 215, and the internal thread of the threaded sleeve 215 is connected with a threaded rod 216, and the end of the threaded rod 216 is movably connected There are balls 213, which are convenient to synchronously drive the movement of the balls 213, and are convenient to clamp and support cables of different diameters; the hollow rotating cylinder 25 is also equidistantly provided with a plurality of nozzles 28; the inside of the cooling box 2 is fixedly installed with a motor 22, a gear 23 is fixedly installed on the output shaft of the motor 22, and the gear 23 is meshed with the external gear 24 installed on the outer surface of the hollow rotating cylinder 25 to drive the hollow rotating cylinder 25 to rotate, which is convenient to drive the nozzle 28 Rotate for more uniform spraying and better cooling.

The water removal mechanism 3 includes a mounting plate 31 fixedly installed on the base 1, a fixed plate 32 is fixedly installed on one side of the mounting plate 31, and a return spring 39 is fixedly installed on the top of the fixed plate 32, and the reset The bottom of the spring 39 is fixed with a movable plate 34. Through the setting of the return spring 39, the upper water suction wheel 35 has a moving buffer, which can properly squeeze the cable, and the dust removal effect is better, and it can be used for cables of different diameters. , the top of the movable plate 34 is fixedly equipped with a guide rod 33, the guide rod 33 runs through the fixed plate 32, and a row of upper water suction wheels 35 is rotatably connected on the movable plate 34; The water suction wheel 38, the upper water suction wheel 35 and the lower water suction wheel 38 are arranged crosswise. Through the setting of the upper water suction wheel 35 and the lower water suction wheel 38, it is convenient to absorb the water stains on the upper surface of the cooled cable, and dust can be removed.

One end of the movable plate 34 is fixedly mounted with a guide plate 36, and the guide plate 36 is provided with a through hole 37 for guiding the cables to avoid severe swinging of the cables. Both the mounting plate 31 and the movable plate 34 are fixedly equipped with an insertion shaft 311, and the upper water suction wheel 35 and the lower water suction wheel 38 are all inserted into the insertion shaft 311, and the ends of the insertion shaft 311 are threadedly connected with Fix the nut 310, socket the upper water suction wheel 35 and the lower water suction wheel 38 on the insertion shaft 311, and then install the fixed nut 310 on the insertion shaft 311 to limit the position of the water suction wheel to facilitate the installation and removal of the water suction wheel wheel; easy to operate. The upper water suction wheel 35 and the lower water suction wheel 38 are all concave structures, which are convenient for cables to be placed in the concave grooves. On the one hand, they are positioned, and on the other hand, the water absorption effect is better.

The cutting mechanism 4 includes a limiting plate 41 fixedly installed on the mounting plate 31, a cylinder 42 is fixedly installed on the limiting plate 41, and a Y-shaped plate 44 is fixedly installed on the end of the piston rod of the cylinder 42. Both sides of the Y-shaped plate 44 are slidably connected with the L-shaped limiting strip 43 installed on the limiting plate 41, the end of the Y-shaped plate 44 is provided with a gap 46, and the Y-shaped plate 44 is provided with a guide Slanted holes 45, sliding plates 48 are installed symmetrically on the limiting plate 41, cutters 49 are fixedly installed on the inner sides of the two sliding plates 48, pin shafts 47 are all arranged on the two sliding plates 48 , the pin shaft 47 is adapted to the inclined guide hole 45 . Start the cylinder 42, promote the Y-shaped plate 44 to move, and drive the bearing pin 47 to move through the setting of the guide inclined hole 45, and then drive the sliding plate 48 and the cutter 49 to move towards each other, and the cable is cut off.

The working principle of the present invention is as follows: firstly, the cable is passed through the water inlet pipe 26, the hollow rotating cylinder 25, and passed through the dewatering mechanism 3 and the cutting mechanism 4, and wound on the winding machine; firstly, the motor 212 is driven to drive the driving wheel 210 to rotate, The driving wheel 210 drives the driven wheel 211 to rotate through the belt, the driven wheel 211 drives the bevel gear set 214 to rotate, one of the vertical bevel gears drives the threaded sleeve 215 to rotate, the threaded sleeve 215 drives the threaded rod 21 to rotate, and then synchronously pushes a plurality of balls 213 to move, In contact with the cables, it is used to support cables of different diameters, avoiding excessive bending of the cables during the spraying process, resulting in uneven spraying and poor cooling effect; then drive the motor one 22 to drive the external gear 24 through the gear one 23 Rotate, and then drive the hollow rotating cylinder 25 to rotate, and then drive a plurality of inclined nozzles 28 to spray and cool the cable, the rotating spray is more uniform, and the cooling effect is better;

Then, through the setting of the upper water suction wheel 35 and the lower water suction wheel 38, it is convenient to absorb the water stains on the upper surface of the cooled cable, and dust can be removed;

Start the cylinder 42 at last, promote the movement of the Y-shaped plate 44, drive the bearing pin 47 to move through the setting of the guide inclined hole 45, and then drive the sliding plate 48 and the cutter 49 to move towards each other, and the cable is cut off.

An embodiment of the present invention has been described in detail above, but the content described is only a preferred embodiment of the present invention, and cannot be considered as limiting the implementation scope of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still belong to the scope covered by the patent of the present invention.

