Chain elevator with chain protection structure

Abstract

The utility model provides a chain elevator with a chain protection structure, which comprises a driving chain wheel, a stand column, a chain, a sliding block and a fork frame, the sliding block is in transmission fit with the chain, the fork frame is connected with the sliding block, and the chain is connected with the sliding block; the chain protection structure comprises an installation support connected with the sliding block, a sliding rod, a spring arranged on the sliding rod in a sleeving mode and a connecting plate connected with the end of the chain, the sliding rod is connected with the connecting plate, and the spring directly or indirectly abuts against the connecting plate so that the chain located between the driving chain wheel and the connecting plate can be kept tight. The protection structure of the device is simple and ingenious, the resilience force of the compression spring drives the connecting plate to keep the displacement trend, when the chain is loosened, the spring drives the connecting plate to move so as to enable the chain connected with the sliding block to be in a tightened state all the time, and tooth skipping is prevented.

Description

Technical Field

[0001] The utility model relates to the field of material transportation equipment, in particular to a chain hoist with a chain protection structure. Background Art

[0002] Chain hoist is a commonly used lifting machine. Its general structure is as follows: Figure 1 As shown, it is mainly composed of a driving sprocket 1, a guide wheel 2, a column 3, a chain 4, a driven sprocket 5, a slider 6 and a fork frame 7. Rollers are installed on both sides of the slider 6, which can roll in the slide groove of the column 3; the fork frame 7 is connected to the slider 6, and the upper and lower ends of the slider 6 are respectively connected to the chain 4, and the load is placed on the fork frame 7.

[0003] When the power drives the active sprocket 1 to rotate counterclockwise, the chain 4 drives the slider 6 and the fork frame 7 to lift upward, and vice versa. Regardless of lifting or lowering, the chain at b is always taut under the action of the load, the slider 6 and the gravity of the fork frame 7. The chain at a is in a tensioned state when it leaves the factory. With long-term use, it will gradually stretch and become loose, which will make the active sprocket 1 prone to tooth skipping, posing a safety hazard. This is a common problem of chain hoists. In addition, when human negligence causes an object to appear under the fork frame, if the fork frame 7 continues to descend at this time, the fork frame 7 will be blocked by the object, and the active sprocket 1 will continue to rotate clockwise under the power to continuously tighten the chain at a, causing the chain to break or be damaged by power overload, which also poses a safety hazard. Finally, after the chain hoist has been running for a long time, the chain is seriously worn, but there is no clear signal to prompt the replacement of the chain. The operator can only rely on experience to judge whether it needs to be replaced or repaired, or mechanically stipulate a fixed period to replace the chain. However, considering that the actual use conditions vary greatly, some heavy loads and frequent use conditions will cause much more serious wear than expected, which is easy to cause safety hazards. Therefore, the inventors designed a chain connection structure that provides multiple safety protections to effectively solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a chain hoist with a chain protection structure. The technical solutions adopted by this utility model are as follows:

[0005] A chain hoist with a chain protection structure, the chain hoist comprises: a driving sprocket, a guide wheel, a column, a chain, a passive sprocket, a slider matched with the chain transmission, and a fork frame connected to the slider, the chain is connected to the slider, the driving sprocket and the passive sprocket transmission cooperate to drive the chain, the slider and the fork frame; a chain protection structure is arranged between the slider and the chain, the chain protection structure comprises: a mounting bracket connected to the slider, a slide bar, a spring sleeved on the slide bar and limited in the mounting bracket, and a connecting plate connected to the end of the chain,

[0006] The slide bar is connected to the connecting plate, and the spring directly or indirectly pushes the connecting plate to keep the chain between the driving sprocket and the connecting plate taut, which can ensure that the chain at a is kept taut to avoid tooth skipping.

[0007] Preferably, the slide rod includes a first limiting section and a second limiting section, and the diameter of the first limiting section is larger than the diameter of the second limiting section, so that the first limiting section compresses and limits the spring sleeved outside the second limiting section.

[0008] Preferably, the connecting plate is connected to the first limiting section of the sliding rod.

[0009] Preferably, the mounting bracket has a cylindrical structure for limiting the circumferential position of the slide rod and the axial position of the spring, and the first limiting section of the slide rod can slide relative to the mounting bracket and the slide block.

[0010] Another implementation is: the sliding rod includes a first limiting section and a second limiting section, and the diameter of the first limiting section is larger than the diameter of the second limiting section, the first limiting section can be slidably sleeved outside the second limiting section, the second limiting section is fixedly connected to the mounting bracket, and the first limiting section compresses the spring sleeved outside the second limiting section and limits it.

