Access door assembly with safety switch

Abstract

The utility model relates to an access door assembly with a safety switch, which is mounted at an opening of a sand making machine cavity and comprises a handle pin unit, a handle, a door frame, a hinge pin unit, a hinge frame, a lock pin, a stop pin unit and a contactor. The handle is rotatably connected with the other side of the opening of the cavity through a handle pin unit, the hinge frame is fixedly connected with the outer side of the door frame, one end of the hinge frame is hinged to the side, away from the handle pin unit, of the opening of the cavity through a hinge pin unit, a limiting switch is arranged on the lower portion of the hinge frame, and the limiting switch and the contactor are located on the same series circuit. The handle is fastened through the lock pin, and the lock pin drives the limit switch to be closed. According to the access door assembly with the safety switch, safety protection measures during equipment operation are achieved through the standard limit switch on the basis of the electrical principle, and a good safety production environment is provided for the site with low cost.

Description

Technical Field

[0001] The utility model relates to the field of sand making machines, in particular to an inspection door assembly with a safety switch. Background Art

[0002] The sand making machine currently produced can start the main motor regardless of whether the maintenance door is open, closed or not fully closed; on-site maintenance mainly relies on warning signs, which requires workers to have a high level of safety awareness. There are also some safety facilities on the market that can solve the above problems, but the cost is relatively high. Utility Model Content

[0003] In order to solve the technical problems existing in the prior art, the utility model provides a.

[0004] In order to achieve the above object, the technical solution of the utility model is as follows:

[0005] A maintenance door assembly with a safety switch is installed at the opening of a sand making machine cavity, and includes a handle pin unit, a handle, a door frame, a hinge pin unit, a hinge frame, a lock pin, a stop pin unit and a contactor. The door frame matches the opening and the door frame is rotatably connected to one side of the opening. The handle is rotatably connected to the other side of the cavity opening through the handle pin unit. The hinge frame is fixedly connected to the outside of the door frame. One end of the hinge frame is hinged to the side of the cavity opening away from the handle pin unit through the hinge pin unit. A limit switch is provided at the bottom of the hinge frame. The limit switch and the contactor are in the same series circuit. When the door frame is closed, the handle is fastened by the lock pin, and the bottom end of the lock pin abuts against the limit switch to close the limit switch.

[0006] As a preferred technical solution, the handle pin unit includes a handle pin and a first clamping ring. The first clamping ring is rotatably mounted on the cavity through the handle pin, and one end of the handle is fixed to the first clamping ring.

[0007] As a preferred technical solution, the hinge pin unit includes a hinge pin and a second snap ring, one end of the hinge frame is rotatably connected to the cavity through the second snap ring and the hinge pin, and the other end of the hinge frame is installed on the outside of the door frame.

[0008] As a preferred technical solution, the locking pin is in an inverted L shape.

[0009] As a preferred technical solution, the stop pin unit includes two stop pin screws, which are installed one above and one below on the upper part of the hinge frame close to the hinge pin unit, and the distance between the two stop pin screws is greater than the diameter of the locking pin.

[0010] As a preferred technical solution, the end of the handle away from the handle pin unit is provided with a socket passing through the upper and lower surfaces of the handle, and two upper and lower locking plates are fixed on the door frame. The two locking plates are provided with vertically opposite through holes. When the door frame is closed, the end of the handle socket is located between the two locking plates, and the bottom end of the lock pin passes through the through hole of the upper lock plate, the socket and the through hole of the lower lock plate in sequence and contacts with the limit switch.

[0011] As a preferred technical solution, a protective cover is provided on the outer side of the limit switch, and the protective cover is fixed to the lower part of the hinge frame by installing screws.

[0012] As a preferred technical solution, the series circuit where the limit switch and the contactor are located also includes a power supply and a motor of the sand making machine.

