360-degree dead-corner-free spring type stroke limiter

Abstract

The utility model discloses a 360-degree dead-corner-free spring type stroke limiter which comprises a shell, a movable sleeve is connected to the front end of the shell in a sliding mode, a universal assembly is arranged in the movable sleeve, a spring is connected to the front end of the universal assembly, a wire hole is formed in the right end of the shell, L-shaped fixing rods are conveniently fixed to the four corners of the upper end of the shell, and a stroke switch is fixed into the spring. The front end of the travel switch is connected with an ejector rod, the ejector rod is connected with a universal assembly, the universal assembly comprises a bell jar and a spherical sleeve, a plurality of arc-shaped grooves are formed in the inner wall of the bell jar along the circumference of the bell jar, the spherical sleeve is rotationally connected with a ball head of the bell jar through a spherical seat, and the spherical sleeve is rotationally connected with the bell jar through a retainer and steel balls. When the hoisting equipment hoists a heavy object and the heavy object swings, the spherical sleeve is rotatably connected in the bell jar and swings synchronously along with the driving direction of the heavy object, so that the spring is always perpendicular to the hook of the hoisting equipment, the hook uniformly extrudes the spring, and the accuracy of the stroke of the travel switch is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment limit, in particular to a 360-degree dead angle-free spring-type travel limiter. Background Art

[0002] In order to prevent the occurrence of top collision accidents in lifting equipment or the limit of lifting equipment during travel, most of them are completed by limit switches. At present, the existing anti-top collision limit devices on the market include pull rod limit type, heavy hammer limit type, photoelectric limit type, and the pallet limit type and top rod limit type that the applicant has applied for, etc. They all have the following disadvantages: for example, the photoelectric limit device, this kind of limit device is OK when it is installed at the beginning, but after a period of use, once the sensor sensing head is covered with dust, its sensitivity is significantly reduced, and malfunction or failure often occurs; another example is the pull rod type anti-top collision device, the length of its pull rod must be equal to the length of the wire rope drum, the higher the height of the starting equipment is raised, the longer the pull rod is, and the larger the volume of the wire rope drum is, which greatly increases the production cost, and the longer the pull rod is, the easier it is to be bent, resulting in limit failure, and the life safety of the operator cannot be guaranteed. Another example is the heavy hammer type, whose defect is that the stroke is too long, and it must be threaded and welded with an electric welder, which is very inconvenient during installation.

[0003] At the same time, when the lifting equipment is lifting heavy objects, most of the heavy objects do not rise vertically, but swing or shake to rise, and the existing limiter push rod cannot swing, resulting in uneven force on the spring when the hook is squeezed, resulting in a too short stroke, which makes it easy for the hoisted objects to not be restricted when rotating. Utility Model Content

[0004] In view of the above problems, the utility model provides a 360° spring-type travel limiter without dead angle, thereby solving the above problems.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a 360° dead angle-free spring-type travel limiter, comprising a housing, a movable sleeve is slidably connected to the front end of the housing, a universal assembly is arranged inside the movable sleeve, a spring is connected to the front end of the universal assembly, a wire hole is opened at the right end of the housing, an L-shaped fixing rod is conveniently fixed at the four corners of the upper end of the housing, a travel switch is fixed inside the spring, a push rod is connected to the front end of the travel switch, and the push rod is connected to the universal assembly;

[0006] The universal joint assembly includes a bell-shaped cover and a spherical sleeve, the inner wall of the bell-shaped cover is provided with a plurality of arc grooves along its circumference, a ball head is fixed inside the bell-shaped cover, a connecting rod fixedly connected to the push rod is fixed to the upper end of the bell-shaped cover, a spherical seat hinged to the ball head is provided inside the spherical sleeve, a plurality of placement grooves are provided on the outer wall of the spherical sleeve along its circumference, a connecting rod connected to a spring is fixed to the lower end of the spherical sleeve, a retaining frame is provided on the outer wall of the spherical sleeve, a plurality of through holes are provided on the outer wall of the retaining frame along its circumference, and steel balls are provided inside the through holes, and the steel balls are located between the placement grooves and the arc grooves.

