Entrance and exit entrance guard for constructional engineering site

By improving the interception components and cover structure of the access control, the problems of difficulty in replacing damaged interception components and inconvenience in transporting and repairing the access control have been solved, the effect of rapid replacement and simplified operation has been achieved, and the work efficiency and safety of the construction site have been improved.

CN223373635UActive Publication Date: 2025-09-23RIZHAO BEI MUNICIPAL ENGINEERING CO LTD
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Patent Information

Application Number
CN202422483230.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-15
Publication Date
2025-09-23
Estimated Expiration
2034-10-15

AI Technical Summary

Technical Problem

The interception mechanism of the existing entrance and exit access control at construction sites is installed by bolts. When damaged, it is difficult to quickly replace it, which affects the passage of workers and makes the access control difficult to carry and repair.

Method used

The design of lower fixed cylinder, upper fixed cylinder, sliding rod, lifting spring and socket facilitates the quick removal and replacement of intercepting parts; the combination of electric push rod, sliding plate and universal wheel reduces the difficulty of carrying the access control; the cover assembly simplifies the disassembly of the access control for maintenance through the adjustment bolt and gear structure.

Benefits of technology

It enables quick replacement of intercepting parts, reduces the difficulty of access control transportation and maintenance, and improves work efficiency and safety at the construction site.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a field entrance and exit entrance guard, in particular to a constructional engineering field entrance and exit entrance guard which comprises a box body assembly, a cover plate assembly and an intercepting assembly, the cover plate assembly is arranged on the outer wall of one side of the box body assembly, and the intercepting assembly is arranged on the outer wall of one side of the box body assembly. The intercepting assembly comprises a driving motor, a first gear, a second gear, a first limiting base, a lower fixing cylinder, an intercepting piece, a second limiting base, an upper fixing cylinder, a sliding inserting rod, a jacking spring and an inserting base. The bottom end of the lower fixing cylinder is inserted into the top end of the first limiting base. When the intercepting assembly is damaged, the sliding insertion rods in the lower fixing cylinder and the upper fixing cylinder are pulled by two hands at the same time, then the sliding insertion rods drive the bayonet socket to slide in the lower fixing cylinder and the upper fixing cylinder, and then the bayonet socket can be separated from the first limiting seat and the second limiting seat, so that limitation between the intercepting piece and the first limiting seat and limitation between the intercepting piece and the second limiting seat are relieved; workers can conveniently and quickly detach the intercepting part for replacement, and the situation that the damaged intercepting part affects passing of the entrance guard by the workers is avoided.
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Description

Technical Field

[0001] The utility model relates to an on-site entrance and exit door control, in particular to an on-site entrance and exit door control for a construction project, and belongs to the technical field of construction projects. Background Art

[0002] In order to ensure the safety of construction projects, an access control system will be installed at the entrance of the construction site. The access control system can prevent unauthorized personnel from entering the construction site, thereby protecting the safety of personnel and property on the construction site, and at the same time can strictly control and manage personnel entering and leaving the construction site.

[0003] Chinese Patent No. CN218436779U provides a construction site entrance and exit access control system, which relates to the field of teaching construction engineering technology. The utility model includes an entrance device, a dust removal device, and a blocking device. The entrance device includes a gate and a gate. A groove is provided on one side of the gate. One side surface of the gate groove is connected to one side surface of the gate by a first rotating shaft. The dust removal device is installed on one side surface of the gate to prevent dust from the construction site from entering the access control system. The blocking device includes a second rotating shaft and a lever. One side surface of the second rotating shaft is connected to one side surface of the lever. The card reading area and camera monitoring of the utility model can check whether people and vehicles can enter. The fan reduces the temperature inside the gate. The dust removal net prevents dust from the construction site from entering the device. Compared with traditional entrance and exit access control systems, vehicles can be allowed to enter and exit, and unauthorized personnel cannot enter the construction site, ensuring the safety of others. The operation of the fan also avoids safety hazards caused by excessive temperature.