[0013] As a preferred technical solution, a return spring is provided on the limit switch.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The inspection door assembly with a safety switch of the utility model realizes safety protection measures when the equipment is running based on the electrical principle through a standard limit switch, and provides a good safety production environment on site at a low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the maintenance door with a safety switch of the utility model in an open state;

[0017] Figure 2 It is a schematic diagram of the closed state of the inspection door with a safety switch of the utility model;

[0018] Figure 3 This is the action diagram of the limit switch in the inspection door assembly with safety switch of the utility model;

[0019] Figure 4 The utility model is an electrical schematic diagram of an inspection door assembly with a safety switch.

[0020] In the figure: 1. Handle pin; 2. First retaining ring; 3. Handle; 4. Door frame; 5. Hinge pin; 6. Second retaining ring; 7. Hinge frame; 8. Protective cover; 9. Limit switch; 10. Lock pin; 11. Stop pin screw; SB. Sand making machine switch; SQ. Limit switch contact; KM. Contactor; KM-1 contactor contact switch. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below in conjunction with specific implementation methods:

[0022] like Figure 1As shown, an inspection door assembly with a safety switch is installed at the opening of the sand making machine cavity, including a handle pin 1 unit, a handle 3, a door frame 4, a hinge pin 5 unit, a hinge frame 7, a lock pin 10, a stop pin unit and a contactor KM. The door frame 4 matches the opening and the door frame 4 is rotatably connected to one side of the opening. The handle 3 is rotatably connected to the other side of the cavity opening through the handle pin 1 unit. The hinge frame 7 is fixedly connected to the outside of the door frame 4. One end of the hinge frame 7 is hinged to the side of the cavity opening away from the handle pin 1 unit through the hinge pin 5 unit. A limit switch 9 is provided at the lower part of the hinge frame 7. Figure 4 As shown, the limit switch 9 and the contactor KM are in the same series circuit, the limit switch 9 is connected to the contactor KM, and the circuit also includes a power supply, a sand making machine switch SB and a motor. L1, L2, L3 represent three-phase electricity.

[0023] like Figure 2 As shown, when the door frame 4 is closed, the handle 3 is locked by the lock pin 10, and the bottom end of the lock pin 10 abuts against the limit switch 9 to close the limit switch 9. Figure 3 As shown, when the lock pin 10 locks the handle 3, the bottom end of the lock pin 10 touches the swing rod of the limit switch 9. When the lock pin 10 is inserted to the bottom, the swing rod is driven to swing, and the limit switch 9 changes from the disconnected state to the connected state. Figure 3 The right wire of the middle limit switch 9 is connected to the contactor KM, the contactor KM is energized, and the contactor contact switch KM-1 is closed, allowing the sand making machine switch SB to start the motor. On the contrary, after the inspection door is opened and the lock pin 10 is pulled out, the reset spring on the limit switch 9 is in a compressed state, which will bounce the limit switch 9 open and reset, the limit switch contact SQ is disconnected, the circuit is disconnected, the contactor KM is powered off, and the contactor contact switch KM-1 is disconnected. At this time, the sand making machine switch SB cannot be started whether it is closed or closed, that is, as long as the inspection door is opened, the equipment cannot be started, thereby realizing interlocking protection of the equipment and providing a safer production environment for the site.

[0024] The handle pin 1 unit comprises a handle pin 1 and a first snap ring 2 . The first snap ring 2 is rotatably mounted on the cavity through the handle pin 1 , and one end of the handle 3 is fixed on the first snap ring 2 .

[0025] The hinge pin 5 unit includes a hinge pin 5 and a second snap ring 6 . One end of the hinge frame 7 is rotatably connected to the cavity through the second snap ring 6 and the hinge pin 5 . The other end of the hinge frame 7 is mounted on the outer side of the door frame 4 .

[0026] like Figure 3 As shown, the locking pin 10 is in an inverted L-shape.

