A cross limiter for lifting equipment
By adopting arc-shaped part and limit ring structure in the cross limiter, combined with the adjustment handle and rack meshing mechanism, the problem of gradually decreasing the rotation angle of the cross limiter is solved, and the rotation timeliness and triggering of the cross limiter is improved Speed ensures accurate driving operation and work safety.
Patent Information
- Application Number
- CN202411282118.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2044-09-13
AI Technical Summary
The existing cross limiter gradually decreases during the process of the lever from the contact limit lever to the complete disengagement, affecting the triggering speed and causing delay in driving stopping.
A cross limiter for lifting equipment is designed, adopting arc-shaped part and limit ring structure, the arc of the arc gradually increases to contact the limit rod in advance, and combines the adjusting handle and rack meshing mechanism to ensure rotation. Timely triggering of timeliness and slowdown or shutdown commands.
It improves the rotational timeliness and triggering speed of the cross limiter, ensures accurate running and working safety of the driving, and reduces the aging delay caused by the smaller rotation angle.
Smart Images
Figure CN118790893B_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of cross limiters, and in particular to a cross limiter for lifting equipment. Background Art
[0002] The cross limiter is also called the travel limit switch, which is used to control the travel limit of the crane. In actual production, the travel limit switch is installed at a pre-arranged position. When the module on the moving part of the crane hits the travel switch, the contact of the travel limit switch moves to realize the switching of the circuit.
[0003] Patent document No. CN213011629U discloses a cross limiter for a vehicle, including a housing and a rotating wheel mechanism, wherein the rotating wheel mechanism is two levers in a cross-crossed state; Patent document No. CN216529658U discloses a cross limiter for a crane, wherein the housing and the rotating wheel mechanism are two levers in a cross-crossed state; Figure 1 It can be concluded that the wheel mechanism in the application is also two levers in a cross-shaped state. The cross limiters provided in the two patent documents have certain positive effects, but still have certain disadvantages. For example, in the process from the lever contacting the limit rod to the complete separation from the limit rod, assuming that the displacement of the process is evenly divided into several segments, the angle of rotation of the lever corresponding to any later displacement segment is smaller than the angle of rotation of the lever corresponding to any earlier displacement segment close to it. Although the lever in the traditional mechanism can always be rotated in the end, the smaller the angle rotation in the later displacement segment is, the triggering speed of the cross limiter will inevitably be affected to a certain extent. The triggering speed of the cross limiter is very important. For example, in order to compensate for the time error caused by the structure of the cross limiter itself to a certain extent in the prior art, a linkage mechanism of one-trigger deceleration-two-trigger parking is often set for some larger-sized vehicles (cars). Therefore, the earlier the cross limiter is triggered, the earlier the vehicle can be stopped. Summary of the invention
[0004] The purpose of the present application is to provide a cross limiter for lifting equipment in order to solve the above problems.
[0005] To achieve the above purpose, the technical solution of this application is:
[0006] A cross limiter for lifting equipment comprises a main body and a rotating wheel mechanism rotatably arranged on the main body, wherein the rotating wheel mechanism comprises two shifting rods in a cross-crossed state; an arcuate portion is provided on one side of the shifting rod facing away from the rotating direction of the rotating wheel mechanism, and the concave side of the arcuate portion faces away from the rotating direction of the rotating wheel mechanism; along the direction from the intersection center of the two shifting rods to the end of the shifting rod, the curvature of the arcuate portion gradually increases.
[0007] Preferably, the arc-shaped portion is an arc-shaped plate.
[0008] Preferably, a yield plane is provided on the outer circumferential wall of the lever, and the arc plate is arranged corresponding to the yield plane; a limiting ring is sleeved on the lever for making the arc plate close to the lever, and the limiting ring is jointly sleeved on the lever and the arc plate; an external thread is provided on the outer circumferential wall of the lever, and a limiting bolt is screwed on the lever for driving the limiting ring to move along the lever toward the end of the lever.
[0009] Preferably, an adjusting handle is screwed onto the shifting rod, the adjusting handle is located between the arc-shaped plate and the shifting rod, and push rods are screwed onto both ends of the adjusting handle.
[0010] Preferably, it also includes a mounting plate, on which a slide rail is provided, and a slide groove is provided on the side of the main body facing away from the rotating wheel mechanism, the slide groove is slidably matched with the slide rail, and the sliding direction of the main body relative to the slide rail is the same as the running direction of the vehicle.