[0004] However, although the above case allows vehicles to enter and exit, and prevents unauthorized personnel from entering the construction site, thus ensuring the safety of others, and the operation of the fan also avoids safety hazards caused by excessive temperature, when the interception mechanism in the access control system is damaged, it is easy for the interception structure to be installed in the access control by bolts. As a result, the interception mechanism cannot be replaced in time when it is damaged, affecting the workers' passage through the access control.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The purpose of this utility model is to provide an entrance and exit access control system for a construction site in order to solve the above problems.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions: a construction site entrance and exit access control, including a box assembly, a cover assembly and an interception assembly, the cover assembly is arranged on the outer wall of one side of the box assembly, the interception assembly is arranged on the outer wall of one side of the box assembly, the interception assembly includes a drive motor, a gear 1, a gear 2, a limit seat 1, a lower fixed cylinder, an interception member, a limit seat 2, an upper fixed cylinder, a sliding rod, a jacking spring and a plug-in seat, the bottom end of the lower fixed cylinder is plugged into the top end of the limit seat 1, and the top of the upper fixed cylinder is plugged into the top end of the limit seat 1. The two ends are inserted in the top of the limit seat 2, and the two sliding rods are slidably inserted in the upper fixed cylinder and the lower fixed cylinder respectively. The socket seat is threadedly connected to one end of the sliding rod, and one end of the lifting spring is installed on the bottom end of the socket seat through a bolt. The sliding rod is inserted in the inside of the lifting spring, and the two ends of the intercepting member are respectively welded on the outer wall of one side of the upper fixed cylinder and the lower fixed cylinder. The gear 2 is installed on the outside of the limit seat 1 through a flat key, and the gear 1 is installed on the output end of the drive motor through a flat key. The gear 1 and gear 2 are meshed with each other.

[0008] Furthermore, the box assembly includes a box, an outer wall of one side of the box is provided with an installation area, and both sides of the inner wall of the installation area are provided with plug-in slots, and the limit seat 1 and the limit seat 2 are installed inside the plug-in slots through bearings.

[0009] Furthermore, a placement groove is provided at the bottom of the box, and two guide cylinders are installed on both sides of the top of the inner wall of the placement groove by bolts. An electric push rod is installed at the center of the top of the inner wall of the placement groove by bolts, and gear 1 and gear 2 are located inside the placement groove.

[0010] Furthermore, a sliding plate is installed at the output end of the electric push rod through bolts, and two universal wheels are installed on the outer walls on both sides of the bottom of the sliding plate through bolts. The output end of the electric push rod is fixedly connected to the sliding plate through bolts.

[0011] Furthermore, a placement area is provided on the outer wall of one side of the box, and two limit grooves are provided on both sides of the inner wall of the placement area. Card reading modules are embedded in the outer walls on both sides of the top of the box through bolts, and the bottom end of the card reading module extends into the interior of the placement area.

[0012] Furthermore, a power module and a control module are respectively installed on both sides of the bottom of the inner wall of the box by bolts, and the power module is electrically connected to the control module and the card reading module by wires.

[0013] Furthermore, the cover plate assembly includes a cover plate, a groove is provided on the outer wall of one side of the cover plate, an installation groove is provided on the outer wall of one side of the cover plate, an adjusting bolt is installed inside the groove through a bearing, and an adjusting gear is installed at one end of the adjusting bolt through a flat key, and the adjusting gear is located inside the installation groove.

[0014] Furthermore, two base plates are slidably connected inside the mounting groove, and two plug-in plates are installed on the outer wall of one side of the base plate by bolts, one end of the plug-in plate is plugged into the limiting groove, and connecting springs are installed on the outer walls of one side of the two base plates by bolts respectively, and a rack is installed on the outer wall of one side of the base plate by bolts, and the rack and the adjusting gear are engaged with each other.