[0027] like Figure 2As shown, the stop pin unit includes two stop pin screws 11, which are installed one above the other on the upper part of the hinge frame 7 near the hinge pin 5 unit, and the distance between the two stop pin screws 11 is greater than the diameter of the lock pin 10. After the lock pin 10 is installed in place, the upper end of the lock pin 10 is horizontally rotated to between the two stop pin screws 11 to fix the position of the lock pin 10.

[0028] The end of the handle 3 away from the handle pin 1 unit is provided with a socket passing through the upper and lower surfaces of the handle 3, and two upper and lower locking plates are fixed on the door frame 4. The two locking plates are provided with vertically opposite through holes. When the door frame 4 is closed, the end where the socket of the handle 3 is located is located between the two locking plates, and the bottom end of the locking pin 10 passes through the upper locking plate through hole, the socket and the through hole of the lower locking plate in sequence and contacts with the limit switch 9, thereby locking the handle 3 when the inspection door is closed.

[0029] A protective cover 8 is provided on the outer side of the limit switch 9, and the protective cover 8 is fixed to the lower part of the hinge frame 7 by installing screws. The protective cover 8 is used to protect the limit switch 9.

[0030] This embodiment is only a further explanation of the present invention, not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. An inspection door assembly with a safety switch, installed at the opening of the sand making machine cavity, characterized in that: It includes a handle pin unit, a handle, a door frame, a hinge pin unit, a hinge frame, a lock pin, a stop pin unit and a contactor. The door frame matches the opening and is rotatably connected to one side of the opening. The handle is rotatably connected to the other side of the cavity opening through the handle pin unit. The hinge frame is fixedly connected to the outside of the door frame. One end of the hinge frame is hinged to the side of the cavity opening away from the handle pin unit through the hinge pin unit. A limit switch is provided at the bottom of the hinge frame. The limit switch and the contactor are in the same series circuit. When the door frame is closed, the handle is fastened by the lock pin, and the bottom end of the lock pin abuts against the limit switch to close the limit switch.

2. The inspection door assembly with a safety switch according to claim 1, characterized in that: The handle pin unit comprises a handle pin and a first clamping ring. The first clamping ring is rotatably mounted on the cavity through the handle pin, and one end of the handle is fixed on the first clamping ring.

3. The inspection door assembly with a safety switch according to claim 1, characterized in that: The hinge pin unit comprises a hinge pin and a second snap ring, one end of the hinge frame is rotatably connected to the cavity through the second snap ring and the hinge pin, and the other end of the hinge frame is mounted on the outer side of the door frame.

4. The inspection door assembly with a safety switch according to claim 1, characterized in that: The locking pin is in an inverted L shape.

5. The inspection door assembly with a safety switch according to claim 4, characterized in that: The stop pin unit comprises two stop pin screws, which are installed one above and one below on the upper part of the hinge frame close to the hinge pin unit, and the distance between the two stop pin screws is greater than the diameter of the locking pin.

6. The inspection door assembly with a safety switch according to claim 1, characterized in that: An end of the handle away from the handle pin unit is provided with a socket passing through the upper and lower surfaces of the handle, and an upper and lower locking plates are fixed to the door frame, and the two locking plates are provided with vertically opposite through holes. When the door frame is closed, the end of the handle socket is located between the two locking plates, and the bottom end of the lock pin passes through the through hole of the upper locking plate, the socket and the through hole of the lower locking plate in sequence and contacts with the limit switch.

7. The inspection door assembly with a safety switch according to claim 1, characterized in that: A protective cover is arranged on the outer side of the limit switch, and the protective cover is fixed to the lower part of the hinge frame by installing screws.

8. The inspection door assembly with a safety switch according to claim 1, characterized in that: The series circuit in which the limit switch and the contactor are located also includes a power supply and a motor of the sand making machine.

9. The inspection door assembly with a safety switch according to claim 1, characterized in that: A return spring is arranged on the limit switch.

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