[0011] Preferably, the rotating wheel mechanism includes a first wheel disc, a second wheel disc and a third wheel disc, the third wheel disc is located on the side of the second wheel disc facing away from the first wheel disc, and the second wheel disc is located on the side of the first wheel disc facing away from the main body; the two shifting rods are respectively arranged on the second wheel disc and the third wheel disc; a rotating ring is provided on the first wheel disc, a tooth groove is provided on the outer wall of the rotating ring, a rack is provided on the mounting plate, and the rack and the tooth groove are meshed with each other to drive the main body to slide relative to the mounting plate along the driving direction when the rotating wheel mechanism rotates.
[0012] Preferably, the rotating ring is connected to the first wheel disc via a connecting rod, the connecting rod is L-shaped, one end of the connecting rod is connected to the outer peripheral wall of the first wheel disc, and the other end of the connecting rod is connected to the inner wall of the rotating ring.
[0013] Preferably, the length of the rack is greater than or equal to the circumference of the rotating ring.
[0014] The present application discloses a cross limiter for lifting equipment, in which the concave side of the arc portion is used to directly contact the limit rod. Under the action of the arc portion, the arc portion that actually contacts the limit rod is always earlier than the point where the lever originally contacts the limit rod, thereby ensuring that the rotation angle does not gradually decrease and weaken the rotation time efficiency of the rotating wheel mechanism; at the same time, along the direction from the intersection center of the two levers to the end of the lever, the curvature of the arc portion gradually increases. In order to further increase the rotation time efficiency of the rotating wheel mechanism, the curvature of the arc portion gradually increases to compensate for the problem of the gradually decreasing relative angle between two adjacent positions, so that the lever triggers the deceleration or shutdown command within the shortest possible time efficiency at the moment of contacting the limit rod, so as to ensure the precise operation of the crane and the safety of work. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a simulation diagram of the trajectory of each position when the traditional cross limiter contacts the limit rod;
[0016] Figure 2 This is a schematic diagram of the overall structure of this application;
[0017] Figure 3 for Figure 2 A partial enlarged schematic diagram in the middle.
[0018] In the figure:
[0019] 10. Initial position; 100. First lever; 101. Second lever; 11. Position one; 12. Position two; 13. Position three; 14. Position four; 15. Position five; 2. Main body; 3. Lever; 30. Yield plane; 31. Limit bolt; 32. Limit ring; 4. Adjustment handle; 40. Push rod; 5. Arc plate; 6. Connecting rod; 7. Rotating ring; 70. Tooth groove; 8. Mounting plate; 80. Rack; 81. Slide rail; 9. Third wheel. DETAILED DESCRIPTION
[0020] The present application will now be described in further detail in conjunction with the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the present application in a schematic manner, and therefore only show the components related to the present application.
[0021] Please refer to Figure 1(the second lever 101 in position one 11, position two 12, position three 13, position four 14, position five 15 is not shown), which is a trajectory diagram of the rotating wheel mechanism mentioned in the background technology when it contacts the limit rod, showing a total of six positions, namely, initial position 10, position one 11, position two 12, position three 13, position four 14, and position five 15, and the horizontal distance between two adjacent positions is the same; at any position, the first lever 100 in the rotating wheel mechanism is always tangent to the outer wall of the limit rod; wherein the rotation angles of each position relative to the horizontal direction are: 65°, 46°, 34°, 26°, 21°, respectively; and the rotation angle of position two 12 relative to position one 11 is 19°, and the rotation angle of position three 13 relative to position two 12 is 12°, and the rotation angle of position four 14 relative to position three 13 is 8°, and the rotation angle of position five 15 relative to position four 14 is 5°.
[0022] Therefore, in order to avoid the phenomenon that the rotation angle of the rotating wheel mechanism gradually decreases within the same displacement section, the lever should approach the limit rod earlier than the original position; and because the relative rotation angle between two adjacent positions gradually decreases, the closer the lever 3 is to its own end, the greater the degree to which the lever approaches the limit rod earlier than the original position, so as to balance the trend of the relative angle decreasing.
[0023] For this reason, Figure 2-3 The present application provides a cross limiter for lifting equipment, including a main body 2 and a rotating wheel mechanism rotatably arranged on the main body 2, the rotating wheel mechanism including two levers 3 in a cross-crossed state; an arc portion is provided on the side of the lever 3 facing away from the rotation direction of the rotating wheel mechanism, and the concave side of the arc portion faces away from the rotation direction of the rotating wheel mechanism; along the direction from the intersection center of the two levers 3 to the end of the lever 3, the curvature of the arc portion gradually increases.
