Pneumatic hoist with limit stop
By installing a limit plate and limit rod at the bottom of the pneumatic hoist body, the problems of chain swaying and heavy object collision are solved, achieving stable chain limiting and protection of the height of the heavy object.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEBEI MUTIAN HOISTING EQUIP MFG CO LTD
- Filing Date
- 2025-07-28
- Publication Date
- 2026-07-21
AI Technical Summary
Existing pneumatic hoists are prone to chain swaying and instability during the lifting and lowering of heavy objects due to the different positions of the heavy objects and the inlet/outlet. Furthermore, the pneumatic hoist body is easily bumped when lifting heavy objects, and there is a lack of effective limit protection.
A limit plate is installed on the bottom mounting plate of the pneumatic hoist body, and it is elastically slidably connected to the limit rod. The chain passes through the sleeve and slides in contact with the sleeve. The chain is stably limited by the cooperation of the guide tube and the limit plate. When the limit plate triggers the alarm component, an alarm is issued to protect the lifting height of the heavy object.
It effectively prevents the chain from swaying when lifting heavy objects, keeps the chain stable, and stops the pneumatic hoist in time through the alarm component, thereby achieving height limit protection for heavy objects and avoiding collisions with the pneumatic hoist body.
Smart Images
Figure CN224530494U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pneumatic hoist technology, and in particular to a pneumatic hoist with a limit switch on the main body. Background Technology
[0002] Pneumatic hoists are widely used in industries such as petroleum, chemical, and automobile manufacturing, and are an indispensable piece of equipment for improving work efficiency.
[0003] Currently, through continuous improvement and innovation, most pneumatic hoists have limit protection functions. By setting limit protectors, the chain and load can be prevented from falling in the event of a sudden air supply interruption from the pneumatic motor. However, since the chain is adjusted through an inlet and outlet on the pneumatic hoist, existing technology has few limiting measures for the chain. This leads to instability and chain swaying during the lifting and lowering of loads due to the difference in position between the load and the inlet / outlet. Furthermore, when lifting loads, it is also necessary to limit the chain height to prevent the lifted load and hook from colliding with the pneumatic hoist body. Therefore, there is an urgent need for a pneumatic hoist with a built-in limit switch to solve the above-mentioned problems. Utility Model Content
[0004] The purpose of this utility model is to provide a pneumatic hoist with a limit switch on the main body to solve the problems existing in the prior art, thereby improving the stability of the chain during the winding and unwinding process and effectively limiting the lifting height of heavy objects.
[0005] To achieve the above objectives, this utility model provides the following solution: This utility model provides a pneumatic hoist with a main body and a limiting mechanism, including a pneumatic hoist body, and further comprising:
[0006] The mounting plate is fixed to the bottom of the pneumatic hoist body;
[0007] A limiting plate is disposed below the mounting plate. At least one limiting rod is fixed to each side of the bottom surface of the mounting plate. The limiting plate is elastically slidable on a plurality of the limiting rods in the vertical direction. A trigger alarm component is provided on the top of the limiting rod. The trigger alarm component is configured to trigger an alarm when it comes into contact with the limiting plate.
[0008] The sleeve has a through hole in the center of the limiting plate and is fixedly connected in the through hole. A chain is movably fitted at the center of the bottom end of the pneumatic hoist body. The bottom end of the chain passes through the mounting plate and is inserted into the sleeve. The chain slides in contact with the inner wall of the sleeve.
[0009] Preferably, a guide tube is fixedly connected to the bottom surface of the limiting plate, one end of the chain passing through the sleeve is inserted into the guide tube, an adapter is fixedly connected to the bottom end of the chain, a hook is rotatably connected to the bottom end of the adapter, and the diameter of the guide tube does not exceed the diameter of the adapter.
[0010] Preferably, the guide tube has a tapered structure, the bottom diameter of the guide tube is the same as the diameter of the adapter seat, and the top diameter of the guide tube is the same as the diameter of the sleeve.