[0015] The technical effects and advantages of the present invention are as follows: (1) by providing the lower fixed cylinder, upper fixed cylinder, sliding rod, lifting spring and plug-in seat, when the interception component is damaged and needs to be removed, both hands can be used to pull the sliding rod in the lower fixed cylinder and the upper fixed cylinder at the same time, and then the sliding rod will slide with the plug-in seat in the lower fixed cylinder and the upper fixed cylinder, and then the plug-in seat will be separated from the limit seat 1 and the limit seat 2, so that the restriction between the interception component and the limit seat 1 and the limit seat 2 is released, which is convenient for workers to quickly remove the interception component for replacement and avoid the damaged interception component affecting the workers' passage through the access control; (2) by providing the electric push rod, sliding plate, universal wheel and guide cylinder, when the access control needs to be moved, a command can be sent to the control module through an external remote control device, and then The control module will control the electric push rod to start, the sliding plate will unfold with the guide cylinder, and the sliding plate will move with the universal wheel. Then, as the sliding plate continues to descend, the box will leave the ground, exposing the universal wheel, so that workers can push the device to move on the ground, reducing the difficulty of moving the access control; (3) Through the set cover assembly, when the access control needs to be disassembled for maintenance, the adjusting bolt can be rotated with a tool. The adjusting bolt will rotate with the adjusting gear, and the adjusting gear will drive the two racks to move, so that the base plate and the plug-in board will move toward each other inside the installation slot. Then the plug-in board will leave the limit slot, so that the restriction between the cover and the box is released. This process can speed up the disassembly of the access control and facilitate workers to quickly repair the electrical equipment inside the box. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the box assembly and interception assembly of the utility model;

[0018] Figure 3 This is a schematic diagram of the box assembly structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the box plane structure of the utility model;

[0020] Figure 5 This is a schematic structural diagram of the cover assembly of the present utility model;

[0021] Figure 6 This is a side structural diagram of the cover plate of the present invention;

[0022] Figure 7 This is a schematic diagram of the structure of the interception component of the utility model;

[0023] Figure 8 It is a schematic diagram of the planar structure of the upper fixed cylinder of the present utility model.

[0024] In the figure: 100, box assembly; 101, box; 102, card reader module; 103, installation area; 104, limit slot; 105, power module; 106, control module; 107, installation slot; 108, guide cylinder; 109, electric push rod; 110, sliding plate; 111, universal wheel; 112, installation area; 113, plug-in slot; 200, cover assembly; 201, cover; 202, groove; 203, adjusting bolt; 204. Plug-in board; 205. Mounting slot; 206. Base plate; 207. Adjusting gear; 208. Connecting spring; 209. Rack; 300. Intercepting assembly; 301. Driving motor; 302. Gear 1; 303. Gear 2; 304. Limiting seat 1; 305. Lower fixing cylinder; 306. Intercepting member; 307. Limiting seat 2; 308. Upper fixing cylinder; 309. Sliding rod; 310. Lifting spring; 311. Plug-in seat. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] See also Figure 1-8As shown, a construction site entrance and exit access control includes a box assembly 100, a cover assembly 200 and an interception assembly 300. The cover assembly 200 is arranged on the outer wall of one side of the box assembly 100, and the interception assembly 300 is arranged on the outer wall of one side of the box assembly 100. The interception assembly 300 includes a drive motor 301, a gear 1 302, a gear 2 303, a limit seat 1 304, a lower fixed cylinder 305, an interception member 306, a limit seat 2 307, an upper fixed cylinder 308, a sliding rod 309, a lifting spring 310 and a socket 311. The drive motor 301 model is preferably 57BYGH650-23. When a worker passes through the access control, the door can be opened. When the card is swiped on the card reader module 102, the control module 106 will control the drive motor 301 to start according to the result read by the card reader module 102, and then the gear 1 302 will drive the gear 2 303 to rotate, and then the limit seat 1 304 will drive the lower fixed cylinder 305 to rotate, and the lower fixed cylinder 305 will drive the intercepting piece 306 and the connector to rotate around the limit seat 2 307, so that the intercepting piece 306 is folded up to facilitate the worker to pass through the access control. When the subsequent worker passes through the access control, under the control of the control module 106, the drive motor 301 will rotate in the opposite direction and repeat the above movement. Then the intercepting piece 306 will detach from the installation area 112 and unfold to form an access control intercepting mechanism.

