Alarm automatic assembly accessory feeding device

Abstract

The utility model relates to the technical field of alarms, in particular to an automatic assembly accessory feeding device for an alarm, which not only drives a base and an upper cover of the alarm to move synchronously and is convenient to feed and position, but also omits the use of a mechanical arm, saves the production cost and improves the working efficiency. Comprising a workbench, and the bottom end of the workbench is connected with the ground; the machine further comprises a base conveying mechanism, two sets of positioning mechanisms, an upper cover conveying mechanism, a pushing mechanism and a laminating mechanism, the base conveying mechanism is installed on the workbench and drives the base to move, and the two sets of positioning mechanisms are both installed on the workbench and can fix the base. The upper cover conveying mechanism is installed on the base conveying mechanism and drives the alarm upper cover to move, the pushing mechanism is installed on the positioning mechanism and pushes the alarm upper cover, and the attaching mechanism is installed on the positioning mechanism and drives the upper cover and the base to be attached, so that the upper cover and the base are assembled conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of alarms, in particular to a feeding device for automatic assembly accessories of alarms. Background Art

[0002] An alarm is an electronic product that uses sound, light, air pressure, etc. to remind or warn us that we should take certain actions in order to prevent or prevent the consequences of an event.

[0003] The existing alarm assembly line, for example, an assembly line for assembling alarms disclosed in the utility model patent with application number 201821068625.1, has a main structure including a frame and a mechanical arm mechanism and a mechanical claw mechanism both mounted on the frame, the mechanical arm mechanism including a longitudinal rotating base, the longitudinal rotating base mounted on the frame, the first articulated seat mounted on the longitudinal rotating base and axially rotating with the longitudinal rotating base as the axis, the rear side of the rotating seat is fixedly connected to the second articulated seat, the front end is rotatably connected to the cylinder mounting frame, the cylinder mounting frame is axially rotating with the rotating seat as the axis The first cylinder and the second cylinder are respectively installed on the left and right sides of the cylinder mounting frame; when in use, the robotic arm mechanism drives the robotic arm mechanism and makes the first air claw clamp the alarm cover, and then the rotating seat rotates, and the second air claw moves to the alarm base through the robotic arm mechanism and clamps the alarm base. After clamping, the robotic arm mechanism places the alarm base on the placement rack, and then the robotic arm mechanism controls the mechanical claw mechanism to move axially upward. The rotated alarm cover and the alarm base are on the same axis, so the connection between the cover and the alarm base can be completed by controlling the robotic arm to move downward.

[0004] However, most of the feeding devices on the existing alarm assembly lines lack the positioning between the two sets of accessories that need to be assembled, and require the cooperation of a robotic arm to grab the accessories, which wastes a lot of time and has relatively low work efficiency. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides an alarm automatic assembly accessories feeding device which not only drives the alarm base and the upper cover to move synchronously, facilitating loading and positioning thereof, but also eliminates the use of a robotic arm, saves production costs, and improves work efficiency.

[0006] The utility model discloses an automatic assembly accessories feeding device for an alarm, comprising a workbench, the bottom end of which is connected to the ground; the utility model also comprises a base conveying mechanism, two groups of positioning mechanisms, an upper cover conveying mechanism, a pushing mechanism and a bonding mechanism. The base conveying mechanism is installed on the workbench and drives the base to move, the two groups of positioning mechanisms are both installed on the workbench and can also fix the base, the upper cover conveying mechanism is installed on the base conveying mechanism and drives the upper cover of the alarm to move, the pushing mechanism is installed on the positioning mechanism and pushes the upper cover of the alarm, and the bonding mechanism is installed on the positioning mechanism to drive the upper cover and the base to bond, so as to facilitate their assembly; the alarm base is conveyed forward on the base conveying mechanism, and after being conveyed to a designated position, the two groups of positioning mechanisms cooperate to position it, and at the same time the upper cover conveying mechanism moves the upper cover of the alarm to a designated position, the pushing mechanism transports the upper cover of the alarm on the upper cover conveying mechanism to the bonding mechanism, and the bonding mechanism drives the upper cover of the alarm to descend, so as to facilitate its assembly with the alarm base.