[0011] Preferred options also include:
[0012] The locking block is fixed to the outer periphery of the top of the limiting rod;
[0013] A spring is wound around the limiting rod, and the two ends of the spring are respectively fixed to the adjacent sides of the limiting plate and the locking block;
[0014] A fixing block is fixed to the bottom end of the limiting rod. A limiting groove is formed on the limiting plate. The limiting rod slides in the limiting groove. The diameter of the limiting groove is smaller than the diameter of the fixing block and the locking block.
[0015] Preferably, the alarm triggering component includes:
[0016] A pressure signal meter is disposed on the bottom surface of the card block, and the projection of the spring along the vertical upward direction does not cover the pressure signal meter;
[0017] An alarm is fixedly attached to one side of the mounting plate, and the pressure signal instrument is communicatively connected to the alarm.
[0018] Preferably, the top end of the sleeve extends vertically upward, and the farthest distance between the top surface of the limiting plate and the pressure signal instrument is less than the farthest distance between the top end of the sleeve and the mounting plate.
[0019] Preferably, the mounting plate has an L-shaped structure, and both ends of the mounting plate are fixedly connected to the pneumatic hoist body.
[0020] Preferably, a reinforcing rod is fixedly connected between the top of the limiting rod and the mounting plate.
[0021] The present invention discloses the following technical effects:
[0022] This technical solution involves installing a mounting plate fixed to the bottom of the pneumatic hoist body, and simultaneously setting a limiting plate below the mounting plate. A limiting rod fixed to the mounting plate provides limiting support for the limiting plate, which is then elastically slidably attached to the limiting rod vertically. A chain passes through a sleeve on the limiting plate, allowing the chain to slide in contact with the sleeve, thus limiting the chain and effectively preventing lateral swaying when lifting heavy objects. Furthermore, as the chain lifts the heavy object, the sleeve's limiting effect on the chain obstructs the heavy object, causing the limiting plate to rise. The limiting plate can only slide along the limiting rod, effectively maintaining chain stability. When the limiting plate contacts the alarm trigger component, an alarm sounds, allowing personnel to promptly stop the pneumatic hoist body, achieving limit protection for the lifting height of heavy objects. Attached Figure Description
[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a front view of the structure of the pneumatic hoist body in this utility model;
[0025] Figure 2 This is a side view of the structure of the pneumatic hoist body in this utility model;
[0026] Figure 3 In this utility model Figure 1 A magnified view of a section at point A in the middle;
[0027] The components include: 1. Pneumatic hoist body; 2. Mounting plate; 3. Limiting plate; 4. Limiting rod; 5. Sleeve; 6. Chain; 7. Guide tube; 8. Adapter seat; 9. Hook; 10. Locking block; 11. Spring; 12. Fixing block; 13. Pressure signal instrument; 14. Alarm; 15. Reinforcing rod. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0030] Reference Figures 1-3 This utility model provides a pneumatic hoist with a limiting mechanism for the main body, including a pneumatic hoist body 1, and further comprising:
[0031] Mounting plate 2 is fixed to the bottom of pneumatic hoist body 1;
[0032] A limiting plate 3 is set below the mounting plate 2. At least one limiting rod 4 is fixed to each side of the bottom surface of the mounting plate 2. The limiting plate 3 is elastically slidable on several limiting rods 4 in the vertical direction. A trigger alarm component is set on the top of the limiting rod 4. The trigger alarm component is configured to alarm when it comes into contact with the limiting plate 3.
[0033] The sleeve 5 and the limiting plate 3 have a through hole in the center. The sleeve 5 is fixed in the through hole. The bottom center of the pneumatic hoist body 1 is movably fitted with a chain 6. The bottom end of the chain 6 passes through the mounting plate 2 and is inserted into the sleeve 5. The chain 6 slides in contact with the inner wall of the sleeve 5.
