Lower blocking device of dumb waiter lift car

Abstract

The utility model provides a lower blocking device of a dumb waiter lift car. The lower blocking device comprises a support, a supporting body and a limiting assembly. The support comprises a support body and a vertical sleeve. The support body is used for being fixedly connected into a main body structure of an elevator shaft. The vertical sleeve is fixed on the bracket main body; the supporting body comprises a supporting part and a rotating shaft part, the rotating shaft part is matched with the vertical sleeve to achieve horizontal rotation and vertical sliding, and the supporting part is fixedly connected with the rotating shaft part; the supporting part rotates to the interior of a running track of an elevator shaft in a first state and rotates to the exterior of the running track of the elevator shaft in a second state; the limiting assembly comprises a stop pin arranged on the supporting body, a first limiting part and a second limiting part, the first limiting part and the second limiting part are both arranged on the support, the stop pin and the first limiting part are matched to be used for limiting the supporting body to be locked in the first state, and the stop pin and the second limiting part are matched to be used for limiting the supporting body to be locked in the second state. The device has the advantages of being high in structural strength, convenient to operate, safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of elevators, in particular to a blocking device under a cargo elevator car. Background Art

[0002] A utility elevator is an elevator designed specifically for the vertical transportation of small goods. It has the characteristics of small space occupation, simple control, and high efficiency in transporting food.

[0003] During maintenance operations on the bottom of a service elevator car and its pit, the elevator car must be stopped at an appropriate location in the hoistway pit to allow maintenance personnel to perform related maintenance work. To facilitate safe pit access for maintenance personnel and avoid potential safety hazards associated with elevator operation during maintenance, the national standard GB 25194 sets specific requirements for service elevator pit maintenance safety: "For service elevator pits where personnel are permitted access, a movable device shall be installed to ensure that, when the car is stopped on this device, a free vertical safety clearance of 1.80 meters is maintained between the lowest part of the car and the pit floor within an area measuring 0.20m x 0.20m. This device shall be permanently retained in the hoistway and its effectiveness shall be ensured."

[0004] Patent No. CN216945742U discloses an elevator car bottom squat prevention device, which uses an operating member 5 and a sleeve 4 to be fixed by manually tightening four butterfly screws. The installation and fixation reliability is low. Without relying on manual tightening with installation tools, the tightening torque cannot be guaranteed. The sleeve 4 and the operating member 5 are prone to loosening. After the position of the sleeve 4 is offset, the limit switch cannot be triggered, and the entire prevention device will not be able to operate, thereby failing to prevent accidental movement of the car.

[0005] In summary, the technical solutions provided in the prior art have problems such as low structural strength, inconvenient operation, and insufficient safety, and need to be innovated and upgraded. Utility Model Content

[0006] The purpose of the utility model is to address the deficiencies of the prior art and thus provide a blocking device under a cargo elevator car which has high structural strength, is easy to operate, and is safe and reliable.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is: a blocking device under a cargo elevator car, comprising a bracket, a support body and a limit assembly;

[0008] The bracket includes a bracket body and a vertical sleeve. The bracket body is used to be connected and fixed to the main structure of the elevator shaft. The vertical sleeve is fixed to the bracket body and serves as a basic structure for the horizontal rotation of the support body.

[0009] The support body includes a horizontally arranged support portion and a vertically arranged rotating shaft portion, wherein the rotating shaft portion cooperates with the vertical sleeve to realize horizontal rotation and vertical sliding, and the support portion is fixedly connected to the rotating shaft portion to serve as a support structure for limiting the downward movement of the elevator; the support portion rotates to the inside of the running track of the elevator shaft in a first state, and rotates to the outside of the running track of the elevator shaft in a second state;

[0010] The limiting assembly includes a stop pin arranged on the support body and a first limit part and a second limit part both arranged on the bracket. The stop pin cooperates with the first limit part to limit the support body from being locked in the first state, and the stop pin cooperates with the second limit part to limit the support body from being locked in the second state.

[0011] Preferably, a micro switch is further included, which is installed on a support body and is linked to the electrical system of the elevator. In a first state, the contacts of the micro switch cooperate with the first limit portion to close / open, and in a second state, the contacts of the micro switch cooperate with the second limit portion to open / close.

[0012] Preferably, the bracket body includes at least one group of fixing components, and the fixing components include a horizontal rectangular steel pipe, a connecting plate and a vertical rectangular steel pipe. The outer end of the horizontal rectangular steel pipe is fixed to the connecting plate by bolts or welding, the inner end of the horizontal rectangular steel pipe is welded and fixed to the vertical rectangular steel pipe, and the vertical sleeve is fixed to the vertical rectangular steel pipe. Each group of fixing components is distributed along the vertical direction.