[0007] Preferably, the base conveying mechanism includes a motor, a reducer, two groups of conveying rollers, a conveyor belt and multiple groups of partitions. The motor is installed on the workbench, the reducer is installed on the workbench, the two groups of conveying rollers are rotatably installed on the workbench and one group of conveying rollers is longitudinally connected to the reducer, the conveyor belt is tightly installed on the two groups of conveying rollers, and the multiple groups of partitions are installed on the conveyor belt; the alarm base is placed on the conveyor belt and located between the two groups of partitions, the spacing between the two groups of partitions is the same as the width of the alarm base, the motor is started, the motor drives the conveyor roller through the reducer, the conveyor roller drives the conveyor belt to rotate, the conveyor belt drives the alarm base to move forward, and the alarm base is fixed by the two groups of partitions.

[0008] Preferably, the positioning mechanism includes a baffle, a cylinder and a clamp, the bottom end of the baffle is connected to the top end of the workbench, the cylinder is installed on the baffle, the clamp is installed on the cylinder, and the two sets of positioning mechanisms are respectively installed on the left and right sides of the workbench; when the alarm base moves to the specified position and stops, the cylinder on the two sets of positioning mechanisms pushes the clamp to move to fix and clamp the left and right ends of the base to position the base.

[0009] Preferably, the upper cover conveying mechanism includes a transmission shaft 1, a reducer 2, two groups of conveying rollers 2 and a conveyor belt 2. The transmission shaft 1 is rotatably mounted on the reducer 1, the reducer 2 is mounted on the baffle, the two groups of conveying rollers 2 are both rotatably mounted on the baffle and one group is longitudinally connected to the reducer 2, and the conveyor belt 2 is tensioned and mounted on the two groups of conveying rollers 2; the alarm upper cover is placed on the conveyor belt 2, the reducer 1 drives the transmission shaft 1 to rotate, the transmission shaft 1 drives the conveyor roller 2 connected to it to rotate through the reducer 2, and the conveyor roller 2 drives the conveyor belt 2 to rotate, so that the alarm upper cover on the conveyor belt 2 and the alarm base are synchronously conveyed forward.

[0010] Preferably, the pushing mechanism includes a rotating shaft, a fixed plate, a spring, two groups of cylinders and a push plate, the rotating shaft is rotatably installed between the baffles of the two groups of positioning mechanisms, the fixed plate is installed on the rotating shaft, the spring is installed on the fixed plate, the two groups of cylinders are installed on the rotating shaft, and the push plate is installed on the top of the two groups of cylinders; when the alarm cover passes through the rotating shaft, the two groups of cylinders extend and begin to push the push plate, and the push plate pushes the alarm cover onto the fitting mechanism. Since cylinder two is tilted downward, the push plate contacts the upper surface of conveyor belt two after cylinder two extends, and conveyor belt two gives reaction force to cylinder two and the push plate, causing the rotating shaft to rotate upward, and the rotating shaft drives the fixed plate to compress the spring, thereby adjusting the direction of the push plate so that it can push the alarm cover to the fitting mechanism. When the alarm cover enters the fitting mechanism, the spring drives the fixed plate and the rotating shaft to rotate, and at the same time, cylinder two drives the push plate to contract, which is convenient for the next push.

