Opening pulley
By incorporating the groove, locking block, and spring design in the limiting mechanism, the problem of the limiting block disengaging when the rope tension is insufficient or when the wind blows is solved, thus achieving stable locking of the flip plate and improving the safety and stability of the trolley.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-10
AI Technical Summary
When the existing open pulley has insufficient rope tension or is exposed to wind, the limit block and through hole may reach the unlock position, causing the flap to open automatically, the rope to detach, and affecting the stability and safety of the lifting operation.
A limiting mechanism was designed, including a slide, a locking block, and a spring. The locking block and the through hole cooperate to ensure that the pin and the limiting block do not disengage when the flip plate is in the unlocked position, thus keeping the flip plate closed. The elliptical limiting block and the through hole cooperate to prevent unlocking.
This improves the stability and safety of the open pulley, prevents the rope from coming loose during operation, and avoids serious consequences caused by the opening of the flap.
Smart Images
Figure CN223983369U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of pulley technology, and more specifically, to an open pulley. Background Technology
[0002] A lifting pulley is an important hoisting tool used in conjunction with lifting equipment, including open pulleys. An open pulley mainly consists of two spaced-apart and interconnected mounting plates; rollers are installed between the two mounting plates; a pin is rotatably fitted onto one mounting plate, and the pin is connected to a hanging ring that connects to the ground; a hinged flap is hinged to the other mounting plate, and the flap has a through hole through which the end of the pin passes. When the pin passes through the through hole, it forms a limiting range for the rope to pass through and for limiting the rope's movement. Existing open-end pulleys have an elliptical limit block at the end of the pin shaft, and the through hole of the flap is also elliptical. When the limit block coincides with the through hole, it is in the unlocked position; otherwise, it is locked. The pin shaft's hanging ring is connected to the ground. Before operation, the operator opens the flap, puts the rope into the limit area, and then closes the flap so that the limit block passes through the through hole. During operation, the open-end pulley components except for the hanging ring are pulled off the ground by the rope. After being fully tightened, the limit block and the through hole cannot reach the unlocked position, thus locking the flap and preventing the rope from falling off when the flap is opened.
[0003] However, when the lifting equipment is in operation, the operator needs to stay away from the open pulley to ensure that he or she can keep away from it. During the process of the open pulley leaving the ground, the operator cannot control the rotation angle of the hanging ring. When the tension of the rope on the pulley is insufficient or when there is wind, the limit block and the through hole may reach the unlock position. At this time, the flap will automatically open and the rope will be released, which will have a significant impact on the construction operation. Utility Model Content
[0004] This invention provides an open trolley that overcomes some or all of the defects of the prior art.
[0005] According to the present invention, an open trolley includes a body; the body has a first mounting plate, a second mounting plate and a roller that cooperate with each other; a hook part is provided between the first mounting plate and the second mounting plate, and the hook part includes a pin.
[0006] The second mounting plate includes a second mounting plate body and a flap hinged to the second mounting plate body. One end of the pin is rotatably engaged with the first mounting plate, and the other end of the pin is separably engaged with the flap.
[0007] The flap is provided with a through hole, and the other end of the pin is provided with a limiting part. The through hole and the limiting part together form a buckling mechanism. The buckling mechanism has an unlocking position, and the pin and the through hole are used for separation or assembly at the unlocking position.
[0008] A limiting mechanism is provided at the second mounting plate to prevent the pin and the through hole from separating at the unlocked position.
[0009] The limiting mechanism of this invention enables the pin and the limiting block to remain locked after passing through the through hole. Even if the rope tension is insufficient or the wind blows and the pin, the limiting block and the through hole are in the unlocked position, the pin and the limiting block will not disengage from the through hole, ensuring that the flap is always closed. Compared with the prior art, this open pulley is more stable and safer, preventing the rope from disengaging during construction operations and causing serious consequences and impacts.
[0010] Preferably, the limiting mechanism includes a slide groove located at the flap; the slide groove is located on the end face of the flap away from the first mounting plate and communicates with the inner side of the through hole; a locking block that can extend into the through hole is slidably fitted inside the slide groove; a cover plate for covering the slide groove is connected to the flap; the cover plate has a sliding opening that communicates with the slide groove; a slider connected to the locking block is slidably fitted at the sliding opening.
[0011] In this invention, by setting a locking block, a portion of the locking block can be inserted into the through hole. After a portion of the locking block is inserted into the through hole, the limiting block will be unable to pass through the through hole again due to the obstruction of the locking block, thus limiting the position of the limiting block.