[0027] As a technical optimization solution of the present invention, the bottom end of the lower fixed cylinder 305 is inserted into the top of the limit seat 1 304, and the top of the upper fixed cylinder 308 is inserted into the top of the limit seat 2 307. The two sliding rods 309 are slidably inserted into the upper fixed cylinder 308 and the lower fixed cylinder 305 respectively. The socket 311 is threadedly connected to one end of the sliding rod 309, and one end of the lifting spring 310 is installed on the bottom end of the socket 311 by a bolt. The sliding rod 309 is inserted into the lifting spring 310. The two ends of the intercepting member 306 are respectively welded to the outer wall of one side of the upper fixed cylinder 308 and the lower fixed cylinder 305. Gear 2 303 is installed on the outside of the limit seat 1 304 through a flat key, and gear 1 302 is installed on the output end of the drive motor 301 through a flat key. Gear 1 302 and gear 2 303 are meshed with each other.

[0028] As a technical optimization solution of the present invention, the box assembly 100 includes a box 101, an installation area 112 is provided on the outer wall of one side of the box 101, and plug-in slots 113 are provided on both sides of the inner wall of the installation area 112, and the limit seat 1 304 and the limit seat 2 307 are installed in the plug-in slot 113 through bearings, a placement slot 107 is provided at the bottom of the box 101, and two guide cylinders 108 are installed on both sides of the top of the inner wall of the placement slot 107 by bolts, and an electric push rod 109 is installed at the center of the top of the inner wall of the placement slot 107 by bolts, and the model of the electric push rod 109 is preferably THK, gear 1 302 and gear 2 303 are located inside the placement slot 107, the output end of the electric push rod 109 is installed with a sliding plate 110 by bolts, and two universal wheels 111 are installed on the outer walls of the bottom of the sliding plate 110 by bolts. A command is sent to the control module 106 through an external remote control device, and then the control module 106 will control the electric push rod 109 to start, the sliding plate 110 will unfold with the guide cylinder 108, and the sliding plate 110 will move with the universal wheel 111. Then, as the sliding plate 110 continues to descend, the box 101 will leave the ground, exposing the universal wheel 111, so that the worker can push the device to move on the ground. When the box 101 moves to the appropriate position, a command can be sent to the control module 106 again through the remote control device, and then the control module 106 will control the electric push rod 109 to close, and then the sliding plate 110 and the universal wheel 111 will retract into the placement groove 107, and the box 101 will fall to the ground, so that the access control falls smoothly on the ground. The output end of the electric push rod 109 is fixedly connected to the sliding plate 110 through bolts.

[0029] As a technical optimization solution of the present invention, a housing 101 has a housing area 103 on one side of the outer wall, and two limit slots 104 are provided on both sides of the inner wall of the housing area 103. A card reader module 102 is embedded in the outer walls of both sides of the top of the housing by bolts. The card reader module 102 is an access control card reader. The bottom of the card reader module 102 extends into the housing area 103. A power module 105 and a control module 106 are respectively installed on both sides of the bottom of the inner wall of the housing 101 by bolts. The power module 105 is composed of a lithium battery pack, a section circuit breaker, a transformer, etc., and can provide power to the access control system so that the access control system can continue to operate in the event of a power outage. The control module 106 is composed of a PLC controller, an intelligent chip, and an infrared receiver. It can receive information read by the card reader module 102 and information generated by the remote control device, so that the control module 106 controls the operation of the device. The power module 105 is electrically connected to the control module 106 and the card reader module 102 through wires.