[0011] Preferably, the fitting mechanism includes two motors, two sets of reducers three, two sets of transmission shafts three, two sets of bevel gears one, two sets of reciprocating screws, two sets of bevel gears two, a crossbeam, two sets of cylinders three and two sets of pull-out plates. The two sets of motors two are respectively mounted on the two sets of baffles, the two sets of reducers three are respectively mounted on the two sets of baffles, the two sets of transmission shafts three are respectively rotatably mounted on the two sets of reducers three, the two sets of bevel gears one are respectively mounted on the two sets of transmission shafts three, the two sets of baffles are provided with sliding grooves, the two sets of reciprocating screws are respectively rotatably mounted in the sliding grooves of the two sets of baffles, the two sets of bevel gears two are respectively mounted on the two sets of reciprocating screws, the crossbeam is slidably mounted on the two sets of reciprocating screws, the reciprocating screws are provided with through holes and two sets of grooves, the two sets of cylinders three are respectively mounted on the reciprocating Two sets of pull-out plates are respectively installed on two sets of cylinders three in two sets of grooves of the lead screw; the two sets of cylinders three extend and push the two sets of pull-out plates to close the through holes of the beam, and the push plates push the alarm cover to the top of the two sets of pull-out plates, and then start the two sets of motors two, the two sets of motors two respectively drive the two sets of transmission shafts three to rotate through the two sets of reducers three, the two sets of transmission shafts three drive the two sets of bevel gears one to rotate, the two sets of bevel gears one and the two sets of bevel gears two are meshed for transmission respectively, the two sets of bevel gears two drive the two sets of reciprocating lead screws to rotate, thereby driving the vehicle beam to slide down, when the beam slides down to the bottom, the two sets of cylinders three pull the two sets of pull-out plates, so that the alarm cover falls through the through holes of the beam to the alarm base, which is convenient for related equipment to assemble the alarm cover and base.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the alarm base is conveyed forward on the base conveying mechanism, and after being conveyed to the designated position, two sets of positioning mechanisms cooperate to position it, and at the same time, the upper cover conveying mechanism moves the alarm upper cover to the designated position, and the pushing mechanism transports the alarm upper cover on the upper cover conveying mechanism to the fitting mechanism, and the fitting mechanism drives the alarm upper cover to descend to facilitate its assembly with the alarm base. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a front view structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the axonometric structure of the base transmission mechanism and the positioning mechanism of the utility model;

[0015] Figure 3 It is a partially enlarged cross-sectional front view structural diagram of the positioning mechanism and the laminating mechanism of the utility model;

[0016] Figure 4 It is a cross-sectional axonometric structural diagram of the upper cover transmission mechanism of the utility model;

[0017] Figure 5 It is a partially enlarged axonometric structural schematic diagram of the pushing mechanism of the utility model.

[0018] Markings in the attached drawings: 01, workbench; 02, base transmission mechanism; 21, motor 1; 22, reducer 1; 23, transmission roller 1; 24, conveyor belt 1; 25, partition; 03, positioning mechanism; 31, baffle; 32, cylinder 1; 33, clamp; 04, upper cover transmission mechanism; 41, transmission shaft 1; 42, reducer 2; 43, transmission roller 2; 44, conveyor belt 2; 05, pushing mechanism; 51, rotating shaft; 52, fixed plate; 53, spring; 54, cylinder 2; 55, push plate; 06, fitting mechanism; 61, motor 2; 62, reducer 3; 63, transmission shaft 2; 64, bevel gear 1; 65, reciprocating screw; 66, bevel gear 2; 67, crossbeam; 68, cylinder 3; 69, pull-out plate. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively below with reference to the relevant drawings. The utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0020] Example 1