[0012] Preferably, the slide is provided with a spring inside, which is used to give the block a tendency to extend into the through hole.
[0013] In this invention, the spring allows a portion of the locking block to be constantly pressed against the through hole, maintaining this state even when not manually operated.
[0014] Preferably, the end face of the second mounting plate body away from the first mounting plate is connected to a spaced-apart mounting seat, the flip plate is connected to a hinge block, and the hinge block is connected to a rotating shaft for rotating cooperation with the mounting seat.
[0015] In this invention, the mounting base and the hinge block are designed so that the hinge block can rotate with the mounting base via a pivot, thereby achieving the hinge connection between the flip plate and the main body of the second mounting plate.
[0016] Preferably, the limiting part includes a limiting block connected to the other end of the pin, the limiting block being used to engage with the through hole.
[0017] In this invention, the limiting block is designed to allow it to pass through the through hole, enabling the pin and the through hole to be separated or assembled.
[0018] Preferably, both the through hole and the limiting block are elliptical in shape.
[0019] In this invention, by setting the shape of the through hole and the limiting block, the elliptical limiting block and the elliptical through hole cannot reach the unlocking position after the open trolley is tightened by the rope, thereby limiting the flap.
[0020] Preferably, a connecting rod connects the first mounting plate and the main body of the second mounting plate.
[0021] In this invention, the first mounting plate and the second mounting plate are connected to each other by the connecting rod, so that the first mounting plate and the second mounting plate will not undergo relative displacement or rotation under the action of the roller and the connecting rod.
[0022] Preferably, the hook part also includes a hanging ring for connecting with the pin.
[0023] In this invention, the hanging ring allows the open pulley to connect to the ground, enabling it to perform common functions of a pulley, such as bearing loads and changing the direction of tension.
[0024] Preferably, each end face of the roller is connected to a connecting shaft, which rotatably engages with the main body of the first mounting plate and the second mounting plate, respectively.
[0025] In this invention, the connecting shaft allows the roller to rotate and engage with the first and second mounting plates, thereby cooperating with the rope. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the main body in Example 1;
[0027] Figure 2 This is a schematic diagram showing the alignment of the limiting block and the through hole in Example 1.
[0028] Figure 3 This is a schematic diagram of the flap after it is opened in Example 1;
[0029] Figure 4 This is a cross-sectional schematic diagram of the main body in Example 1;
[0030] Figure 5 for Figure 4 Enlarged diagram of point A in the diagram. Detailed Implementation
[0031] To further understand the content of this utility model, a detailed description of the utility model is provided in conjunction with the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the utility model.
[0032] Example 1
[0033] like Figure 1-5As shown, this embodiment provides an open trolley, which includes a body 100; the body 100 has a first mounting plate 110, a second mounting plate 120 and a roller 130 that cooperate with each other; a hook part 140 is provided between the first mounting plate 110 and the second mounting plate 120, and the hook part 140 includes a pin 141.
[0034] The second mounting plate 120 includes a second mounting plate body 121 and a flap 122 hinged to the second mounting plate body 121. One end of the pin 141 is rotatably engaged with the first mounting plate 110, and the other end of the pin 141 is separably engaged with the flap 122.
[0035] A through hole 326 is provided at the flap 122, and a limiting part 142 is provided at the other end of the pin 141. The through hole 326 and the limiting part 142 together form a latching mechanism 150. The latching mechanism 150 has an unlocking position, and the pin 141 and the through hole 326 are used to separate or assemble at the unlocking position.
[0036] A limiting mechanism 160 is provided at the second mounting plate 120. The limiting mechanism 160 is used to prevent the pin 141 and the through hole 326 from separating at the unlocked position.
[0037] The limiting mechanism 160 in this embodiment enables the pin 141 and the limiting block 1420 to remain locked after passing through the through hole 326. When the rope tension is insufficient or the wind blows and the pin 141, the limiting block 1420 and the through hole 326 are in the unlocked position, the pin 141 and the limiting block 1420 will not disengage from the through hole 326, ensuring that the flap 122 is always in the closed state. Compared with the prior art, this open trolley is more stable and safer, preventing the rope from disengaging during construction operations and causing more serious consequences and impacts.
