Assembly apparatus and assembly method for door contact switches

Abstract

The application discloses a kind of door contact switch assembly equipment and assembly method, the assembly equipment includes assembly module and carrier;Each assembly module includes rack, upper conveying chain and lower conveying chain;Upper conveying chain includes upper chain plate, upper connecting pin, upper roller and upper roller, and upper mounting seat, upper roller and upper roller are mutually nested, and gap is configured between upper roller and the upper roller and is configured as when the upper roller carries the carrier, the upper roller is contacted with the upper roller by being pressed;The assembly equipment further includes front rotation mechanism and rear rotation mechanism, and front rotation mechanism moves the carrier at the front end of the carrier recycling channel to the front end of the assembly conveying channel, and rear rotation mechanism moves the carrier at the rear end of the assembly conveying channel to the rear end of the carrier recycling channel;At least part of the assembly module is loaded with press fitting machine and / or detector.The door contact switch assembly equipment of the application is more flexible and convenient to use, and has good expansibility.

Description

Technical Field

[0001] This invention belongs to the field of assembly technology of door contact switches, and in particular relates to an assembly device and assembly method for a door contact switch. Background Technology

[0002] A door contact switch is an electrical component, and door contact switch assembly equipment is used to assemble door contact switches. For example, Chinese patent CN111136463A discloses a door contact switch assembly equipment, including a feeding mechanism, a first pressing mechanism, a second pressing mechanism, a testing device, and a discharging device. In assembling the door contact switch, this equipment first feeds the U-shaped component, the base, and the top cover separately through the feeding mechanism. Then, the first pressing mechanism presses the U-shaped component onto the base to form a first assembly. The second pressing mechanism presses the top cover onto the first assembly to form a component assembly. Next, the testing device performs a withstand voltage test on the component assembly, and finally, the component is discharged through the discharging device. The positions of the various modules in this assembly equipment cannot be arbitrarily changed, making it inconvenient to use and limiting its expandability. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides an assembly device and method for a door contact switch, which is flexible, convenient, and has good scalability, making it suitable for assembling various types of door contact switches.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An assembly device for a door contact switch includes multiple independent assembly modules and a carrier that moves between the assembly modules. At least two of the multiple independent assembly modules are arranged in a front-back direction. Each assembly module includes a frame, an upper conveyor chain, and a lower conveyor chain, which are arranged vertically and vertically on the frame at intervals.

[0006] The upper conveyor chain includes multiple upper chain plates, upper connecting pins for rotatably connecting adjacent upper chain plates, upper rollers and upper wheels disposed on the upper connecting pins, and an upper mounting base disposed on the frame. The multiple upper chain plates are connected into a closed loop by the multiple upper connecting pins. The upper rollers and upper wheels are nested together and configured to rotate around the upper connecting pins. The upper rollers are in contact with the upper mounting base, and the upper mounting base is located below the upper rollers. There is a gap between the upper rollers and the upper wheels, and the upper rollers are configured such that when the upper rollers carry the carrier, the upper rollers are compressed and contact the upper rollers.

[0007] The upper conveyor chains of adjacent assembly modules arranged in the front-to-back direction constitute an assembly conveying channel, and the lower conveyor chains constitute a carrier recovery channel.

[0008] The assembly equipment also includes a front turnover mechanism and a rear turnover mechanism. The front turnover mechanism is located on the front side of the frontmost assembly module to move the carrier at the front end of the carrier recovery channel to the front end of the assembly conveying channel. The rear turnover mechanism is located on the rear side of the rearmost assembly module to move the carrier at the rear end of the assembly conveying channel to the rear end of the carrier recovery channel.

[0009] At least a portion of the assembly module is equipped with a press machine and / or a detector.

[0010] In a preferred embodiment, the assembly equipment has a first working mode and a second working mode. In the first working mode, M assembly modules are arranged in a front-to-back direction between the front turnover mechanism and the rear turnover mechanism. In the second working mode, N assembly modules are arranged in a front-to-back direction between the front turnover mechanism and the rear turnover mechanism. M and N are both positive integers greater than 2, and M and N are not equal.