[0034] This technical solution involves installing a mounting plate 2 fixed to the bottom of the pneumatic hoist body 1, and simultaneously setting a limiting plate 3 below the mounting plate 2. A limiting rod 4 fixed to the mounting plate 2 provides limiting support for the limiting plate 3, and the limiting plate 3 is elastically slidably connected to the limiting rod 4 in the vertical direction. A chain 6 passes through a sleeve 5 on the limiting plate 3, allowing the chain 6 to slide in contact with the sleeve 5, thus limiting the chain 6 and effectively preventing lateral swaying when lifting heavy objects. Furthermore, as the chain 6 lifts the heavy object, the limiting effect of the sleeve 5 on the chain 6 prevents the sleeve from obstructing the heavy object, thereby causing the limiting plate 3 to rise. The limiting plate 3 can only slide along the limiting rod 4, effectively maintaining the stability of the chain 6. When the limiting plate 3 contacts the alarm trigger component, an alarm is triggered, allowing personnel to stop the pneumatic hoist body 1 in time, achieving limiting protection for the lifting height of heavy objects.
[0035] Furthermore, a guide tube 7 is fixedly connected to the bottom surface of the limiting plate 3, and one end of the chain 6 passing through the sleeve 5 is inserted into the guide tube 7. An adapter 8 is fixedly connected to the bottom end of the chain 6, and a hook 9 is rotatably connected to the bottom end of the adapter 8. The diameter of the guide tube 7 does not exceed the diameter of the adapter 8.
[0036] The guide tube 7 provides stable support for the chain 6, and the bottom end of the chain 6 is rotatably connected to the hook 9 through the adapter 8. The hook 9 fixes the heavy object. As the chain 6 is lifted, the guide tube 7 can block the adapter 8, ensuring that the heavy object and the limiting plate 3 are lifted, thereby monitoring and protecting the lifting height of the heavy object.
[0037] Furthermore, the guide tube 7 has a tapered structure, with the bottom diameter of the guide tube 7 being the same as the diameter of the adapter 8, and the top diameter of the guide tube 7 being the same as the diameter of the sleeve 5.
[0038] Specifically, the guide tube 7 is made of rubber. When the limit plate 3 comes into contact with the alarm triggering component, the limit plate 3 and the mounting plate 2 are relatively fixed. The rubber guide tube 7 can effectively buffer and protect the structure of the adapter 8 and the hook 9.
[0039] The tapered structure of the guide tube 7 transitions from the large diameter end to the small diameter end, and the small diameter end of the guide tube 7 is the same as the diameter of the sleeve 5. It can be understood that the inner diameter of the sleeve 5 is the same as the inner diameter of the small diameter end of the guide tube 7 and corresponds in the vertical direction. As the chain 6 is lifted, when the chain 6 passes through the guide tube 7 and extends into the sleeve 5, the transition is smooth and the movement stability is improved.
[0040] Furthermore, it also includes:
[0041] The locking block 10 is fixedly connected to the outer periphery of the top of the limiting rod 4;
[0042] Spring 11 is wound around the limiting rod 4, and the two ends of spring 11 are fixedly connected to the adjacent sides of the limiting plate 3 and the locking block 10, respectively.
[0043] The fixing block 12 is fixedly connected to the bottom end of the limiting rod 4. A limiting groove is opened on the limiting plate 3, and the limiting rod 4 slides in the limiting groove. The diameter of the limiting groove is smaller than the diameter of the fixing block 12 and the locking block 10.
[0044] The spring 11 provides elastic support to the limiting plate 3, maintaining the sliding stability between the limiting plate 3 and the limiting rod 4. The fixing block 12 and the locking block 10 limit the position below and below the limiting plate 3 respectively, preventing the limiting plate 3 from detaching from the limiting rod 4.
[0045] In this technical solution, although the elasticity of the spring 11 will decrease after long-term use, since the function of the spring 11 is only to provide elastic support for the limiting plate 3 to prevent the limiting plate 3 from sliding and jamming with the limiting rod 4, it can effectively support the long-term limiting protection function of the chain 6 and ensure the use effect.