[0013] Preferably, the support body has a triangular structure as a whole, the rotating shaft portion is a rotating shaft guide rod that cooperates with the vertical sleeve, and the supporting portion is a connecting shaft. One end of the connecting shaft is threadedly connected to the top end of the rotating shaft guide rod, and the other end of the connecting shaft and the bottom end of the rotating shaft guide rod are respectively hinged to the two ends of the supporting shaft. The supporting shaft serves as the hypotenuse of the triangular structure, and the rotating shaft guide rod and the connecting shaft serve as the right-angled sides of the triangular structure.

[0014] Preferably, a support plate is fixedly mounted on the top end of the connecting shaft for supporting the elevator car.

[0015] Preferably, a fixing plate is fixedly mounted on the inner bottom end of the connecting shaft, and the stop pin and the micro switch are mounted on the fixing plate.

[0016] Preferably, the angle between the first limiting portion and the second limiting portion in projection on the horizontal plane is 90°, the first limiting portion includes a first limiting plate installed on the inner side of the vertical rectangular steel pipe, and a through-hole is set on the first limiting plate corresponding to the stop pin, and the second limiting portion includes a second limiting plate installed on the other side of the vertical rectangular steel pipe, and a through-hole is set on the second limiting plate corresponding to the stop pin.

[0017] Preferably, the installation height of the first limit plate is higher than the installation height of the second limit plate, and the upper edge of the vertical sleeve serves as an auxiliary support part. In the first state, the stop pin is inserted into the through hole of the first limit plate, and the connecting shaft does not contact the upper edge of the vertical sleeve. In the second state, the stop pin is inserted into the through hole of the second limit plate, and the connecting shaft contacts the upper edge of the vertical sleeve.

[0018] Preferably, in the first state, the contact of the micro switch is in contact with the first limit plate and is closed, and in the second state, the contact of the micro switch is not in contact with the second limit plate.

[0019] Preferably, the bracket body is connected to the main rail of the elevator shaft.

[0020] The present invention has substantial features and progress over the prior art. Specifically, the present invention has the following advantages:

[0021] The blocking device uses a triangular stable structure as a support body, and has high structural strength; it blocks the elevator car from continuing to descend through horizontal rotation, and is easy to operate; the overall structure is stable and firm, and the blocking pin only plays a limiting role. The blocking structure is connected to the main structure of the elevator shaft as a whole, which is safe and reliable.

[0022] Furthermore, a micro switch is added, and the micro switch is linked with the electrical system of the elevator. The service elevator is doubly restricted by mechanical and electrical switches to avoid accidental startup of the elevator during maintenance and causing harm to pit maintenance personnel, further improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a front view of a blocking device under a cargo elevator car in the utility model.

[0024] Figure 2 This is one of the three-dimensional structural schematic diagrams of a blocking device under a cargo elevator car in the utility model.

[0025] Figure 3 This is the second schematic diagram of the three-dimensional structure of a blocking device under a cargo elevator car in the present utility model.

[0026] Figure 4 This is a schematic diagram of the application of a blocking device under a cargo elevator car in the second state in the utility model.

[0027] Figure 5 This is a schematic diagram of the application of a blocking device under a cargo elevator car in the first state in the utility model.

[0028] In the figure: 1. Bracket; 2. Support body; 3. Limit assembly; 4. Micro switch; 5. Stop device under the service elevator car; 6. Main rail; 7. Car; 11. Horizontal rectangular steel pipe; 12. Connecting plate; 13. Vertical rectangular steel pipe; 14. Vertical sleeve; 21. Rotating shaft guide rod; 22. Connecting shaft; 23. Support shaft; 24. Support plate; 25. Fixed plate; 31. Stop pin; 32. First limit plate; 33. Second limit plate. DETAILED DESCRIPTION

[0029] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0030] like Figure 1-Figure 5 As shown, a blocking device under a cargo elevator car includes a bracket 1, a support body 2 and a limiting assembly 3.

[0031] The bracket 1 includes a bracket body and a vertical sleeve. The bracket body is used to be connected and fixed to the main structure of the elevator shaft; the vertical sleeve is fixed to the bracket body and serves as the basic structure for the horizontal rotation of the support body;

[0032] Specifically, in this embodiment, the bracket body includes at least one set of fixing components, which include a horizontal rectangular steel tube 11, a connecting plate 12, and a vertical rectangular steel tube 13. The outer end of the horizontal rectangular steel tube 11 is fixed to the connecting plate 12 by bolts or welding, the inner end of the horizontal rectangular steel tube 11 is fixed to the vertical rectangular steel tube 13 by welding, and the vertical sleeve 14 is fixed to the vertical rectangular steel tube 13. Each set of fixing components is distributed in the vertical direction. In this embodiment, there are two sets, which are fixed to the main rail 6 of the elevator shaft through the connecting plate 12. The height from the pit floor can be easily adjusted to ensure that when the car 7 stops on the blocking device, there is a free vertical safety distance of 1.80 meters between the lowest component of the car and the pit floor.