[0024] The internal structure of the main body 2 and the functional principle of the entire cross limiter are already common in the industry and are prior art, and will not be described in detail in this embodiment.
[0025] The concave side of the arc portion is used to directly contact the limit rod. Under the action of the arc portion, the arc portion that actually contacts the limit rod is always earlier than the point where the original lever 3 contacts the limit rod, thereby ensuring that the rotation angle does not gradually decrease and weaken the rotation timeliness of the rotating wheel mechanism; at the same time, along the direction of the intersection center of the two levers 3 pointing to the end of the lever 3, the curvature of the arc portion gradually increases. In order to further increase the rotation timeliness of the rotating wheel mechanism, the curvature of the arc portion gradually increases to compensate for the problem of the gradually decreasing relative angle between the two adjacent positions, so that the lever 3 triggers the deceleration or shutdown command within the shortest possible time when it contacts the limit rod, so as to ensure the accurate operation of the driving and the safety of the work.
[0026] In some further embodiments, the arc-shaped portion is an arc-shaped plate 5 .
[0027] The arc portion is an arc plate 5, which has a certain deformation ability under external force and has the ability to restore to its original state. Generally speaking, the arc plate 5 can be a steel sheet with a certain elasticity. However, it should be noted that because the rotating wheel mechanism has rotational properties, when the arc plate 5 contacts the limiting rod, the force of the limiting rod on the arc plate 5 will first cause the entire rotating wheel mechanism to rotate, rather than causing the arc plate 5 to deform.
[0028] In some further embodiments, a yield plane 30 is provided on the outer peripheral wall of the lever 3, and the arc plate 5 is arranged corresponding to the yield plane 30; a limiting ring 32 is sleeved on the lever 3 for making the arc plate 5 close to the lever 3, and the limiting ring 32 is jointly sleeved on the lever 3 and the arc plate 5; an external thread is provided on the outer peripheral wall of the lever 3, and a limiting bolt 31 is screwed on the lever 3 for driving the limiting ring 32 to move along the lever 3 toward the end of the lever 3.
[0029] The existence of the clearance plane 30 forms a clearance space between a section of the inner wall of the limit ring 32 and the clearance plane 30, so that when the limit ring 32 moves toward the end of the lever 3 under the action of the limit bolt 31, the arc plate 5 can be restrained in the clearance space, so that the arc plate 5 itself is deformed and fits on the lever 3, thereby changing the curvature of the arc plate 5.
[0030] In some further embodiments, an adjusting handle 4 is screwed onto the lever 3 , the adjusting handle 4 is located between the arc plate 5 and the lever 3 , and push rods 40 are screwed onto both ends of the adjusting handle 4 .
[0031] The adjusting handle 4 is threadedly connected to the lever 3, and can move on the lever 3 when rotating forward and backward; both ends of the adjusting handle 4 are threaded with push rods 40, and the push rods 40 can gradually extend out of the adjusting handle 4 during the rotation process, thereby pushing the convex side of the arc plate 5. Under the action of the limit bolt 31, the limit ring 32, the adjusting handle 4 and the push rod 40, the curvature of the arc plate 5 can be adjusted.
[0032] In addition, the lever 3, the arc plate 5 and the top rod 40 form a triangular structure, which can increase the strength of the entire rotating wheel mechanism to a certain extent, so that when the arc plate 5 touches the limit rod, the rotating wheel mechanism can be driven to rotate normally instead of bending or abnormally deforming to affect the command triggering time of the cross limiter.
[0033] In addition, Figure 3 As shown, there are two arc-shaped plates 5, which are symmetrically arranged on both sides of the lever 3, and two yielding planes 30 are also symmetrically arranged.
[0034] The symmetrical arrangement of the arc plate 5 and the yield plane 30 can not only ensure the flexibility of installation, but also serve as a trigger for bidirectional acceleration and deceleration instructions, that is, deceleration when rotating in one direction and acceleration when rotating in the other direction.
[0035] In some further embodiments, a mounting plate 8 is further included, on which a slide rail 81 is provided, and a slide groove is provided on the side of the main body 2 facing away from the rotating wheel mechanism, the slide groove and the slide rail 81 are slidably matched, and the sliding direction of the main body 2 relative to the slide rail 81 is the same as the running direction of the vehicle.