[0011] In a preferred embodiment, the assembly equipment has a first operating mode and a second operating mode, wherein at least one of the assembly modules has a different press-fitting machine and / or detector loaded in the first operating mode than it does in the second operating mode, or at least one of the assembly modules has a press-fitting machine and / or detector loaded in the first operating mode but not loaded in the second operating mode.

[0012] In a more preferred embodiment, in the first operating mode, the assembly equipment has a press-fitting machine mounted on the i-th assembly module and a detector mounted on the j-th assembly module; in the second operating mode, the i-th assembly module is not equipped with a press-fitting machine, and the j-th assembly module is equipped with both the press-fitting machine and the detector.

[0013] In a preferred embodiment, the upper conveyor chains of adjacent assembly modules arranged in the front-to-back direction are parallel to each other and have a spacing smaller than the front-to-back dimension of the carrier.

[0014] More preferably, the upper roller is fitted onto both ends of the upper roller, the outer diameter of the middle part of the upper roller is larger than the outer diameter of its two ends, the inner diameter of the upper roller is larger than the outer diameter of the ends of the upper roller and smaller than the outer diameter of the middle part of the upper roller, and the outer diameter of the upper roller is smaller than the outer diameter of the middle part of the upper roller.

[0015] In a preferred embodiment, the lower conveyor chain includes a plurality of lower chain plates, a lower connecting pin for rotatably connecting adjacent lower chain plates, a lower roller and a lower wheel disposed on the lower connecting pin, and a lower mounting seat disposed on the frame. The plurality of lower chain plates are connected in a closed loop by the plurality of lower connecting pins. The lower roller and the lower wheel are nested together and configured to rotate around the lower connecting pin. The lower roller and the lower mounting seat are in contact, and the lower mounting seat is located below the lower roller. There is a gap between the lower roller and the lower wheel, and the lower roller is configured such that when the lower roller carries the carrier, the lower roller is compressed and contacts the lower roller.

[0016] In a preferred embodiment, each assembly module includes an upper drive sprocket and an upper driven sprocket disposed on the front or rear side of the upper drive sprocket, the upper conveyor chain being supported by and driven by the upper drive sprocket; each assembly module includes a lower drive sprocket and a lower driven sprocket disposed on the front or rear side of the lower drive sprocket, the lower conveyor chain being supported by and driven by the lower drive sprocket.

[0017] In a preferred embodiment, the front turnover mechanism includes a first carrier tray movable in a vertical direction for carrying the carrier, the first carrier tray having a discharge position flush with and aligned with the front end of the assembly conveying channel and a feed position flush with and aligned with the front end of the carrier recycling channel.

[0018] In a preferred embodiment, the front turnover mechanism further includes a first pusher that can move in a front-back direction. The first pusher is located adjacent to the discharge position of the first carrier plate and configured to push the carrier on the first carrier plate into the assembly conveying channel.

[0019] In a preferred embodiment, the rear turnover mechanism includes a second carrier tray movable in a vertical direction for carrying the carrier, the second carrier tray having an infeed position flush with and aligned with the rear end of the assembly conveying channel and an outlet position flush with and aligned with the rear end of the carrier recycling channel.

[0020] In a more preferred embodiment, the rear turnover mechanism further includes a second pusher that can move in a front-back direction. The second pusher is located adjacent to the discharge position of the second carrier tray and configured to push the carrier on the second carrier tray into the carrier recycling channel.

[0021] In a preferred embodiment, the last assembly module is equipped with a lower cover press-fitting machine and a marking machine, and the other assembly module is equipped with a screw press-fitting machine.

[0022] In a preferred embodiment, the frame includes a cabinet and rollers disposed at the bottom of the cabinet. The front and rear surfaces of the cabinet are both vertically extending planes. The upper conveyor chain and the lower conveyor chain extend from the front surface of the cabinet to the rear surface of the cabinet. The pressing machine and / or detector are detachably disposed at the top of the cabinet. After the two assembly modules are connected, the rear surface of the front assembly module and the front surface of the rear assembly module are connected.

[0023] The present invention also adopts the following technical solution:

[0024] A method for assembling a door contact switch, using the aforementioned door contact switch assembly equipment, the assembly method comprising the following steps: a mode switching step of switching the assembly equipment from a first assembly mode to a second assembly mode, wherein in the first assembly mode the assembly equipment assembles a first type of door contact switch, and in the second assembly mode the assembly equipment assembles a second type of door contact switch.