[0021] The utility model is an automatic assembly parts feeding device for alarms, comprising a workbench 01, the bottom end of which is connected to the ground; further comprising a base conveying mechanism 02, two sets of positioning mechanisms 03, an upper cover conveying mechanism 04, a pushing mechanism 05 and a bonding mechanism 06, wherein the base conveying mechanism 02 is mounted on the workbench 01 and drives the base to move, the two sets of positioning mechanisms 03 are both mounted on the workbench 01 and can also fix the base, the upper cover conveying mechanism 04 is mounted on the base conveying mechanism 02 and drives the upper cover of the alarm to move, the pushing mechanism 05 is mounted on the positioning mechanism 03 and pushes the upper cover of the alarm, and the bonding mechanism 06 is mounted on the positioning mechanism 03 to drive the upper cover and the base to bond, so as to facilitate their assembly; The conveying mechanism 02 includes a motor 21, a reducer 22, two groups of conveying rollers 23, a conveyor belt 24 and multiple groups of partitions 25. The motor 21 is installed on the workbench 01, the reducer 22 is installed on the workbench 01, the two groups of conveying rollers 23 are rotatably installed on the workbench 01 and one group of conveying rollers 23 is longitudinally connected to the reducer 22, the conveyor belt 24 is tensioned and installed on the two groups of conveying rollers 23, and multiple groups of partitions 25 are installed on the conveyor belt 24; the positioning mechanism 03 includes a baffle 31, a cylinder 32 and a clamping plate 33. The bottom end of the baffle 31 is connected to the top end of the workbench 01, the cylinder 32 is installed on the baffle 31, the clamping plate 33 is installed on the cylinder 32, and the two groups of positioning mechanisms 03 are respectively installed on the left and right sides of the workbench 01; the upper cover conveying mechanism 04 includes a transmission shaft 1 41, a reducer 2 42, two sets of conveying rollers 2 43 and a conveyor belt 2 44, the transmission shaft 1 41 is rotatably installed on the reducer 1 22, the reducer 2 42 is installed on the baffle 31, the two sets of conveying rollers 2 43 are both rotatably installed on the baffle 31 and one of the sets is longitudinally connected to the reducer 2 42, and the conveyor belt 2 44 is tensioned and installed on the two sets of conveying rollers 2 43; the laminating mechanism 06 includes a motor 2 61, two sets of reducers 3 62, two sets of transmission shafts 3 63, two sets of bevel gears 1 64, two sets of reciprocating screws 65, two sets of bevel gears 2 66, a crossbeam 67, two sets of cylinders 3 68 and two sets of pull-out plates 69, two sets The motor 2 61 is respectively mounted on the two groups of baffles 31, the two groups of reducers 3 62 are respectively mounted on the two groups of baffles 31, the two groups of transmission shafts 3 63 are respectively rotatably mounted on the two groups of reducers 3 62, the two groups of bevel gears 1 64 are respectively mounted on the two groups of transmission shafts 3 63, the two groups of baffles 31 are provided with sliding grooves, the two groups of reciprocating screws 65 are respectively rotatably mounted in the sliding grooves of the two groups of baffles 31, the two groups of bevel gears 2 66 are respectively mounted on the two groups of reciprocating screws 65, the crossbeam 67 is slidably mounted on the two groups of reciprocating screws 65, the reciprocating screws 65 are provided with through holes and two groups of grooves, the two groups of cylinders 3 68 are respectively mounted in the two groups of grooves of the reciprocating screws 65, and the two groups of pull-out plates 69 are respectively mounted on the two groups of cylinders 3 68;When it is working, first, place the alarm base on the conveyor belt 24 and between two groups of partitions 25. The spacing between the two groups of partitions 25 is the same as the width of the alarm base. Start the motor 21. The motor 21 drives the conveyor roller 23 through the reducer 22. The conveyor roller 23 drives the conveyor belt 24 to rotate. The conveyor belt 24 drives the alarm base to move forward and fix the alarm base through the two groups of partitions 25. When the alarm base moves to the specified position, it stops. The cylinder 32 on the two groups of positioning mechanisms 03 pushes the clamping plate 33 to move and fix the left and right ends of the base to position the base. At the same time, the alarm cover is placed on the conveyor belt 44. The reducer 22 drives the transmission shaft 41 to rotate. The transmission shaft 41 drives the connected conveyor roller 43 to rotate through the reducer 42. The conveyor roller 43 drives the conveyor belt 44 to rotate. The alarm cover on the conveyor belt 2 44 is synchronously transmitted forward with the alarm base, and the two sets of cylinders 3 68 extend to push the two sets of pull-out plates 69 to close the through-holes of the cross beam 67. The pushing mechanism 05 pushes the alarm cover to the top of the two sets of pull-out plates 69, and then starts the two sets of motors 2 61. The two sets of motors 2 61 drive the two sets of transmission shafts 3 63 to rotate through the two sets of reducers 3 62 respectively. The two sets of transmission shafts 3 63 drive the two sets of bevel gears 1 64 to rotate. The two sets of bevel gears 1 64 and the two sets of bevel gears 2 66 are meshed for transmission respectively. The two sets of bevel gears 2 66 drive the two sets of reciprocating screws 65 to rotate, thereby driving the cross beam 67 to slide down. When the cross beam 67 slides down to the bottom, the two sets of cylinders 3 68 pull the two sets of pull-out plates 69, so that the alarm cover falls through the through-holes of the cross beam 67 to the alarm base, which is convenient for the relevant equipment to assemble the alarm cover and base. ;