[0007] Preferably, the spherical sleeve is rotatably connected to the ball head of the bell-shaped cover via a spherical seat, and the spherical sleeve is rotatably connected to the bell-shaped cover via a retaining frame and a steel ball.

[0008] Preferably, a flange is provided at the lower end of the connecting rod, a thread is opened at the lower end of the connecting rod, the connecting rod is connected to a nut through threaded engagement, a gasket is provided at the upper end of the nut, a connecting ring is bent at the upper end of the spring, the connecting ring is sleeved on the connecting rod and is located between the gasket and the flange.

[0009] Preferably, a hole is formed at the lower end of the connecting rod and an anti-dropping pin is inserted into the hole.

[0010] Preferably, the spring is conical in shape, with the diameter increasing from top to bottom.

[0011] Preferably, the arc grooves, through holes, steel balls and placement grooves are of the same number and at least three are provided.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The spherical sleeve is rotatably connected to the ball head of the bell-shaped cover through the spherical seat, and the spherical sleeve is rotatably connected to the bell-shaped cover through the retaining frame and the steel ball. When the lifting equipment lifts a heavy object and the heavy object swings, the spherical sleeve is rotatably connected in the bell-shaped cover and swings synchronously with the driving direction of the heavy object, so that the spring is always perpendicular to the hook of the lifting equipment, so that the hook evenly squeezes the spring to ensure the accuracy of the stroke of the travel switch.

[0014] 2. Due to the different connection methods between the hook and the hook body, the weight may drive the hook body to rotate when lifting heavy objects. The connecting ring and the connecting rod are connected by rotation to prevent the hook body from twisting the spring and changing the elastic force of the spring when it contacts the spring, thereby ensuring the accuracy of the travel switch stroke. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic cross-sectional view of the housing of the utility model;

[0017] Figure 3 It is a schematic diagram of the universal assembly of the utility model;

[0018] Figure 4 This is an exploded schematic diagram of the universal assembly of the utility model;

[0019] Figure 5 It is a cross-sectional schematic diagram of the universal joint assembly of the utility model;

[0020] Figure 6 For the utility model Figure 3 A is an enlarged schematic diagram.

[0021] Explanations in the figure: 1. Housing; 2. Universal assembly; 3. Spring; 4. Travel switch; 101. Wire hole; 102. Fixed rod; 103. Movable sleeve; 21. Bell cover; 22. Spherical sleeve; 23. Retaining frame; 24. Steel ball; 31. Connecting ring; 41. Push rod; 211. Connecting rod; 212. Arc groove; 213. Ball head; 221. Connecting rod; 222. Placement groove; 223. Spherical seat; 231. Through hole; 2211. Flange; 2212. Gasket; 2213. Nut; 2214. Anti-drop pin. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0023] See also Figure 1 , Figure 2 and Figure 3, a 360° spring-type travel limiter without dead angles, comprising a housing 1, wherein the four corners of the upper end of the housing 1 are conveniently fixed with an L-shaped fixing rod 102, the housing 1 is in the shape of a rectangular parallelepiped, the four corners of the upper end of the housing 1 are provided with holes and the fixing rods 102 are inserted into the holes, the upper end of the fixing rod 102 is connected with a bolt through a thread, and the fixing rod 102 is adjusted by twisting the bolt so that the fixing rod 102 is clamped and fixed to the lifting equipment, the front end of the housing 1 is slidably connected with a movable sleeve 103, a universal assembly 2 is arranged in the movable sleeve 103, the front end of the universal assembly 2 is connected with a spring 3, the spring 3 is a cone with a diameter that increases from top to bottom. The movable sleeve 103 is slidably connected to the outer shell 1. After the lifting equipment lifts the weight, the spring 3 is compressed, and the spring 3 slides against the movable sleeve 103, thereby squeezing the universal component 2, so that the travel switch 4 senses the travel, and then makes a judgment and action. A wire hole 101 is opened at the right end of the outer shell 1, and the travel switch 4 is fixed inside the spring 3. The front end of the travel switch 4 is connected to a push rod 41, and the push rod 41 is connected to the universal component 2. The wire hole 101 is used to pass the cable of the travel switch 4, which is convenient for arranging and passing the cable.