[0030] As a technical optimization solution of the present invention, the cover assembly 200 includes a cover 201, a groove 202 is provided on the outer wall of one side of the cover 201, a mounting groove 205 is provided on the outer wall of one side of the cover 201, an adjusting bolt 203 is installed inside the groove 202 through a bearing, and an adjusting gear 207 is installed on one end of the adjusting bolt 203 through a flat key, the adjusting gear 207 is located inside the mounting groove 205, and two base plates 206 are slidably connected inside the mounting groove 205, and two plug-in plates 204 are installed on the outer wall of one side of the base plate 206 through bolts, one end of the plug-in plate 204 is plugged into the limiting groove 104, and the outer walls of one side of the two base plates 206 are respectively installed with connecting springs 208 through bolts. When the cover 201 is installed inside the placement area 103, under the action of the two connecting springs 208, the two base plates 206 The plug-in board 204 will slide inside the installation slot 205, so that one end of the plug-in board 204 is plugged into the limiting slot 104, so that the cover plate 201 is fixed on the box body 101. A rack 209 is installed on the outer wall of one side of the base plate 206 by bolts. When the access control needs to be disassembled for maintenance, the adjusting bolt 203 can be rotated with a tool, and the adjusting bolt 203 will rotate with the adjusting gear 207, and the adjusting gear 207 will drive the two racks 209 to move, so that the base plate 206 and the plug-in board 204 move toward each other inside the installation slot 205. Then the plug-in board 204 will be separated from the limiting slot 104, so that the restriction between the cover plate 201 and the box body 101 is released, which speeds up the disassembly of the access control and facilitates workers to quickly repair the electrical equipment inside the box body 101, and the rack 209 and the adjusting gear 207 are meshed with each other.

[0031] When the utility model is in use, a command can be sent to the control module 106 through an external remote control device, and then the control module 106 will control the electric push rod 109 to start, the sliding plate 110 will unfold with the guide cylinder 108, and the sliding plate 110 will move with the universal wheel 111. Then, as the sliding plate 110 continues to descend, the box 101 will leave the ground, so that the universal wheel 111 is exposed, so that the worker can push the device to move on the ground. When the box 101 moves to a suitable position, a command can be sent to the control module 106 again through the remote control device, and then the control module 106 The electric push rod 109 will be controlled to close, and then the sliding plate 110 and the universal wheel 111 will retract into the placement groove 107, and the box body 101 will fall to the ground, so that the access control will fall smoothly on the ground. Later, when the worker passes through the access control, he can swipe the access card on the card reader module 102. The control module 106 will control the drive motor 301 to start according to the result read by the card reader module 102, and then the gear 1 302 will drive the gear 2 303 to rotate, and then the limit seat 1 304 will drive the lower fixed cylinder 305 to rotate, and the lower fixed cylinder 305 will drive the intercepting piece 306 and the plug seat to rotate around the limit When the second limit seat 307 is rotated, the intercepting piece 306 is folded up to facilitate workers to pass through the access control. When the intercepting assembly 200 is damaged and needs to be removed, the sliding rod 309 in the lower fixed cylinder 305 and the upper fixed cylinder 308 can be pulled with both hands at the same time, and then the sliding rod 309 slides with the plug seat 311 in the lower fixed cylinder 305 and the upper fixed cylinder 308, and then the plug seat 311 will be separated from the limit seat 1 304 and the limit seat 2 307, so that the restriction between the intercepting piece 306 and the limit seat 1 304 and the limit seat 2 307 is released, which makes it convenient for workers to quickly remove the intercepting piece 306 and enter The fixing plate 201 can be replaced to prevent the damaged intercepting member 306 from affecting the workers' passage through the access control. When the access control needs to be disassembled for maintenance, the adjusting bolt 203 can be rotated with a tool, and the adjusting bolt 203 will rotate with the adjusting gear 207, and the adjusting gear 207 will drive the two racks 209 to move, so that the base plate 206 and the plug-in plate 204 move toward each other inside the installation groove 205. Then the plug-in plate 204 will be separated from the limit groove 104, so that the restriction between the cover plate 201 and the box body 101 is released, which speeds up the disassembly of the access control and facilitates the workers to quickly repair the electrical equipment inside the box body 101.