[0025] In a preferred embodiment, the mode switching step includes:

[0026] Add or remove the assembly modules, and arrange each assembly module in a front-to-back manner between the front turnover mechanism and the rear turnover mechanism; and / or

[0027] Remove the press-fitting machine and / or detector from an assembly module, or load the press-fitting machine and / or detector onto an assembly module.

[0028] The present invention adopts the above solution, which has the following advantages compared with the prior art:

[0029] The assembly equipment for the door contact switch of the present invention has each assembly module set independently. During actual assembly, the number of assembly modules can be increased or decreased as needed. The press machine or detector can also be removed from one assembly module and mounted on another assembly module. It is more flexible and convenient to use, has good expandability, and can assemble different types of door contact switches. Attached Figure Description

[0030] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a perspective view of an assembly device for a door contact switch according to an embodiment of the present invention;

[0032] Figure 2The front view of the assembly equipment for the door contact switch;

[0033] Figure 3 A top view of the assembly equipment for the door contact switch;

[0034] Figure 4 A side view of the assembly equipment for the door contact switch;

[0035] Figure 5 This is a partial perspective view of the assembly apparatus according to an embodiment of the present invention;

[0036] Figure 6 for Figure 5 A magnified view of a section at point A in the middle;

[0037] Figure 7 for Figure 5 A magnified view of a section at point B in the middle;

[0038] Figure 8 for Figure 5 The top view shown;

[0039] Figure 9 This is a schematic diagram of the front turnover mechanism;

[0040] Figure 10 This is a schematic diagram of the subsequent turnover mechanism;

[0041] Figure 11 This is a schematic diagram of the first type of door contact switch;

[0042] Figure 12 A schematic diagram of the second type of door contact switch

[0043] Figure 13 This is another schematic diagram of the second type of door contact switch;

[0044] Figure 14 This is a schematic diagram of the assembly process for the first type of door contact switch;

[0045] Figure 15 This is a schematic diagram of the assembly process for the second type of door contact switch.

[0046] in,

[0047] 1. Assembly module; 11. Frame; 111. Cabinet; 112. Roller; 12. Upper conveyor chain; 121. Upper chain plate; 122. Upper connecting pin; 123. Upper roller; 124. Upper roller; 125. Upper mounting base; 13. Lower conveyor chain; 131. Lower chain plate; 132. Lower connecting pin; 133. Lower roller; 134. Lower roller; 135. Lower mounting base; 2. Carrier; 3. Assembly conveyor channel; 4. Carrier recovery channel; 5. 51. Front turnover mechanism; 51. First carrier plate; 511. Discharge position; 512. Infeed position; 52. First pusher; 6. Rear turnover mechanism; 61. Second carrier plate; 7. Material box; 8. Detector; 9. Upper drive sprocket; 91. Upper driven sprocket; 10. Lower drive sprocket; 102. Lower cover press-fitting machine; 103. Marking machine; 104. Screw press-fitting machine; 105. Human-machine interface; 106. Display screen; 110. Motor;

[0048] 200. Door contact switch; 201. Operating head; 2011. Assembly; 202. Switch housing; 2021. Upper housing; 2022. Lower housing; 203. Conductive sheet; 204. Connector. Detailed Implementation

[0049] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Reference Figures 1 to 15 As shown, this embodiment provides an assembly device for a door contact switch. The assembly device is 7360mm long, 550mm wide, and 1000mm high. The assembly device includes multiple independent assembly modules 1, a carrier 2 that moves between the assembly modules 1, a front turnover mechanism 5, and a rear turnover mechanism 6. At least two of the multiple independent assembly modules 1 are arranged in a front-to-back direction, and at least some of the assembly modules 1 are equipped with a press-fitting machine and / or a detector 8. In this embodiment, the rearmost assembly module 1 is equipped with a lower cover press-fitting machine 102, a marking machine 103, and a display screen 106, while another assembly module 1 is equipped with a screw press-fitting machine 104.