[0033] The support body 2 includes a horizontally arranged support portion and a vertically arranged rotating shaft portion. The rotating shaft portion cooperates with the vertical sleeve to realize horizontal rotation and vertical sliding. The support portion is fixedly connected to the rotating shaft portion to serve as a support structure for limiting the downward movement of the elevator. In a first state, the support portion rotates to the inside of the running track of the elevator shaft. In a second state, the support portion rotates to the outside of the running track of the elevator shaft.

[0034] Specifically, in this embodiment, the support body 2 has a triangular structure as a whole, the rotating shaft portion is a rotating shaft guide rod 21 that cooperates with the vertical sleeve, and the supporting portion is a connecting shaft 22. One end of the connecting shaft 22 is threadedly connected to the top end of the rotating shaft guide rod 21, and the other end of the connecting shaft 22 and the bottom end of the rotating shaft guide rod 21 are respectively hinged to the two ends of the support shaft 23. The support shaft 23 serves as the hypotenuse of the triangular structure, and the rotating shaft guide rod 21 and the connecting shaft 22 serve as the right-angled sides of the triangular structure.

[0035] A support plate 24 is fixedly mounted on the top end of the connecting shaft 22 for supporting the elevator car.

[0036] The limiting assembly 3 includes a stop pin 31 arranged on the support body and a first limit portion and a second limit portion both arranged on the bracket. Specifically, a fixing plate 25 is fixedly installed on the inner bottom end of the connecting shaft 22, and the stop pin 31 is installed on the fixing plate 25.

[0037] The stop pin 31 cooperates with the first limiting portion to limit the support body from being locked in the first state, and the stop pin 31 cooperates with the second limiting portion to limit the support body from being locked in the second state.

[0038] Specifically, in this embodiment, the angle between the projections of the first limiting portion and the second limiting portion on the horizontal plane is 90°, the first limiting portion includes a first limiting plate 32 installed on the inner side of the vertical rectangular steel pipe, and a through-hole is set on the first limiting plate corresponding to the stop pin, and the second limiting portion includes a second limiting plate 33 installed on the other side of the vertical rectangular steel pipe, and a through-hole is set on the second limiting plate corresponding to the stop pin.

[0039] In a preferred embodiment, a micro switch 4 is further included. The micro switch 4 is installed on a support body, specifically on a fixed plate 25. The micro switch 4 is linked to the electrical system of the elevator. In a first state, the contact of the micro switch 4 cooperates with the first limit portion to close / open, and in a second state, the contact of the micro switch cooperates with the second limit portion to open / close.

[0040] To cooperate with the working mode of the micro switch 4, the installation height of the first limit plate 32 is higher than the installation height of the second limit plate 33, and the upper edge of the vertical sleeve 14 serves as an auxiliary support part. In the first state, the stop pin 31 is inserted into the through hole of the first limit plate 32, and the connecting shaft 22 does not contact the upper edge of the vertical sleeve 14. In the second state, the stop pin 31 is inserted into the through hole of the second limit plate 33, and the connecting shaft 22 contacts the upper edge of the vertical sleeve 14, so that in the first state, the contacts of the micro switch are closed in contact with the first limit plate, and in the second state, the contacts of the micro switch are not in contact with the second limit plate.

[0041] Working principle description:

[0042] Generally, the blocking device 5 under the goods elevator car is in the second state, that is, the entire support body 2 is in the area outside the running track in the elevator shaft, and will not rotate horizontally under the restriction of the stop pin 31, preventing accidental rotation into the track and causing danger.

[0043] When protective support is needed, the staff lifts the entire support body 2 and moves the entire support body 2 upward. The stop pin 31 is pulled out from the through hole of the second limit plate 33, and then rotated horizontally 90° to the area within the running track, and then the stop pin 31 is inserted into the through hole of the first limit plate 32 for limiting. At this time, the entire support body 2 is located inside the running track, and the uppermost fixed plate 25 is used to support the elevator car.