[0022] Example 2

[0023] like Figures 1 to 5As shown, an alarm automatic assembly parts feeding device of the utility model is based on Example 1; the pushing mechanism 05 includes a rotating shaft 51, a fixed plate 52, a spring 53, two groups of cylinders 54 and a push plate 55, the rotating shaft 51 is rotatably installed between the baffles 31 of the two groups of positioning mechanisms 03, the fixed plate 52 is installed on the rotating shaft 51, the spring 53 is installed on the fixed plate 52, the two groups of cylinders 54 are both installed on the rotating shaft 51, and the push plate 55 is installed on the top of the two groups of cylinders 54; when it is working, first, the alarm base is placed on the conveyor belt 24 and located between the two groups of partitions 25, the spacing between the two groups of partitions 25 is the same as the width of the alarm base, the motor 21 is started, and the motor 21 is driven by the reducer 2 2 drives the conveyor roller 23, the conveyor roller 23 drives the conveyor belt 24 to rotate, the conveyor belt 24 drives the alarm base to move forward, and the alarm base is fixed by two sets of partitions 25. When the alarm base moves to the specified position, it stops, and the cylinder 32 on the two sets of positioning mechanisms 03 pushes the clamping plate 33 to move to fix the left and right ends of the base to position the base. At the same time, the alarm cover is placed on the conveyor belt 44, and the reducer 22 drives the transmission shaft 41 to rotate. The transmission shaft 41 drives the conveyor roller 43 connected to it to rotate through the reducer 42. The conveyor roller 43 drives the conveyor belt 44 to rotate, so that the alarm cover on the conveyor belt 44 and the alarm base are synchronously transmitted forward. When the alarm cover After passing through the rotating shaft 51, the two groups of cylinder 2 54 extend and begin to push the push plate 55, and the push plate 55 pushes the alarm cover onto the fitting mechanism 06. Since the cylinder 2 54 is tilted downward, the push plate 55 contacts the upper surface of the conveyor belt 2 44 after the cylinder 2 54 extends. The conveyor belt 2 44 gives a reaction force to the cylinder 2 54 and the push plate 55, causing the rotating shaft 51 to rotate upward. The rotating shaft 51 drives the fixed plate 52 to compress the spring 53, thereby adjusting the direction of the push plate 55 so that it can push the alarm cover to the fitting mechanism 06. When the alarm cover enters the fitting mechanism 06, the spring 53 drives the fixed plate 52 and the rotating shaft 51 to rotate. At the same time, the cylinder 2 54 drives the push plate 55 to retract, which is convenient for the next push. The two groups of cylinders 3 68 extend and push the two groups The pull-out plate 69 closes the through hole of the cross beam 67, and the push plate 55 pushes the alarm cover to the top of the two sets of pull-out plates 69, and then starts the two sets of motors 2 61. The two sets of motors 2 61 drive the two sets of transmission shafts 3 63 to rotate through the two sets of reducers 3 62 respectively, and the two sets of transmission shafts 3 63 drive the two sets of bevel gears 1 64 to rotate. The two sets of bevel gears 1 64 and the two sets of bevel gears 2 66 are respectively meshed for transmission. The two sets of bevel gears 2 66 drive the two sets of reciprocating screws 65 to rotate, thereby driving the cross beam 67 to slide down. When the cross beam 67 slides down to the bottom, the two sets of cylinders 3 68 pull the two sets of pull-out plates 69, so that the alarm cover falls through the through hole of the cross beam 67 to the alarm base, which is convenient for related equipment to assemble the alarm cover and base.

[0024] The motor 21, reducer 22, reducer 2 42, motor 2 61 and reducer 3 62 of the utility model are purchased on the market. The technicians in the industry only need to install and operate them according to the accompanying instruction manuals, without the need for the technicians in this field to make creative efforts.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An alarm automatic assembly parts feeding device, comprising a workbench (01), the bottom end of the workbench (01) is connected to the ground; characterized in that: It also includes a base transmission mechanism (02), two sets of positioning mechanisms (03), an upper cover transmission mechanism (04), a pushing mechanism (05) and a bonding mechanism (06). The base transmission mechanism (02) is installed on the workbench (01) and drives the base to move. The two sets of positioning mechanisms (03) are both installed on the workbench (01) and can also fix the base. The upper cover transmission mechanism (04) is installed on the base transmission mechanism (02) and drives the upper cover of the alarm to move. The pushing mechanism (05) is installed on the positioning mechanism (03) and pushes the upper cover of the alarm. The bonding mechanism (06) is installed on the positioning mechanism (03) to drive the upper cover and the base to bond, so as to facilitate their assembly.