[0046] Furthermore, the alarm triggering components include:
[0047] The pressure signal meter 13 is set on the bottom surface of the card block 10, and the spring 11 does not cover the pressure signal meter 13 along its vertical upward projection; this avoids the spring 11 from contacting the pressure signal meter 13 and affecting the pressure signal monitoring effect of the limit plate 3.
[0048] In one embodiment of this technical solution, the elastic force of the spring 11 is greater than the frictional force between the chain 6 and the sleeve 5 and the guide tube 7, so as to prevent the limiting plate 3 from being lifted due to sliding friction when the chain 6 passes through the sleeve 5 and the guide tube 7. Furthermore, the vibration of the spring 11 causes vibration transmission between the sleeve 5 and the chain 6, effectively preventing the chain 6 and the sleeve 5 from getting stuck.
[0049] In another embodiment of this technical solution, the bottom end of the pressure signal instrument 13 extends out of the locking block 10, and the extension length is greater than the limit compression length of the spring 11, ensuring that the limiting rod 4 and the pressure signal instrument 13 are in effective contact.
[0050] Alarm 14 is fixed to one side of mounting plate 2, and pressure signal meter 13 is connected to alarm 14.
[0051] The pressure signal transmitter 13 is connected to the alarm 14. When the pressure signal transmitter 13 receives the pressure signal transmitted by the limit plate 3, it can transmit the pressure signal to the external control center, and then the external control center transmits the signal to the alarm 14 to trigger an alarm. Alternatively, the pressure signal transmitter 13 can be directly coordinated with the pneumatic hoist control system. When the pressure signal transmitter 13 receives the pressure signal, it transmits the pressure signal to the pneumatic hoist control system, and the built-in coding calculation program of the pneumatic hoist control system performs calculations to close the pneumatic hoist body 1 and activate the alarm 14 to trigger an alarm, thereby enhancing the protection effect of the pneumatic hoist body 1. For the specific principle of the coordinated operation of the pressure signal and the pneumatic hoist control system, please refer to the patent number CN219384522U, "A Pneumatic Hoist with Limit Protection Function," which is existing technology and will not be described in detail here.
[0052] Furthermore, the top of the sleeve 5 extends vertically upward, and the farthest distance between the top surface of the limiting plate 3 and the pressure signal instrument 13 is less than the farthest distance between the top of the sleeve 5 and the mounting plate 2.
[0053] In this way, when the limit plate 3 is lifted by the heavy object, when the limit plate 3 comes into contact with the pressure signal instrument 13, it can prevent the sleeve 5 from coming into contact with the mounting plate 2 and causing structural damage. Furthermore, by extending the sleeve 5, the stability of the chain 6 during the winding and unwinding process can be improved.
[0054] Furthermore, the mounting plate 2 has an L-shaped structure, and both ends of the mounting plate 2 are fixedly connected to the pneumatic hoist body 1.
[0055] Based on the structural design of the pneumatic hoist body 1, the mounting plate 2 is welded and fixed to the outer shell of the pneumatic hoist body 1, so that the mounting plate 2 can remain horizontal, and improve the limiting and stabilizing effect on the chain 6 when the chain 6 passes through the mounting plate 2 and the limiting plate 3.
[0056] Furthermore, a reinforcing rod 15 is fixedly connected between the top of the limiting rod 4 and the mounting plate 2.
[0057] The support strength of the limiting rod 4 is increased by the fixed reinforcing rod 15.