[0051] Furthermore, each assembly module 1 includes a frame 11, an upper conveyor chain 12, and a lower conveyor chain 13. The upper conveyor chains 12 and lower conveyor chains 13 are arranged vertically at intervals on the frame 11. The upper conveyor chains 12 of adjacent assembly modules 1 arranged in the front-back direction are parallel to each other and have a gap, which is smaller than the front-back dimension of the carrier 2. The upper conveyor chains 12 of adjacent assembly modules 1 arranged in the front-back direction constitute the assembly conveying channel 3, and the lower conveyor chains 13 constitute the carrier recovery channel 4.

[0052] The frame 11 includes a cabinet 111, casters 112 located at the bottom of the cabinet 111, and an operating human-machine interface 105. The front and rear surfaces of the cabinet 111 are both vertically extending planes. The upper conveyor chain 12 and the lower conveyor chain 13 extend from the front surface of the cabinet 111 to the rear surface of the cabinet 111. The press machine and / or detector 8 are detachably mounted on the top of the cabinet 111, that is, the press machine and / or detector 8 can be detached from the top of the cabinet 111 of one of the assembly modules 1 and installed on the cabinet 111 of another assembly module 1, which is more flexible and convenient to use. After the two assembly modules 1 are connected, the rear surface of the front assembly module 1 and the front surface of the rear assembly module 1 are connected.

[0053] Reference Figures 5 to 8 As shown, the upper conveyor chain 12 includes multiple upper chain plates 121, upper connecting pins 122 for rotatably connecting adjacent upper chain plates 121, upper rollers 123 and upper wheels 124 disposed on the upper connecting pins 122, and upper mounting seats 125 disposed on the frame 11. The multiple upper chain plates 121 are connected into a closed loop by multiple upper connecting pins 122. The upper rollers 123 and upper wheels 124 are nested together and configured to rotate around the upper connecting pins 122. The upper rollers 123 and upper mounting seats 125 are in contact, and the upper mounting seats 125 are located below the upper rollers 123. There is a gap between the upper wheels 124 and the upper rollers 123 and the upper rollers 124 are configured such that when the upper rollers 124 carry the carrier 2, the upper rollers 124 are pressed and contact the upper rollers 123.

[0054] Furthermore, the upper roller 123 is fitted onto both ends of the upper roller 124. The outer diameter of the middle part of the upper roller 123 is larger than the outer diameter of its two ends. The inner diameter of the upper roller 123 is larger than the outer diameter of the ends of the upper roller 124 and smaller than the outer diameter of the middle part of the upper roller 124. The outer diameter of the upper roller 123 is smaller than the outer diameter of the middle part of the upper roller 124.

[0055] The lower conveyor chain 13 includes multiple lower chain plates 131, a lower connecting pin 132 for rotatably connecting adjacent lower chain plates 131, a lower roller 133 and a lower wheel 134 disposed on the lower connecting pin 132, and a lower mounting seat 135 disposed on the frame 11. The multiple lower chain plates 131 are connected into a closed loop by multiple lower connecting pins 132. The lower roller 133 and the lower wheel 134 are nested together and configured to rotate around the lower connecting pin 132. The lower roller 133 contacts the lower mounting seat 135 and the lower mounting seat 135 is located below the lower roller 133. There is a gap between the lower roller 134 and the lower roller 133 and the lower roller 134 is configured such that when the lower roller 134 carries the carrier 2, the lower roller 134 is pressed and contacts the lower roller 133.

[0056] Each assembly module 1 includes an upper drive sprocket 9 and an upper driven sprocket 91 disposed on the front or rear side of the upper drive sprocket 9. The upper conveyor chain 13 is supported by the upper drive sprocket 9 and the upper driven sprocket 91 and is driven by the upper drive sprocket 9. The upper drive sprocket 9 is driven by a motor 110. Each assembly module 1 includes a lower drive sprocket 10 and a lower driven sprocket disposed on the front or rear side of the lower drive sprocket 10. The lower conveyor chain 13 is supported by the lower drive sprocket 10 and the lower driven sprocket 10 and is driven by the lower drive sprocket 10. The upper drive sprocket 9 is driven by a motor 110.