[0038] in Figure 1With the lifting equipment rope passing through the open pulley, the hanging ring 143 is connected to the ground. The hanging ring 143, the first mounting plate 110, and the second mounting plate 120 are kept in a taut state. At this time, the length direction of the elliptical limiting block 1420 is not in the same direction as the length direction of the elliptical through hole 326, that is, they do not coincide. The limiting block 1420 cannot pass through the through hole 326, thus limiting the flap 122. It should be noted that since the flap 122 flips to allow the limiting block 1420 to pass through the through hole 326, the size of the through hole 326 must be larger than that of the limiting block 1420. The two are the same size and shape, but their size must be large enough to allow passage. The unlocking position mentioned in this article and the overlap of the limiting block 1420 and the through hole 326 refer to the overlap of the major or minor axis of their ellipse. Only when the two are overlapped can the limiting block 1420 pass through the through hole 326 and reach the unlocking position, allowing the flap 122 to separate. Otherwise, it is in a locked state, the flap 122 is always assembled, and the limiting block 1420 and the pin 141 cannot disengage from the through hole 326. The limiting block 1420 and the through hole 326 can also be teardrop-shaped, and the locking and unlocking principle is the same as that of the ellipse.
[0039] in Figure 2 After the lifting equipment operation is completed, the rope is lengthened so that the open pulley can be completely placed on the ground. The operator can then rotate the hanging ring 143 at a certain angle so that the limiting block 1420 can pass through the through hole 326 to open the flap 122.
[0040] in Figure 3 After the operator moves the slider 565 of the limiting mechanism 160 to fully insert the locking block 562 into the slide groove 561, the limiting block 1420 can pass through the through hole 326 to open the flap 122. In this state, the rope can be taken out from the limiting area.
[0041] In this embodiment, the limiting mechanism 160 includes a slide groove 561 provided at the flap 122; the slide groove 561 is located at one end face of the flap 122 away from the first mounting plate 110 and communicates with the inner side of the through hole 326; a locking block 562 that can extend into the through hole 326 is slidably fitted in the slide groove 561; a cover plate 568 for covering the slide groove 561 is connected to the flap 122; the cover plate 568 is provided with a sliding opening 563 that communicates with the slide groove 561; a slider 565 connected to the locking block 562 is slidably fitted at the sliding opening 563.
[0042] With the setting of the locking block 562 in this embodiment, a part of the locking block 562 can abut against the through hole 326. After a part of the locking block 562 extends into the through hole 326, the limiting block 1420 will be unable to pass through the through hole 326 again due to the obstruction of the locking block 562, that is, the limiting block 1420 plays a limiting role. Moreover, this structure only needs to slide the slider 565 to fully extend the locking block 562 into the slide groove 561 to release the limiting block 1420, which is more convenient to operate. The height of the locking block 562 can protrude beyond the flip plate 122. When it protrudes beyond the flip plate 122, the limiting block 1420 cannot coincide with the through hole 326. However, since the side wall of the limiting block 1420 is arc-shaped, there may be a situation where the locking block 562 is pushed and retracted into the slide groove 561. Therefore, the preferred solution is that the locking block 562 does not protrude beyond the flip plate 122. The stability is the highest when the locking block 562 does not interfere with the limiting block 1420.
[0043] In this embodiment, a spring 564 is provided inside the slide groove 561. The spring 564 is used to make the locking block 562 tend to extend into the through hole 326.
[0044] With the spring 564 provided in this embodiment, the spring 564 can keep a part of the locking block 562 pressed against the through hole 326 at all times, preventing the locking block 562 from dislodging from the through hole 326 and maintaining this state when not operated manually. The spring 564 can also be a component with elastic potential energy, such as a spring 564 sheet, to keep the locking block 562 pressed against the through hole 326.
[0045] In this embodiment, the end face of the second mounting plate body 121 away from the first mounting plate 110 is connected to a spaced mounting base 123, the flip plate 122 is connected to a hinge block 124, and the hinge block 124 is connected to a rotating shaft 125 for rotating cooperation with the mounting base 123.
[0046] With the mounting base 123 and hinge block 124 configured in this embodiment, the hinge block 124 can rotate with the mounting base 123 through the rotating shaft 125, thereby realizing the hinge between the flip plate 122 and the second mounting plate body 121.
[0047] In this embodiment, the limiting part 142 includes a limiting block 1420 connected to the other end of the pin 141, and the limiting block 1420 is used to cooperate with the through hole 326.
[0048] By setting the limiting block 1420 in this embodiment, the limiting block 1420 can pass through the through hole 326, so that the pin 141 and the through hole 326 can be separated or assembled through the limiting block 1420.