2. The alarm automatic assembly parts feeding device according to claim 1, characterized in that: The base conveying mechanism (02) comprises a motor (21), a reducer (22), two groups of conveying rollers (23), a conveyor belt (24) and a plurality of groups of partitions (25). The motor (21) is mounted on a workbench (01), the reducer (22) is mounted on the workbench (01), the two groups of conveying rollers (23) are both rotatably mounted on the workbench (01) and one group of conveying rollers (23) is longitudinally connected to the reducer (22), the conveyor belt (24) is tensionedly mounted on the two groups of conveying rollers (23), and the plurality of groups of partitions (25) are all mounted on the conveyor belt (24).

3. The alarm automatic assembly parts feeding device according to claim 1, characterized in that: The positioning mechanism (03) comprises a baffle (31), a cylinder (32) and a clamp (33). The bottom end of the baffle (31) is connected to the top end of the workbench (01). The cylinder (32) is mounted on the baffle (31). The clamp (33) is mounted on the cylinder (32). Two sets of positioning mechanisms (03) are respectively mounted on the left and right sides of the workbench (01).

4. The alarm automatic assembly parts feeding device as claimed in claim 3, characterized in that: The upper cover conveying mechanism (04) comprises a transmission shaft 1 (41), a reducer 2 (42), two groups of conveying rollers 2 (43) and a conveying belt 2 (44). The transmission shaft 1 (41) is rotatably mounted on the reducer 1 (22), the reducer 2 (42) is mounted on the baffle (31), the two groups of conveying rollers 2 (43) are both rotatably mounted on the baffle (31) and one group is longitudinally connected to the reducer 2 (42), and the conveying belt 2 (44) is tensionedly mounted on the two groups of conveying rollers 2 (43).

5. The alarm automatic assembly parts feeding device as claimed in claim 3, characterized in that: The pushing mechanism (05) comprises a rotating shaft (51), a fixed plate (52), a spring (53), two groups of cylinders (54) and a push plate (55); the rotating shaft (51) is rotatably mounted between the baffles (31) of the two groups of positioning mechanisms (03); the fixed plate (52) is mounted on the rotating shaft (51); the spring (53) is mounted on the fixed plate (52); the two groups of cylinders (54) are both mounted on the rotating shaft (51); and the push plate (55) is mounted on the top ends of the two groups of cylinders (54).

6. The alarm automatic assembly parts feeding device as claimed in claim 3, characterized in that: The laminating mechanism (06) comprises a second motor (61), two groups of reducers (62), two groups of transmission shafts (63), two groups of bevel gears (64), two groups of reciprocating screws (65), two groups of bevel gears (66), a crossbeam (67), two groups of cylinders (68) and two groups of pull-out plates (69). The two groups of motors (61) are respectively mounted on two groups of baffles (31), the two groups of reducers (62) are respectively mounted on two groups of baffles (31), the two groups of transmission shafts (63) are respectively rotatably mounted on the two groups of reducers (62), the two groups of bevel gears (66) are respectively mounted on the two groups of pull-out plates (69). The two sets of baffles (31) are respectively mounted on the two transmission shafts (63), the two baffles (31) are provided with sliding grooves, the two reciprocating screws (65) are respectively rotatably mounted in the sliding grooves of the two baffles (31), the two bevel gears (66) are respectively mounted on the two reciprocating screws (65), the crossbeam (67) is slidably mounted on the two reciprocating screws (65), the reciprocating screws (65) are provided with through holes and two sets of grooves, the two cylinders (68) are respectively mounted in the two sets of grooves of the reciprocating screws (65), and the two pull-out plates (69) are respectively mounted on the two cylinders (68).

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