[0036] The mounting plate 8 is mounted on the side wall of the trolley (trolley), and the main body 2 can slide under the action of external force under the action of the slide groove and the slide rail 81.
[0037] In other embodiments, the sliding of the main body 2 and the mounting plate 8 can be achieved by using a guide rail set standard component, that is, a guide rail slider assembly.
[0038] In some further embodiments, the rotating wheel mechanism includes a first wheel disc, a second wheel disc and a third wheel disc 9, the third wheel disc 9 is located on the side of the second wheel disc facing away from the first wheel disc, and the second wheel disc is located on the side of the first wheel disc facing away from the main body 2; two levers 3 are respectively arranged on the second wheel disc and the third wheel disc 9; a rotating ring 7 is provided on the first wheel disc, a tooth groove 70 is provided on the outer wall of the rotating ring 7, and a rack 80 is provided on the mounting plate 8, and the rack 80 is meshed with the tooth groove 70 to drive the main body 2 to slide relative to the mounting plate 8 along the driving direction when the rotating wheel mechanism rotates.
[0039] Two mutually crossed levers 3 are respectively arranged on the second wheel disc and the third wheel disc 9. The first wheel disc is closer to the main body 2 than the second wheel disc and the third wheel disc 9 to prevent the limiting rod from interfering with the rotating ring 7 arranged on the first wheel disc.
[0040] The first wheel disc, the second wheel disc and the third wheel disc 9 rotate synchronously.
[0041] In some further embodiments, the rotating ring 7 is connected to the first wheel disc through a connecting rod 6, the connecting rod 6 is L-shaped, one end of the connecting rod 6 is connected to the outer wall of the first wheel disc, and the other end of the connecting rod 6 is connected to the inner wall of the rotating ring 7.
[0042] The rotating ring 7 is connected to the first wheel disc through an L-shaped connecting rod 6 , so that the rotating ring 7 goes over the thickness of the main body 2 to engage with the rack 80 on the mounting plate 8 .
[0043] The whole movement process is analyzed as follows:
[0044] Please also refer to Figure 2; The vehicle moves in one direction, specifically, the movement direction is set to the right. During the movement, the mounting plate 8 moves synchronously to the right together with the cross limiter. A limit rod is provided on the path it will pass through, and the limit rod is located below the cross limiter as a whole, that is, when actually contacted, an arc plate 5 on a lever 3 vertically located below and facing the limit rod contacts the limit rod; the end or a part of the limit rod is only used to contact the arc plate 5, and it itself is fixedly arranged. At the moment when the arc plate 5 contacts the limit rod, assuming that the main body 2 moves to the left relative to the mounting plate 8 under the interaction of the two, at the moment of moving to the left, due to the meshing action of the tooth groove 70 and the rack 80, the rotating ring 7 has a tendency to rotate counterclockwise relative to each other, that is, the first wheel plate, the second wheel plate, and the third wheel plate 9 have a tendency to rotate counterclockwise synchronously, that is, the arc plate 5 contacting the limit rod has a tendency to move toward the limit rod, but due to the fixation of the limit rod and the rightward movement of the entire mounting plate 8, the arc plate 5 cannot have a tendency to rotate counterclockwise, that is, interference is formed, so the assumption is not established, so at the moment when the arc plate 5 contacts the limit rod, the main body 2 cannot move relative to the mounting plate 8 does not move left, but (the interaction between the arc plate 5 and the limit rod) drives the entire first wheel disc, the second wheel disc, and the third wheel disc 9 to rotate clockwise. When the clockwise rotation occurs, the rotating ring 7 rolls rightward relative to the rack 80. Under the action of the tooth groove 70 and the rack 80, the main body 2 moves rightward relative to the mounting plate 8. That is to say, after the arc plate 5 contacts the limit rod, in addition to the whole mounting plate 8 and the cross limiter moving rightward together, the rotating ring 7 will also move rightward relative to the mounting plate 8, thereby speeding up the rotation of the first wheel disc, the second wheel disc, and the third wheel disc 9, that is, the command of the cross limiter is triggered in advance, so that the deceleration or shutdown command can be realized earlier, thereby ensuring safety.
