Automatic hoisting clamp

Abstract

The utility model provides an automatic hoisting clamp which comprises a hoisting rod and a movable three-branch connecting piece arranged outside the hoisting rod in a sleeving mode, a balance weight rod extending out of the lower end is arranged in the hoisting rod in a penetrating mode and fixedly connected with the movable three-branch connecting piece, a conical head is arranged at the upper end of the balance weight rod, and an elastically-connected limiting rod is further arranged on the hoisting rod in a penetrating mode. When the balance weight rod moves upwards relative to the hanging rod, the conical head can push away the limiting rod and is in lap joint with the limiting rod. According to the invention, unlocking and separation with the workpiece can be automatically realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of internal support clamps, and particularly relates to a hoisting automatic clamp. BACKGROUND

[0002] The internal support hoist is a common hoist for cylindrical workpieces, which usually comprises a lifting rod and three support arms arranged outside the lifting rod. When the lifting rod is subjected to upward force, the support arms will automatically expand outward under the action of gravity, thereby achieving the fixation of the workpiece inside. The conventional internal support hoist is usually provided with an unlocking mechanism. For example, the patent with the announcement number CN221191282U discloses an internal support hoist, which is provided with an unlocking pull finger ring. When unlocking, the worker needs to pull the unlocking pull finger ring to drive the movable three-way connecting piece to move upward along the lifting rod, and then drive the three support arms to shrink toward the lifting rod, so as to complete the separation of the hoist and the workpiece. However, the hoist and the workpiece cannot be automatically unlocked and separated. Therefore, the present application provides a hoisting automatic clamp. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a hoisting automatic clamp, which can automatically realize the unlocking and separation from the workpiece.

[0004] The technical scheme of the present application is as follows:

[0005] The present application provides a hoisting automatic clamp, which comprises a lifting rod and a movable three-way connecting piece sleeved outside the lifting rod. A counterweight rod protruding from the lower end is arranged in the inside of the lifting rod. The counterweight rod is fixedly connected with the movable three-way connecting piece. A conical head is arranged at the upper end of the counterweight rod. An elastically connected limiting rod is further arranged in the lifting rod. When the counterweight rod moves upward relative to the lifting rod, the conical head can push away the limiting rod and lap on the limiting rod.

[0006] According to the technical scheme of the present application, the lifting rod freely falls after losing the upward pulling force. After the counterweight rod contacts the ground, the counterweight rod moves upward relative to the lifting rod and drives the movable three-way connecting piece to move upward, so that the support arms move toward the lifting rod and are separated from the workpiece. After the conical head laps on the limiting rod, the shrinkage state of the support arms can be maintained, so that the clamp can be smoothly removed from the workpiece.

[0007] In some implementations, the counterweight rod is coaxially arranged with the lifting rod.

[0008] In some implementations, a pin column for connecting with the counterweight rod is screwed on the movable three-way connecting piece.

[0009] In some implementations, the pin column is arranged along the radial direction of the lifting rod.

[0010] In some implementations, the pin column is uniformly distributed along the circumferential direction of the movable three-way connecting piece.

[0011] In some implementations, the boom is provided with a sliding groove for passing through the pin post.

[0012] In some implementations, the sliding groove is parallel to the axis of the boom.

[0013] In some implementations, the outer wall of the boom is provided with a box for accommodating the limiting rod.

[0014] In some implementations, the limiting rod is provided with a push rod passing through the box.

[0015] In some implementations, the box is provided with a giving slot for passing through the push rod. BRIEF DESCRIPTION OF DRAWINGS

[0016] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the embodiments described below are only used to explain the present application, and are not intended to limit the scope of the present application. In the drawings:

[0017] Figure 1 is a schematic view of an existing inside support type lifting appliance;

[0018] Figure 2 is a schematic view of a lifting automatic clamp according to an embodiment of the present application;

[0019] Figure 3 is a schematic view of the installation of a counterweight rod according to an embodiment of the present application;

[0020] Figure 4 is a schematic view of a conical head lapping on a limiting rod according to an embodiment of the present application;

[0021] LIST OF REFERENCE NUMERALS

[0022] 1, boom; 11, sliding groove; 12, box; 13, limiting rod; 14, spring; 15, push rod; 16, giving slot;

[0023] 2, movable three-way connecting piece; 21, pin post;

[0024] 3, support arm; 31, fixed three-way connecting piece;

[0025] 4, connecting rod;

[0026] 5, adjusting rod;

[0027] 6, lifting ring;

[0028] 7, unlocking pull finger ring. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application.