Claims (10)

1. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable, characterized in that it comprises a conductor, the outside of the conductor is covered with an insulating layer, and the outside of a plurality of the insulating layers is wrapped with a tape, so The outside of the tape is covered with a shielding layer, and the outside of the shielding layer is covered with a sheath; The flame retardant cable is prepared through the following steps: Step 1. First, wrap the insulating layer on the surface of the conductor through the extruder, then wrap the tape around the multiple insulating layers, then wrap the shielding layer on the surface of the tape through the extruder, and finally wrap the sheath Cover the surface of the shielding layer to get the cable body; Step 2: cooling and cutting the cable body by forming equipment. 2. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 1, characterized in that the insulating layer is made of cross-linked polyethylene insulating material, and the wrapping tape is made of cabled polyester tape The shielding layer is braided with copper wires, and the sheath is made of halogen-free low-smoke flame-retardant polyolefin material. 3. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 1, wherein the working steps of the forming equipment are: First pass the cable through the water inlet pipe, the hollow rotating cylinder, and pass through the water removal mechanism and the cutting mechanism, and wind it on the winder, then drive the motor 2 to drive the driving wheel to rotate, the driving wheel drives the driven wheel to rotate through the belt, and the driven wheel drives The bevel gear set rotates, one of the vertical bevel gears drives the threaded sleeve to rotate, and the threaded sleeve drives the threaded rod to rotate, and then synchronously pushes multiple balls to move and contact with the cable to support cables of different diameters; then drive motor 1, through The gear one drives the external gear to rotate, and then drives the hollow rotating cylinder to rotate, and then drives multiple inclined nozzles to spray and cool the cable; Then, through the upper water suction wheel and the lower water suction wheel, the water stains on the upper surface of the cooled cable are absorbed; Finally, start the air cylinder, push the Y-shaped plate to move, and drive the pin shaft to move through the setting of the guide inclined hole, and then drive the sliding plate and the cutter to move toward each other to cut off the cable. 4. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 3, wherein the molding equipment includes a base, and a cooling box is fixedly installed at one end of the top of the base, and the cooling box One side of the tank is provided with a water removal mechanism, and one side of the water removal mechanism is provided with a cutting mechanism, and two water spray mechanisms are symmetrically installed inside the cooling box, and the water mechanism includes a hollow tube connected by rotation inside the cooling box. Rotating cylinder, the center of the hollow rotating cylinder is provided with a cable through hole, one end of the hollow rotating cylinder extends to the outside of the cooling box and is rotatably connected with the water inlet pipe, the center of the water inlet pipe is provided with a through hole, and the hollow rotating cylinder The other end surface of the motor is fixedly installed with the second motor, the output shaft of the second motor is connected with the driving wheel on the end surface of the hollow rotating cylinder through the rotating shaft, the driving wheel is connected with a plurality of driven wheels through the belt, and the driven wheels are connected through the rotating shaft It is connected with the bevel gear set on the other end surface of the hollow rotating cylinder. A threaded sleeve is fixedly installed on the bevel gear set. The inner thread of the threaded sleeve is connected with a threaded rod, and the end of the threaded rod is movably connected with a ball. A plurality of spray heads are also equidistantly arranged on the hollow rotating cylinder. 5. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 4, wherein a motor 1 is fixedly installed inside the cooling box, and the output shaft of the motor 1 is fixedly installed There is a gear one, and the gear one is meshed with the external gear installed on the outer surface of the hollow rotating cylinder. 6. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 4, characterized in that, the water removal mechanism includes a mounting plate fixedly installed on the base, and one side of the mounting plate A fixed plate is fixedly installed, a return spring is fixedly installed on the top of the fixed plate, a movable plate is fixedly installed on the bottom of the return spring, a guide rod is fixedly installed on the top of the movable plate, and the guide rod runs through the fixed plate, so A row of upper water suction wheels is connected to the movable plate by rotation; The mounting plate is also rotatably connected with a row of lower water suction wheels, and the upper water suction wheels are intersected with the lower water suction wheels. 7. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 6, wherein a guide plate is fixedly installed at one end of the movable plate, and a through hole is opened on the guide plate. 8. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 6, characterized in that, both the mounting plate and the movable plate are fixedly installed with plug-in shafts, and the upper suction wheel, the lower The water-absorbing wheels are all plugged with the plug-in shaft, and the end of the plug-in shaft is screwed with a fixed nut. 9. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 8, characterized in that both the upper suction wheel and the lower water suction wheel are concave structures. 10. A cross-linked polyethylene insulated halogen-free low-smoke flame-retardant cable according to claim 6, wherein the cutting mechanism includes a limiting plate fixedly installed on the mounting plate, and the limiting plate A cylinder is fixedly installed, and a Y-shaped plate is fixedly installed at the end of the piston rod of the cylinder. Both sides of the Y-shaped plate are slidingly connected with the L-shaped limit strips installed on the limit plate. There is a gap at the end, a guide inclined hole is opened on the Y-shaped plate, a sliding plate is installed symmetrically on the limiting plate, and a cutter is fixedly installed on the inner side of the two sliding plates. Pin shafts are arranged on the sliding plates, and the pin shafts are adapted to the inclined guide holes.

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