[0024] See also Figure 3 , Figure 4 and Figure 5The universal assembly 2 includes a bell-shaped housing 21 and a spherical sleeve 22. The inner wall of the bell-shaped housing 21 is provided with a plurality of arc grooves 212 along its circumference. A ball head 213 is fixed inside the bell-shaped housing 21. A connecting rod 211 fixedly connected to the top rod 41 is fixed on the upper end of the bell-shaped housing 21. A spherical seat 223 hinged to the ball head 213 is provided inside the spherical sleeve 22. The spherical sleeve 22 is rotatably connected to the ball head 213 of the bell-shaped housing 21 through the spherical seat 223. The spherical sleeve 22 is rotatably connected to the ball head 213 of the bell-shaped housing 21 by maintaining The frame 23 and the steel ball 24 are rotatably connected with the bell-shaped cover 21. When the lifting equipment lifts a heavy object and the heavy object swings, the spherical cover 22 is rotatably connected in the bell-shaped cover 21, and swings synchronously with the driving direction of the heavy object, so that the spring 3 is always perpendicular to the hook of the lifting equipment, so that the hook evenly squeezes the spring 3 to ensure the accuracy of the stroke of the travel switch 4. The outer wall of the spherical cover 22 is provided with a plurality of placement grooves 222 along its circumference, and a connecting rod connected to the spring 3 is fixed at the lower end of the spherical cover 22. 221, the outer wall of the spherical sleeve 22 is provided with a retainer 23, the outer wall of the retainer 23 is provided with a plurality of through holes 231 along its circumference, and a steel ball 24 is provided inside the through hole 231, the steel ball 24 is placed in the through hole 231 of the retainer 23 to prevent the steel ball 24 from escaping from the placement groove 222 of the spherical sleeve 22, the steel ball 24 is located between the placement groove 222 and the arc groove 212, the arc groove 212, the through hole 231, the steel ball 24 and the placement groove 222 are consistent in number and at least There are three of them. The spherical sleeve 22 is rotatably connected to the ball head 213 of the bell cover 21 through the spherical seat 223. The spherical sleeve 22 is rotatably connected to the bell cover 21 through the retaining frame 23 and the steel ball 24. Due to the different connection methods between the hook and the hook body, the weight will drive the hook body to rotate when lifting the weight. It is rotatably connected to the connecting rod 221 through the connecting ring 31 to prevent the hook body from twisting the spring 3 when contacting the spring 3 to change the elastic force of the spring 3, thereby ensuring the accuracy of the stroke of the travel switch 4.

[0025] See also Figure 3 and Figure 6The lower end of the connecting rod 221 is provided with a flange 2211, and the lower end of the connecting rod 221 is provided with a thread. The connecting rod 221 is connected to a nut 2213 through threaded engagement. The upper end of the nut 2213 is provided with a gasket 2212. The flange 2211 blocks the connecting ring 31. After the spring 3 is compressed, the connecting ring 31 moves upward against the flange 2211 to ensure that the travel switch 4 is accurately sensed. The gasket 2212 and the nut 2213 are provided at the lower end of the flange 2211 to prevent the connecting ring 31 from being moved from the flange 2211 and the gasket The spring 3 is disengaged from the sheets 2212, a connecting ring 31 is bent at the upper end of the spring 3, the connecting ring 31 is sleeved on the connecting rod 221 and is located between the gasket 2212 and the flange 2211, a hole is opened at the lower end of the connecting rod 221 and an anti-disengagement pin 2214 is inserted in the hole, the nut 2213 is threadedly engaged and connected to the connecting rod 221, the spring 3 is limited, and the connecting ring 31 is prevented from being disengaged from the connecting rod 221, and a hole is opened at the lower end of the connecting rod 221 and an anti-disengagement pin 2214 is installed in the hole to prevent the nut 2213 from being disengaged from the connecting rod 221.