[0011] Preferably, a chain connecting portion, such as a hard connecting rod, is extended from the end of the chain, and the chain connecting portion is connected to a connecting plate, and the connecting plate is connected to the top end of the first limiting section of the sliding rod.

[0012] Preferably, a detection bracket is installed on one side of the connecting plate, and a proximity detection switch cooperating with the detection bracket is arranged on the sliding block, and the detection bracket detects the position change of the proximity detection switch; one implementation mode is: the detection bracket includes a first bend and a second bend arranged at a certain distance, and the proximity detection switch is located between the sensing intervals of the first bend and the second bend; when the spring rebounds to the minimum compression amount (the minimum compression amount means: in this compressed state, the spring can no longer push the connecting plate to drive the chain to move upward), the proximity detection switch detects the second bend and sends out an alarm signal and stops the operation of the hoist; when the spring is compressed to the point that the proximity detection switch detects the first bend, the proximity detection switch sends out an alarm signal and stops the operation of the hoist.

[0013] The beneficial effects of the utility model are as follows: the protective structure of the device is simple and ingenious, the resilience of the compression spring drives the connecting plate to maintain the displacement trend, when the chain is loose, the spring drives the connecting plate to move to always keep the chain connected to the slider in a taut state to prevent tooth jumping;

[0014] In addition, when the chain is severely worn, it can be detected by the detection switch, prompting the chain to be replaced; when the fork frame is blocked during the descent process, it can also be detected by the detection switch in time to prevent chain collapse or power damage

[0015] Finally, the protective structure is modular and extensible, and any chain lifting structure can be installed and used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0017] Figure 1 It is a schematic diagram of the existing structure in the background technology;

[0018] Figure 2 This is a structural schematic diagram of Example 1;

[0019] Figure 3 for Figure 2 Enlarged image at c in the middle;

[0020] Figure 4 It is a side view of the chain protection structure of Example 1;

[0021] Figure 5 It is a front view of the chain protection structure of Example 1;

[0022] Figure 6 It is a top view of the chain protection structure of Example 1;

[0023] In the figure, 1-driving sprocket, 11-mounting bracket, 12-spring, 13-slide rod, 131-first limiting section, 132-second limiting section, 14-chain connecting part, 15-connecting plate, 16-detection switch, 17-detection bracket, 171-first bend, 172-second bend, 2-guide wheel, 3-column, 4-chain, 5-passive sprocket, 6-slider, 7-fork frame. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0025] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0026] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0027] Example 1

[0028] Reference Figure 2-6 A chain hoist with a chain protection structure, the hoist is composed of a driving sprocket 1, a guide wheel 2, a column 3, a chain 4, a driven sprocket 5, a slider 6 and a fork frame 7. The slider 6 is equipped with rollers on both sides, which can roll in the slide groove of the column 3; the fork frame 7 is connected to the slider 6, and the upper and lower ends of the slider 6 are respectively connected to the chain 4, and the load is placed on the fork frame 7; when the power drives the driving sprocket 1 to rotate counterclockwise, the chain 4 drives the slider 6 and the fork frame 7 to lift upward, and vice versa, the slider 6 and the fork frame 7 are lowered; regardless of lifting or lowering, the chain at b is always taut under the action of the gravity of the load, the slider 6 and the fork frame 7.

[0029] The chain protection structure is installed at position c on the chain hoist ( Figure 3 ), the protective structure is fixed on the slider 6, and the chain 4 is connected to the slider 6 through the driving sprocket 1; the detailed structure of the chain connection structure is as follows Figure 3 As shown, it mainly includes: a mounting bracket 11, a spring 12, a sliding rod 13, a chain connecting rod 14, a connecting plate 15, a proximity detection switch 16 and a detection bracket 17.

[0030] The mounting bracket 11 is fixed on the slider 6, and a spring 12 is installed in the round tube of the mounting bracket 11 and the bottom end of the spring 12 is positioned. The slide bar 13 can slide up and down in the round tube of the mounting bracket 11, and the second limiting section 132 with a smaller diameter at the lower end of the slide bar 13 passes through the spring 12, and the shoulder is pressed on the upper end surface of the spring 12; the connecting plate 15 is fixed on the top of the slide bar 13, and one end of the connecting plate 15 is connected to the chain connecting rod 14, and the chain connecting rod 14 is connected to the chain below; the detection bracket 17 is installed on one side of the connecting plate 15, and the detection bracket 17 has a first bend 171 and a second bend 172 above and below, and the proximity detection switch 16 is fixed on the slider 6 and cooperates with the detection bracket 17.

[0031] When the hoist is working, the spring 12 of the protective structure is in a compressed state, providing an upward thrust, which is transmitted through the slide bar 13, the connecting plate 15 and the chain connecting part (rod) 14, and acts on the chain 4, so that the chain is always in a taut state. Even if the chain wear length increases, as long as the compression of the spring is not less than the preset minimum value, the chain at point a will always be in a taut state, so that the chain 4 will not jump teeth.