[0057] Combination Figure 9 and Figure 10 As shown, the front turnover mechanism 5 is located at the front of the foremost assembly module 1 to move the carrier 2 at the front end of the carrier recovery channel 4 to the front end of the assembly conveying channel 3. The rear turnover mechanism 6 is located at the rear of the last assembly module 1 to move the carrier 1 at the rear end of the assembly conveying channel 3 to the rear end of the carrier recovery channel 4. Further, the front turnover mechanism 5 includes a first carrier tray 51 and a first pusher 52. The first carrier tray 51 carries the carrier 2 and is movable in the vertical direction. The first carrier tray 51 has a discharge position 511 that is flush with and aligned with the front end of the assembly conveying channel 3 and a feed position 512 that is flush with and aligned with the front end of the carrier recovery channel 4. The first pusher 52 is movable in the front-back direction. The first pusher 52 is located adjacent to the discharge position of the first carrier tray 51 and configured to push the carrier 2 on the first carrier tray 51 into the assembly conveying channel 3.

[0058] The rear turnover mechanism 6 includes a second carrier tray 61 and a second pusher. The second carrier tray 61 carries the carrier 2 and is movable in the vertical direction. The second carrier tray 61 has an inlet position that is flush with and aligned with the rear end of the assembly conveying channel 3 and an outlet position that is flush with and aligned with the rear end of the carrier recycling channel 4. The second pusher is movable in the front-back direction. The second pusher is located adjacent to the outlet position of the second carrier tray 61 and configured to push the carrier 2 on the second carrier tray 61 into the carrier recycling channel 4.

[0059] In other embodiments, the assembly equipment has a first operating mode and a second operating mode. In the first operating mode, M assembly modules 1 are arranged in a front-to-back direction between the front turnover mechanism 5 and the rear turnover mechanism 6. In the second operating mode, N assembly modules 1 are arranged in a front-to-back direction between the front turnover mechanism 5 and the rear turnover mechanism 6. M and N are both positive integers greater than 2, and M and N are not equal.

[0060] Specifically, in this embodiment, the assembly equipment has a first operating mode and a second operating mode. At least one assembly module 1 has a different press-fitting machine and / or detector 8 installed in the first operating mode compared to the press-fitting machine and / or detector 8 installed in the second operating mode, or at least one assembly module 1 has a press-fitting machine and / or detector 8 installed in the first operating mode but not in the second operating mode. Specifically, in the first operating mode, the i-th assembly module 1 has a press-fitting machine installed, and the j-th assembly module 1 has a detector 8 installed; in the second operating mode, the i-th assembly module 1 does not have a press-fitting machine installed, and the j-th assembly module 1 has both a press-fitting machine and a detector 8 installed. That is, this assembly equipment is relatively flexible in use, has good scalability, and can be used to manufacture different types of door contact switches.

[0061] The assembly equipment described above is applicable to the assembly of different types of door contact switches, for example, it can be used for assembling... Figure 11 The door contact switch shown and Figure 12 and Figure 13 Another type of door contact switch is shown. When the assembly equipment is in the first operating mode, the assembly equipment is used for... Figure 11 The assembly of the door contact switch shown; when assembly is required. Figure 12 and Figure 13 When the door contact switch is shown, the assembly equipment is switched to the second working mode. Specifically, depending on the different assembly processes of the two door contact switches, the number of assembly modules is increased or decreased, and / or the position of the machine (press machine, testing machine, etc.) loaded on one or more assembly modules is adjusted. Figure 11 This is a schematic diagram of a first type of door contact switch 200, which includes a switch housing 202 and an operating head 201. The switch housing 202 includes a lower housing 2022 and an upper housing 2021. The lower housing 2022 forms a receiving space for various components disposed within the switch housing 202. The upper housing 2021 forms a cover plate for the switch housing 202. The operating head 201 has an assembly 2011 by means of which the operating head 201 can be fastened to the object to be monitored, for example, by screwing it on. Figure 12 and Figure 13This is a schematic diagram of a second type of door contact switch. The door contact switch includes a switch housing 202, a conductive sheet 203 disposed within the switch housing 202, and a connector 204 disposed within the switch housing 202 for connecting external wires. The switch housing 202 is mainly composed of an upper housing 2021 and a lower housing 2022.

[0062] This embodiment also provides an assembly method for a door contact switch, using the aforementioned door contact switch assembly equipment. The assembly method includes the following steps: a mode switching step of switching the assembly equipment from a first assembly mode to a second assembly mode. In the first assembly mode, the assembly equipment assembles a first type of door contact switch, and in the second assembly mode, the assembly equipment assembles a second type of door contact switch.