[0045] The curvature setting of the arc plate 5 itself can compensate for the time delay problem caused by the gradually decreasing angle of the rotating wheel mechanism under the same displacement. At the same time, the rotation of the rotating wheel mechanism can link and drive the entire cross limiter to move further relative to the mounting plate 8 (fixedly installed on the vehicle) along the movement direction of the mounting plate 8, thereby accelerating the rapid rotation of the rotating wheel mechanism to further obtain a shorter command trigger time, thereby ensuring the timeliness of the trigger, ensuring the timeliness of the change in the vehicle's motion state, and correspondingly improving safety.
[0046] In some further embodiments, the length of the rack 80 is greater than or equal to the circumference of the rotating ring 7 .
[0047] In a traditional cross limiter, a quarter of the rotation angle can achieve a stop command. However, in some cross limiters, the first quarter of the rotation angle is used to trigger a deceleration command, and the second quarter of the rotation angle is used to trigger a stop command to ensure stability after the vehicle's motion state changes. In this embodiment, in order to meet the latter secondary shutdown requirements, the length of the rack 80 is set to be at least the length of the circumference of the rotating ring 7.
[0048] The above motion derivation process for the secondary shutdown is based on the fact that the rotating ring 7 is always in the middle of the rack 80. In actual situations, when the rack 80 is half the circumference of the rotating ring 7, it can also meet the usage requirements.
[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection created by this application.
Claims
1. A cross limiter for lifting equipment, characterized in that: The invention comprises a main body (2) and a rotating wheel mechanism rotatably arranged on the main body (2), wherein the rotating wheel mechanism comprises two shifting rods (3) in a cross-shaped state; arc-shaped portions are symmetrically provided on both sides of the shifting rods (3), wherein the arc-shaped portions are arc-shaped plates (5), and the concave sides of the arc-shaped plates (5) face away from the shifting rods (3); and the curvature of the arc-shaped portions gradually increases in a direction from the intersection center of the two shifting rods (3) to the ends of the shifting rods (3).
2. The cross limiter for lifting equipment according to claim 1, characterized in that: The outer peripheral wall of the lever (3) is provided with a clearance plane (30), and the arc plate (5) is arranged corresponding to the clearance plane (30); the lever (3) is sleeved with a limiting ring (32) for making the arc plate (5) close to the lever (3), and the limiting ring (32) is sleeved with the lever (3) and the arc plate (5); the outer peripheral wall of the lever (3) is provided with an external thread, and the lever (3) is screwed with a limiting bolt (31) for driving the limiting ring (32) to move along the lever (3) toward the end of the lever (3).
3. The cross limiter for lifting equipment according to claim 2, characterized in that: An adjusting handle (4) is screwed onto the shifting rod (3), the adjusting handle (4) is located between the arc-shaped plate (5) and the shifting rod (3), and push rods (40) are screwed onto both ends of the adjusting handle (4).
4. The cross stopper for lifting equipment according to claim 3, characterized in that: It also comprises a mounting plate (8), a slide rail (81) being provided on the mounting plate (8), a slide groove being provided on a side of the main body (2) facing away from the rotating wheel mechanism, the slide groove being in sliding cooperation with the slide rail (81), and a sliding direction of the main body (2) relative to the slide rail (81) being the same as a running direction of the vehicle.
5. The cross stopper for lifting equipment according to claim 4, characterized in that: The rotating wheel mechanism comprises a first wheel disc, a second wheel disc and a third wheel disc (9), wherein the third wheel disc (9) is located on a side of the second wheel disc facing away from the first wheel disc, and the second wheel disc is located on a side of the first wheel disc facing away from the main body (2); the two shifting rods (3) are respectively arranged on the second wheel disc and the third wheel disc (9); a rotating ring (7) is arranged on the first wheel disc, a tooth groove (70) is arranged on the outer wall of the rotating ring (7), and a rack (80) is arranged on the mounting plate (8), wherein the rack (80) and the tooth groove (70) are meshed with each other to drive the main body (2) to slide relative to the mounting plate (8) along the driving direction when the rotating wheel mechanism rotates.
6. The cross stopper for lifting equipment according to claim 5, characterized in that: The rotating ring (7) is connected to the first wheel disc via a connecting rod (6); the connecting rod (6) is L-shaped; one end of the connecting rod (6) is connected to the outer peripheral wall of the first wheel disc, and the other end of the connecting rod (6) is connected to the inner wall of the rotating ring (7).
7. The cross stopper for lifting equipment according to claim 6, characterized in that: The length of the rack (80) is greater than or equal to the circumference of the rotating ring (7).