[0032] As the chain gradually relaxes and stretches due to wear, the slide bar 13 (first limit section 131) will continue to slide upward due to the rebound effect of the spring 13, thereby driving the connecting plate 15 and the detection bracket 17 to move upward continuously, so that the second bend 172 of the detection bracket 17 gradually approaches the proximity detection switch 16; when the compression of the spring reaches the designed minimum value, the proximity detection switch 16 detects the second bend 172, and the equipment stops and alarms, indicating that the chain is severely worn and needs to be replaced.

[0033] During the descent of the fork frame 7, if an object appears under the fork frame 7 and blocks the fork frame 7 from moving downward, the chain 4 is still pulled downward by the clockwise rotation of the active sprocket 1. At this time, the chain section a drives the connecting plate 15 and the slide rod 13 to slide downward to compress the spring 12. The downward movement of the first bend 171 of the detection bracket 17 is detected by the proximity detection switch 16. At this time, the equipment stops and an alarm is sounded, indicating that the descent is blocked.

[0034] Example 2

[0035] The difference between Example 2 and Example 1 is that the first limiting section 131 of the sliding rod 13 can be slidably sleeved outside the second limiting section 132, the second limiting section 132 is fixedly connected to the mounting bracket, and the first limiting section 131 is sleeved outside the second limiting section to compress the spring and limit it.

[0036] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A chain hoist with a chain protection structure, the chain hoist comprising: A driving sprocket (1), a column (3), a chain (4), a slider (6) for transmission cooperation with the chain (4), and a fork frame (7) connected to the slider (6), wherein the chain (4) is connected to the slider (6); characterized in that a chain protection structure is arranged between the slider (6) and the chain (4), and the chain protection structure comprises: a mounting bracket (11) connected to the slider (6), a slide bar (13), a compression spring (12) located in the mounting bracket (11) and sleeved on the slide bar (13), and a connecting plate (15) connected to the end of the chain, wherein the slide bar (13) is connected to the connecting plate (15), and the compression spring (12) directly or indirectly pushes the connecting plate (15) to keep the chain (4) between the driving sprocket (1) and the connecting plate (15) taut.

2. The chain hoist with chain protection structure according to claim 1, characterized in that: The sliding rod (13) comprises a first limiting section (131) and a second limiting section (132), and the diameter of the first limiting section (131) is greater than the diameter of the second limiting section (132), so that the first limiting section (131) compresses and limits the spring sleeved outside the second limiting section (132).

3. The chain hoist with chain protection structure according to claim 2, characterized in that: The connecting plate (15) is connected to the first limiting section (131) of the sliding rod (13).

4. The chain hoist with chain protection structure according to claim 2, characterized in that: The first limiting section (131) can be slidably sleeved outside the second limiting section (132), the second limiting section (132) is fixedly connected to the mounting bracket (11), and the first limiting section (131) compresses the spring sleeved outside the second limiting section (132) and limits it.

5. The chain hoist with chain protection structure according to claim 2, characterized in that: The mounting bracket (11) has a cylindrical structure for limiting the circumferential position of the slide rod (13) and the axial position of the spring. The first limiting section (131) of the slide rod (13) can slide relative to the mounting bracket (11) and the slide block (6).

6. The chain hoist with chain protection structure according to claim 2 or 4, characterized in that: A chain connecting portion (14) is extended from the end of the chain (4), and the chain connecting portion (14) is connected to a connecting plate (15), and the connecting plate (15) is connected to the top of the first limiting section (131) of the sliding rod (13).

7. The chain hoist with chain protection structure according to claim 1, characterized in that: A detection bracket (17) is installed on one side of the connecting plate (15), and a proximity detection switch (16) cooperating with the detection bracket (17) is arranged on the slider (6), and the detection bracket (17) detects the position change of the proximity detection switch (16).

8. The chain hoist with chain protection structure according to claim 7, characterized in that: The detection bracket (17) comprises a first bend (171) and a second bend (172) which are arranged at a distance from each other, and the proximity detection switch (16) is located between the sensing intervals of the first bend (171) and the second bend (172).

9. The chain hoist with chain protection structure according to claim 8, characterized in that: When the spring (12) rebounds to the minimum compression amount, the proximity detection switch (16) detects the second bend (172) and sends out an alarm signal.

10. The chain hoist with chain protection structure according to claim 8, characterized in that: When the spring (12) is compressed to the point where the proximity detection switch (16) detects the first bend (171), the proximity detection switch (16) sends out an alarm signal.

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