[0063] The mode switching steps include: adding or removing assembly modules 1, and setting each assembly module 1 in a front-to-back ground position between the front turnover mechanism 5 and the rear turnover mechanism 6; or removing the press machine and / or detector 8 from one assembly module and installing the press machine and / or detector 8 on another assembly module 1.

[0064] The assembly equipment for the door contact switch in this embodiment has two operating modes. In both operating modes, it assembles a switch as follows: Figures 11 to 13 The two types of door contact switches are shown. The assembly modules 1 of this assembly equipment are independent of each other, and the number of assembly modules 1 can be increased or decreased, and the positions of the press machine or detector can be changed. It is flexible and convenient to use, and can produce a variety of different types of door contact switches, with good expandability.

[0065] In the description of this invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0067] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and they should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An assembly device for a door contact switch, characterized in that, It includes multiple independent assembly modules and a carrier that moves between the assembly modules, at least two of the multiple independent assembly modules are arranged in a front-to-back direction; each assembly module includes a frame, an upper conveyor chain and a lower conveyor chain, the upper conveyor chain and the lower conveyor chain are arranged vertically and horizontally on the frame; The upper conveyor chain includes multiple upper chain plates, upper connecting pins for rotatably connecting adjacent upper chain plates, upper rollers and upper wheels disposed on the upper connecting pins, and an upper mounting base disposed on the frame. The multiple upper chain plates are connected in a closed loop by multiple upper connecting pins. The upper rollers and upper wheels are nested around each other and configured to rotate around the upper connecting pins. The upper rollers are in contact with the upper mounting base, and the upper mounting base is located below the upper rollers. There is a gap between the upper wheels and the upper rollers, and the upper rollers are configured such that when the upper rollers carry the carrier, the upper rollers are pressed and contact the upper rollers. The upper rollers are fitted onto the two ends of the upper rollers. The outer diameter of the middle part of the upper roller is larger than the outer diameter of its two ends. The inner diameter of the upper roller is larger than the outer diameter of the ends of the upper roller and smaller than the outer diameter of the middle part of the upper roller. The outer diameter of the upper roller is smaller than the outer diameter of the middle part of the upper roller. The upper conveyor chains of adjacent assembly modules arranged in the front-to-back direction constitute an assembly conveying channel, and the lower conveyor chains constitute a carrier recovery channel. The assembly equipment also includes a front turnover mechanism and a rear turnover mechanism. The front turnover mechanism is located on the front side of the frontmost assembly module to move the carrier at the front end of the carrier recovery channel to the front end of the assembly conveying channel. The rear turnover mechanism is located on the rear side of the rearmost assembly module to move the carrier at the rear end of the assembly conveying channel to the rear end of the carrier recovery channel. At least a portion of the assembly module is equipped with a press-fitting machine and / or a detector; The frame includes a cabinet and rollers disposed at the bottom of the cabinet. The front and rear surfaces of the cabinet are both vertically extending planes. The upper conveyor chain and the lower conveyor chain extend from the front surface of the cabinet to the rear surface of the cabinet. The pressing machine and / or detector are detachably disposed on the top of the cabinet. After the two assembly modules are connected, the rear surface of the front assembly module and the front surface of the rear assembly module are connected. Each assembly module includes a motor, and the upper conveyor chain and the lower conveyor chain are driven by the motor; The assembly modules are driven independently by their respective motors to drive the upper and lower conveyor chains.

2. The assembly equipment for the door contact switch according to claim 1, characterized in that, The assembly equipment has a first working mode and a second working mode. In the first working mode, M assembly modules are arranged in the front-to-back direction between the front turnover mechanism and the rear turnover mechanism. In the second working mode, N assembly modules are arranged in the front-to-back direction between the front turnover mechanism and the rear turnover mechanism. M and N are both positive integers greater than 2, and M and N are not equal.

3. The assembly equipment for the door contact switch according to claim 1, characterized in that, The assembly equipment has a first working mode and a second working mode. At least one of the assembly modules has a different press-fitting machine and / or detector loaded in the first working mode than it does in the second working mode, or at least one of the assembly modules has a press-fitting machine and / or detector loaded in the first working mode but not loaded in the second working mode.