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0033] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A construction site entrance and exit access control system, comprising a box assembly (100), a cover assembly (200) and an interception assembly (300), characterized in that: The cover assembly (200) is arranged on the outer wall of one side of the box assembly (100), and the interception assembly (300) is arranged on the outer wall of one side of the box assembly (100). The interception assembly (300) includes a driving motor (301), a gear 1 (302), a gear 2 (303), a limit seat 1 (304), a lower fixed cylinder (305), an interception member (306), a limit seat 2 (307), an upper fixed cylinder (308), a sliding rod (309), a lifting spring (310) and a plug seat (311). The bottom end of the lower fixed cylinder (305) is plugged into the top end of the limit seat 1 (304), the top end of the upper fixed cylinder (308) is plugged into the top end of the limit seat 2 (307), and the two sliding rods (30 9) are respectively slidably plugged into the upper fixed cylinder (308) and the lower fixed cylinder (305), the plug seat (311) is threadedly connected to one end of the sliding rod (309), one end of the lifting spring (310) is installed on the bottom end of the plug seat (311) by a bolt, the sliding rod (309) is plugged into the lifting spring (310), the two ends of the intercepting member (306) are respectively welded on the outer wall of one side of the upper fixed cylinder (308) and the lower fixed cylinder (305), the gear 2 (303) is installed on the outside of the limit seat 1 (304) through a flat key, the gear 1 (302) is installed on the output end of the drive motor (301) through a flat key, and the gear 1 (302) and the gear 2 (303) are meshed with each other.

2. A construction site entrance and exit access control system according to claim 1, characterized in that: The box assembly (100) includes a box (101), an outer wall of one side of the box (101) is provided with an installation area (112), and both sides of the inner wall of the installation area (112) are provided with plug-in slots (113), and the first limiting seat (304) and the second limiting seat (307) are installed inside the plug-in slots (113) through bearings.

3. The construction site entrance and exit access control system according to claim 2, characterized in that: A placement groove (107) is provided at the bottom of the box body (101), and two guide cylinders (108) are installed on both sides of the top of the inner wall of the placement groove (107) by bolts. An electric push rod (109) is installed at the center of the top of the inner wall of the placement groove (107) by bolts, and the gear 1 (302) and the gear 2 (303) are located inside the placement groove (107).

4. A construction site entrance and exit access control system according to claim 3, characterized in that: The output end of the electric push rod (109) is fixedly connected to the sliding plate (110) via bolts, and two universal wheels (111) are fixedly connected to the sliding plate (110) via bolts on both sides of the outer wall of the bottom of the sliding plate (110).

5. The construction site entrance and exit access control system according to claim 2, characterized in that: A placement area (103) is provided on one side outer wall of the box body (101), and two limit slots (104) are provided on both sides of the inner wall of the placement area (103). Card reading modules (102) are embedded in the outer walls on both sides of the top of the box body (101) through bolts, and the bottom end of the card reading module (102) extends into the interior of the placement area (103).

6. The construction site entrance and exit access control system according to claim 5, characterized in that: A power module (105) and a control module (106) are respectively installed on both sides of the bottom of the inner wall of the box body (101) by means of bolts, and the power module (105) is electrically connected to the control module (106) and the card reading module (102) by means of wires.

7. The construction site entrance and exit access control system according to claim 5, characterized in that: The cover plate assembly (200) comprises a cover plate (201), a groove (202) is provided on one side outer wall of the cover plate (201), a mounting groove (205) is provided on one side outer wall of the cover plate (201), an adjusting bolt (203) is installed inside the groove (202) via a bearing, and an adjusting gear (207) is installed at one end of the adjusting bolt (203) via a flat key, and the adjusting gear (207) is located inside the mounting groove (205).

8. The construction site entrance and exit access control system according to claim 7, characterized in that: Two base plates (206) are slidably connected inside the mounting groove (205), and two plug-in plates (204) are installed on the outer wall of one side of the base plate (206) by means of bolts. One end of the plug-in plate (204) is plugged into the inner part of the limiting groove (104). Connecting springs (208) are installed on the outer walls of one side of the two base plates (206) by means of bolts respectively. A rack (209) is installed on the outer wall of one side of the base plate (206) by means of bolts, and the rack (209) and the adjusting gear (207) are meshed with each other.

Citation Information

Patent Citations

  • Entrance and exit entrance guard for constructional engineering site

    CN218436779U