[0044] Among them, the micro switch 4 is linked to the electrical system of the elevator. In the first state, that is, the entire blocking device is inside the elevator's running track and is in a supporting state, the safety circuit of the electrical system is disconnected and is in a maintenance state to prevent the elevator from accidentally running and causing danger. At the same time, the physical structure of the blocking structure itself plays a supporting and blocking role; in the second state, that is, the entire blocking device is outside the elevator's running track and is in a non-supporting state, the safety circuit of the electrical system is connected and is in a non-maintenance state, and the elevator can be powered and operated normally.

[0045] This double protection design can greatly improve the safety during the maintenance process.

[0046] Finally, it should be noted that: The above describes in detail the preferred embodiments of this patent, but this patent is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A blocking device under a cargo elevator car, characterized in that: It includes a bracket, a supporting body and a limiting component; The bracket includes a bracket body and a vertical sleeve. The bracket body is used to be connected and fixed to the main structure of the elevator shaft. The vertical sleeve is fixed to the bracket body and serves as a basic structure for the horizontal rotation of the support body. The support body includes a horizontally arranged support portion and a vertically arranged rotating shaft portion, wherein the rotating shaft portion cooperates with the vertical sleeve to realize horizontal rotation and vertical sliding, and the support portion is fixedly connected to the rotating shaft portion to serve as a support structure for limiting the downward movement of the elevator; the support portion rotates to the inside of the running track of the elevator shaft in a first state, and rotates to the outside of the running track of the elevator shaft in a second state; The limiting assembly includes a stop pin arranged on the support body and a first limit part and a second limit part both arranged on the bracket. The stop pin cooperates with the first limit part to limit the support body from being locked in the first state, and the stop pin cooperates with the second limit part to limit the support body from being locked in the second state.

2. The blocking device under the cargo elevator car according to claim 1, characterized in that: It also includes a micro switch, which is installed on a support body and is linked to the electrical system of the elevator. In a first state, the contact of the micro switch cooperates with the first limit part to close / open, and in a second state, the contact of the micro switch cooperates with the second limit part to open / close.

3. The blocking device under the cargo elevator car according to claim 2, characterized in that: The bracket body includes at least one group of fixing components, which include a horizontal rectangular steel pipe, a connecting plate and a vertical rectangular steel pipe. The outer end of the horizontal rectangular steel pipe is fixed to the connecting plate by bolts or welding, the inner end of the horizontal rectangular steel pipe is fixed to the vertical rectangular steel pipe by welding, and the vertical sleeve is fixed to the vertical rectangular steel pipe. Each group of fixing components is distributed along the vertical direction.

4. The blocking device under the cargo elevator car according to claim 2 or 3, characterized in that: The support body has a triangular structure as a whole, the rotating shaft portion is a rotating shaft guide rod that cooperates with the vertical sleeve, and the supporting portion is a connecting shaft. One end of the connecting shaft is threadedly connected to the top end of the rotating shaft guide rod, and the other end of the connecting shaft and the bottom end of the rotating shaft guide rod are respectively hinged to the two ends of the supporting shaft. The supporting shaft serves as the hypotenuse of the triangular structure, and the rotating shaft guide rod and the connecting shaft serve as the right-angled sides of the triangular structure.

5. The blocking device under the cargo elevator car according to claim 4, characterized in that: A support plate is fixedly mounted on the top end of the connecting shaft for supporting the elevator car.

6. The blocking device under the cargo elevator car according to claim 5, characterized in that: A fixing plate is fixedly mounted on the inner bottom end of the connecting shaft, and the stop pin and the micro switch are mounted on the fixing plate.

7. The blocking device under the cargo elevator car according to claim 6, characterized in that: The included angle between the first limiting portion and the second limiting portion in projection on the horizontal plane is 90°, the first limiting portion includes a first limiting plate installed on the inner side of the vertical rectangular steel pipe, and a through-hole is set on the first limiting plate corresponding to the stop pin, and the second limiting portion includes a second limiting plate installed on the other side of the vertical rectangular steel pipe, and a through-hole is set on the second limiting plate corresponding to the stop pin.

8. The blocking device under the cargo elevator car according to claim 7, characterized in that: The installation height of the first limit plate is higher than the installation height of the second limit plate, and the upper edge of the vertical sleeve serves as an auxiliary support part. In the first state, the stop pin is inserted into the through hole of the first limit plate, and the connecting shaft does not contact the upper edge of the vertical sleeve. In the second state, the stop pin is inserted into the through hole of the second limit plate, and the connecting shaft contacts the upper edge of the vertical sleeve.

9. The blocking device under the cargo elevator car according to claim 8, characterized in that: In the first state, the contact of the micro switch is in contact with the first limit plate and is closed. In the second state, the contact of the micro switch is not in contact with the second limit plate.

10. The blocking device under the cargo elevator car according to claim 9, characterized in that: The bracket body is connected to the main rail of the elevator shaft.

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