4. The assembly equipment for the door contact switch according to claim 3, characterized in that, In the first working mode, the assembly equipment has a press-fitting machine installed on the i-th assembly module and a detector installed on the j-th assembly module; in the second working mode, the i-th assembly module is not equipped with a press-fitting machine, and the j-th assembly module is equipped with both the press-fitting machine and the detector.

5. The assembly equipment for the door contact switch according to any one of claims 1 to 4, characterized in that, The upper conveyor chains of adjacent assembly modules arranged in the front-to-back direction are parallel to each other and have a spacing smaller than the front-to-back dimension of the carrier.

6. The assembly equipment for the door contact switch according to any one of claims 1 to 4, characterized in that, The lower conveyor chain includes multiple lower chain plates, lower connecting pins for rotatably connecting adjacent lower chain plates, lower rollers and lower wheels disposed on the lower connecting pins, and a lower mounting seat disposed on the frame. The multiple lower chain plates are connected into a closed loop by the multiple lower connecting pins. The lower rollers and lower wheels are nested together and configured to rotate around the lower connecting pins. The lower rollers are in contact with the lower mounting seat, and the lower mounting seat is located below the lower rollers. There is a gap between the lower rollers and the lower wheels, and the lower rollers are configured such that when the lower rollers carry the carrier, the lower rollers are compressed and contact the lower rollers.

7. The assembly equipment for the door contact switch according to claim 6, characterized in that, Each assembly module includes an upper drive sprocket and an upper driven sprocket disposed on the front or rear side of the upper drive sprocket. The upper conveyor chain is supported by and driven by the upper drive sprocket and the upper driven sprocket. Each assembly module also includes a lower drive sprocket and a lower driven sprocket disposed on the front or rear side of the lower drive sprocket. The lower conveyor chain is supported by and driven by the lower drive sprocket and the lower driven sprocket.

8. The assembly equipment for the door contact switch according to any one of claims 1 to 4, characterized in that, The front turnover mechanism includes a first carrier plate that can move in the vertical direction to carry the carrier. The first carrier plate has a discharge position that is flush with and aligned with the front end of the assembly conveying channel and a feed position that is flush with and aligned with the front end of the carrier recycling channel.

9. The assembly equipment for the door contact switch according to claim 8, characterized in that, The front turnover mechanism further includes a first pusher that can move in the front-back direction. The first pusher is located near the discharge position of the first carrier plate and configured to push the carrier on the first carrier plate into the assembly conveying channel.

10. The assembly equipment for the door contact switch according to any one of claims 1 to 4, characterized in that, The rear turnover mechanism includes a second carrier tray that can move in the vertical direction to carry the carrier. The second carrier tray has an infeed position that is flush with and aligned with the rear end of the assembly conveying channel and an outfeed position that is flush with and aligned with the rear end of the carrier recycling channel.

11. The assembly equipment for the door contact switch according to claim 10, characterized in that, The rear turnover mechanism also includes a second pusher that can move in the front-back direction. The second pusher is located adjacent to the discharge position of the second carrier plate and configured to push the carrier on the second carrier plate into the carrier recycling channel.

12. The assembly equipment for the door contact switch according to any one of claims 1 to 4, characterized in that, The last assembly module is equipped with a lower cover press-fitting machine and a marking machine, and the other assembly module is equipped with a screw press-fitting machine.

13. A method for assembling a door contact switch, characterized in that, The assembly method of the door contact switch assembly equipment as described in any one of claims 1 to 12 includes the following steps: a mode switching step of switching the assembly equipment from a first assembly mode to a second assembly mode, wherein in the first assembly mode the assembly equipment assembles a first type of door contact switch, and in the second assembly mode the assembly equipment assembles a second type of door contact switch.

14. The assembly method of the door contact switch according to claim 13, characterized in that, The mode switching steps include: Add or remove the assembly modules, and arrange each assembly module in a front-to-back manner between the front turnover mechanism and the rear turnover mechanism; and / or Remove the press-fitting machine and / or detector from an assembly module, or load the press-fitting machine and / or detector onto an assembly module.

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