[0026] When using this new model:

[0027] During installation, the device is fixed together with the stationary steel wire rope by four fixing rods 102; the spring 3 is then split apart and sleeved on the stationary steel wire rope; the upper end of the spring 3 is sleeved in the connecting rod 221 and the spring 3 is limited by the nut 2213 and the anti-drop pin 2214;

[0028] During operation: When the lifting equipment moves upward, when the hook body touches the lower edge of the spring 3, the spring 3 is compressed, and the normally closed point of the travel switch 4 is pushed open. At this time, the rising control signal is disconnected. Under the inertia of the rising operation, the hoisted objects and the hook body will continue to move upward, and part of the impact force generated will be absorbed by the spring 3, that is, the travel limit is completed.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. 360° no-dead-angle spring-type travel limiter, characterized by: The invention comprises a housing (1), the front end of the housing (1) is slidably connected to a movable sleeve (103), a universal assembly (2) is arranged inside the movable sleeve (103), the front end of the universal assembly (2) is connected to a spring (3), a wire hole (101) is opened at the right end of the housing (1), four corners of the upper end of the housing (1) are conveniently fixed with L-shaped fixing rods (102), a travel switch (4) is fixed inside the spring (3), the front end of the travel switch (4) is connected to a push rod (41), and the push rod (41) is connected to the universal assembly (2); The universal assembly (2) comprises a bell-shaped housing (21) and a spherical sleeve (22); the inner wall of the bell-shaped housing (21) is provided with a plurality of arc grooves (212) along its circumference; a ball head (213) is fixed inside the bell-shaped housing (21); a connecting rod (211) fixedly connected to a push rod (41) is fixed at the upper end of the bell-shaped housing (21); a spherical seat (223) hinged to the ball head (213) is provided inside the spherical sleeve (22); The outer wall of the spherical sleeve (22) is provided with a plurality of placement grooves (222) along its circumference, a connecting rod (221) connected to the spring (3) is fixed at the lower end of the spherical sleeve (22), a retaining frame (23) is provided on the outer wall of the spherical sleeve (22), a plurality of through holes (231) are provided on the outer wall of the retaining frame (23) along its circumference, and steel balls (24) are provided inside the through holes (231), and the steel balls (24) are located between the placement grooves (222) and the arc grooves (212).

2. The 360° no-dead-angle spring-type travel limiter according to claim 1, characterized in that: The spherical sleeve (22) is rotatably connected to the ball head (213) of the bell-shaped cover (21) via a spherical seat (223), and the spherical sleeve (22) is rotatably connected to the bell-shaped cover (21) via a retaining frame (23) and a steel ball (24).

3. The 360° no-dead-angle spring-type travel limiter according to claim 1, characterized in that: The lower end of the connecting rod (221) is provided with a flange (2211), the lower end of the connecting rod (221) is provided with a thread, the connecting rod (221) is connected to a nut (2213) through threaded engagement, the upper end of the nut (2213) is provided with a gasket (2212), the upper end of the spring (3) is bent with a connecting ring (31), the connecting ring (31) is sleeved on the connecting rod (221) and is located between the gasket (2212) and the flange (2211).

4. The 360° no-dead-angle spring-type travel limiter according to claim 1, characterized in that: A hole is formed at the lower end of the connecting rod (221) and an anti-drop pin (2214) is inserted into the hole.

5. The 360° no-dead-angle spring-type travel limiter according to claim 1, characterized in that: The spring (3) is conical in shape, and its diameter increases gradually from top to bottom.

6. The 360° no-dead-angle spring-type travel limiter according to claim 1, characterized in that: The arc-shaped grooves (212), through holes (231), steel balls (24) and placement grooves (222) are consistent in number and are at least three in number.

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