[0049] In this embodiment, both the through hole 326 and the limiting block 1420 are elliptical in shape.
[0050] By setting the shapes of the through hole 326 and the limiting block 1420 in this embodiment, after the open trolley is tightened by the rope, the elliptical limiting block 1420 and the elliptical through hole 326 cannot reach the unlocking position, thereby limiting the flap 122.
[0051] In this embodiment, a connecting rod 180 connects the first mounting plate 110 and the second mounting plate body 121.
[0052] By setting the connecting rod 180 in this embodiment, the first mounting plate 110 and the second mounting plate 120 are connected to each other, so that the first mounting plate 110 and the second mounting plate 120 will not undergo relative displacement or rotation under the action of the roller 130 and the connecting rod 180.
[0053] In this embodiment, the hook part 140 also includes a hook ring 143 for connecting with the pin 141.
[0054] By setting the hanging ring 143 in this embodiment, the open pulley can be connected to the ground, thereby enabling the open pulley to perform common functions of a pulley, such as bearing load and changing the direction of tension.
[0055] In this embodiment, connecting shafts 190 are connected to both ends of the roller 130, and are rotatably engaged with the first mounting plate 110 and the main body 121 of the second mounting plate, respectively.
[0056] The connection shaft 190 in this embodiment allows the roller 130 to rotate and engage with the first mounting plate 110 and the second mounting plate 120, thereby engaging with the rope.
[0057] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.
[0058] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited to this. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.
Claims
1. An open pulley, characterized by: The body (100) has a first mounting plate (110), a second mounting plate (120) and a roller (130) matched with each other; a hanging buckle part (140) is arranged between the first mounting plate (110) and the second mounting plate (120), and the hanging buckle part (140) comprises a pin shaft (141); The second mounting plate (120) comprises a second mounting plate body (121) and a turning plate (122) hinged to the second mounting plate body (121), one end of the pin shaft (141) is rotatably matched with the first mounting plate (110), and the other end of the pin shaft (141) is separably matched with the turning plate (122); The turning plate (122) is provided with a through hole (326), the other end of the pin shaft (141) is provided with a limiting part (142), and the through hole (326) and the limiting part (142) jointly form a buckle mechanism (150); the buckle mechanism (150) has an unlocking position, and the pin shaft (141) and the through hole (326) are used for being separated or assembled at the unlocking position; The second mounting plate (120) is provided with a limiting mechanism (160), and the limiting mechanism (160) is used for preventing the pin shaft (141) and the through hole (326) from being separated at the unlocking position.
2. An open pulley according to claim 1, wherein: The limiting mechanism (160) comprises a sliding groove (561) arranged at the turning plate (122); the sliding groove (561) is located at an end face of the turning plate (122) away from the first mounting plate (110) and penetrates the inner side of the through hole (326); a clamping block (562) capable of extending into the through hole (326) is slidably matched in the sliding groove (561); the turning plate (122) is connected with a cover plate (568) used for covering the sliding groove (561); the cover plate (568) is provided with a sliding opening (563) in communication with the sliding groove (561); a sliding block (565) connected with the clamping block (562) is slidably matched at the sliding opening (563).
3. An open pulley according to claim 2, wherein: The inner part of the sliding groove (561) is provided with a spring (564), and the spring (564) is used for enabling the clamping block (562) to have a tendency to extend into the through hole (326).
4. An open pulley as claimed in claim 1, wherein: The end face of the second mounting plate body (121) away from the first mounting plate (110) is connected with a mounting seat (123) arranged at intervals, the turning plate (122) is connected with a hinge block (124), and the hinge block (124) is connected with a rotating shaft (125) used for rotatably matching with the mounting seat (123).
5. An open pulley as claimed in claim 1, wherein: The limiting part (142) comprises a limiting block (1420) connected with the other end of the pin shaft (141), and the limiting block (1420) is used for matching with the through hole (326).
6. An open pulley according to claim 5, wherein: The shapes of the through hole (326) and the limiting block (1420) are both oval.
7. An open pulley as claimed in claim 1, wherein: The first mounting plate (110) and the second mounting plate body (121) are connected with a connecting rod (180).
8. An open pulley as claimed in claim 1, wherein: The hanging buckle part (140) further comprises a hanging ring (143) used for connecting with the pin shaft (141).
9. An open pulley as claimed in claim 1, wherein: The roller (130) is connected with a connecting shaft (190) at both end faces and rotatably matches with the first mounting plate (110) and the second mounting plate body (121) respectively.