[0058] This utility model provides a working principle for a pneumatic hoist with a limiting mechanism on the main body:
[0059] The heavy object is hoisted by the hook 9, and then the pneumatic motor on the pneumatic hoist body 1 is started to drive the sprocket to rotate and wind up the chain 6, thus lifting the heavy object. During the lifting process, the chain 6 passes through the sleeve 5, and the guide tube 7 and the sleeve 5 work together to stabilize the chain 6. When the adapter seat 8 contacts the limit plate 3, the limit plate 3 is lifted vertically. By continuously compressing the spring 11, when the limit plate 3 contacts the pressure signal instrument 13, the pressure signal instrument 13 transmits a pressure signal, which controls the alarm 14 through the external control center to generate an alarm, thereby achieving limit protection during the lifting process of the heavy object.
[0060] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "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 utility model 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 utility model.
[0061] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.
Claims
1. A body master band-limited pneumatic hoist comprising a pneumatic hoist body (1), characterized in that, Also includes: Mounting plate (2) is fixed to the bottom of the pneumatic hoist body (1); A limiting plate (3) is disposed below the mounting plate (2). At least one limiting rod (4) is fixedly connected to both sides of the bottom surface of the mounting plate (2). The limiting plate (3) is elastically slidably connected to a plurality of the limiting rods (4) in the vertical direction. A trigger alarm component is provided on the top of the limiting rod (4). The trigger alarm component is configured to alarm when it contacts the limiting plate (3). The sleeve (5) has a through hole in the center of the limiting plate (3), and the sleeve (5) is fixed in the through hole. The bottom center of the pneumatic hoist body (1) is movably fitted with a chain (6). The bottom end of the chain (6) passes through the mounting plate (2) and is inserted into the sleeve (5). The chain (6) slides in contact with the inner wall of the sleeve (5).
2. The pneumatic hoist with limiting mechanism as described in claim 1, characterized in that: The bottom surface of the limiting plate (3) is fixedly connected to a guide tube (7), one end of the chain (6) passing through the sleeve (5) is inserted into the guide tube (7), the bottom end of the chain (6) is fixedly connected to an adapter (8), the bottom end of the adapter (8) is rotatably connected to a hook (9), and the diameter of the guide tube (7) does not exceed the diameter of the adapter (8).
3. The pneumatic hoist with limiting mechanism as described in claim 2, characterized in that: The guide tube (7) has a tapered structure. The bottom diameter of the guide tube (7) is the same as the diameter of the adapter (8), and the top diameter of the guide tube (7) is the same as the diameter of the sleeve (5).
4. The pneumatic hoist with limiting mechanism as described in claim 1, characterized in that, Also includes: The locking block (10) is fixed to the outer periphery of the top of the limiting rod (4); A spring (11) is wound around the limiting rod (4), and the two ends of the spring (11) are respectively fixed to the adjacent sides of the limiting plate (3) and the locking block (10); A fixing block (12) is fixed to the bottom end of the limiting rod (4). A limiting groove is opened on the limiting plate (3). The limiting rod (4) slides in the limiting groove. The diameter of the limiting groove is smaller than the diameter of the fixing block (12) and the locking block (10).
5. The pneumatic hoist with limiting mechanism for the main body as described in claim 4, characterized in that, The alarm triggering component includes: A pressure signal meter (13) is disposed on the bottom surface of the card block (10), and the spring (11) does not cover the pressure signal meter (13) along its vertical upward projection. An alarm (14) is fixed to one side of the mounting plate (2), and the pressure signal instrument (13) is communicatively connected to the alarm (14).
6. The pneumatic hoist with limiting mechanism for the main body as described in claim 5, characterized in that: The top end of the sleeve (5) extends vertically upward, and the farthest distance between the top surface of the limiting plate (3) and the pressure signal instrument (13) is less than the farthest distance between the top end of the sleeve (5) and the mounting plate (2).
7. The pneumatic hoist with limiting function in the main body according to claim 1, characterized in that: The mounting plate (2) has an L-shaped structure, and both ends of the mounting plate (2) are fixedly connected to the pneumatic hoist body (1).
8. The pneumatic hoist with limiting function in the main body according to claim 1, characterized in that: A reinforcing rod (15) is fixedly connected between the top of the limiting rod (4) and the mounting plate (2).