[0030] In the related art, the internal support type lifting appliance is a common lifting appliance for cylindrical workpieces, which usually includes a lifting rod and three support arms arranged outside the lifting rod. When the lifting rod is subjected to upward force, the support arms will automatically expand outward under the action of gravity, thereby achieving the fixation of the workpiece inside. The conventional internal support type lifting appliance is usually also provided with an unlocking mechanism. For example, the patent with publication number CN221191282U discloses an internal support type lifting appliance, which is provided with an unlocking pull ring for unlocking. When unlocking, the worker needs to pull the unlocking pull ring to drive the movable three-way connecting piece to move upward along the lifting rod, thereby driving the three support arms to shrink toward the lifting rod, so as to complete the separation of the lifting appliance from the workpiece. However, the lifting appliance cannot realize automatic unlocking and separation from the workpiece.

[0031] Please refer to Figure 1 , the existing internal support type lifting appliance includes a lifting rod 1, a movable three-way connecting piece 2, a support arm 3, a connecting rod 4, an adjusting rod 5 and a lifting ring 6. The lifting ring 6 is fixedly connected to the top of the lifting rod 1 and is used to be connected with a lifting mechanism to apply upward tension to the lifting rod 1. The three support arms 3 are uniformly arranged outside the lifting rod 1 in the circumferential direction. Each support arm 3 is connected with a fixed three-way connecting piece 2 fixed on the lifting rod 1 through two connecting rods 4. The two connecting rods 4 are hinged between the support arm 3 and the fixed three-way connecting piece 2 and are parallel to each other, so that the support arm 3 remains parallel to the lifting rod 1. Under the action of gravity, the support arm 3 can expand outward in a posture always parallel to the lifting rod 1. The movable three-way connecting piece 2 is slidably sleeved outside the lifting rod 1, and the adjusting rod 5 is hinged between the movable three-way connecting piece 2 and the support arm 3. Through the movement of the movable three-way connecting piece 2 along the lifting rod 1, the support arm 3 can be expanded or shrunk through the adjusting rod 5.

[0032] When unlocking, the unlocking pull ring 7 fixed on the movable three-way connecting piece 2 drives the movable three-way connecting piece 2 to move upward along the lifting rod 1, thereby realizing the shrinkage of the support arm 3.

[0033] Since the support arm 3 needs to be manually controlled to shrink, the existing internal support type lifting appliance needs to ensure that there is enough space for the hand to contact the unlocking pull ring 7 when in use, which limits its scope of application.

[0034] The present embodiment provides a hoisting automatic clamp, which improves the structure of the existing internal support type lifting appliance as shown in Figure 1 , so that it can automatically realize unlocking and separation from the workpiece.

[0035] Please refer to Figures 2-4In the embodiment, the lifting automatic clamp comprises a lifting rod 1 and a movable three-way connecting piece 2 sleeved outside the lifting rod 1, a counterweight rod 30 protruding from the lower end is arranged in the lifting rod 1, the counterweight rod 30 is fixedly connected with the movable three-way connecting piece 2, a conical head 31 is arranged at the upper end of the counterweight rod 30, and a limiting rod 13 elastically connected with the lifting rod 1 is arranged on the lifting rod 1; when the counterweight rod 30 moves upward relative to the lifting rod 1, the conical head 31 can push away the limiting rod 13 and lap on the limiting rod 13.

[0036] According to the technical scheme, the lifting rod 1 freely falls after losing upward pulling force, the counterweight rod 30 moves upward relative to the lifting rod 1 after contacting the ground, the movable three-way connecting piece 2 moves upward, the support arm 3 moves to the lifting rod 1 and is separated from the workpiece, the conical head 31 laps on the limiting rod 13 after passing through the limiting rod 13, and the contraction state of the support arm 3 can be maintained, so that the clamp can be smoothly removed from the workpiece.

[0037] In the embodiment, the lower end of the counterweight rod 30 protrudes from the lower end of the lifting rod 1, the clamp freely falls in the workpiece after losing pulling force, the lower end of the counterweight rod 30 contacts the ground first, then the lifting rod 1 continues to fall, the counterweight rod 30 moves upward relative to the lifting rod 1, the movable three-way connecting piece 2 moves upward along the lifting rod 1, and the conical head 31 passes through and laps on the limiting rod 13.

[0038] When the movable three-way connecting piece 2 moves upward along the lifting rod 1, the support arm 3 is driven to move to the lifting rod 1 by the adjusting rod 5, that is, the contraction of the support arm 3 is realized, so that the clamp is unlocked from the workpiece and is separated from the workpiece.

[0039] It should be understood that the counterweight rod 30 is arranged in the lifting rod 1 and fixedly connected with the movable three-way connecting piece 2, the weight of the movable three-way connecting piece 2 can be increased, so that the support arm 3 can be more smoothly unfolded when clamping the workpiece.

[0040] In the embodiment, the counterweight rod 30 is coaxially arranged with the lifting rod 1, the lower end of the counterweight rod 30 protrudes from the lower end of the lifting rod 1, a plurality of sliding grooves 11 parallel to the axis of the lifting rod 1 are arranged on the side wall of the lifting rod 1, a pin column 21 for connecting with the counterweight rod 30 is screwed on the movable three-way connecting piece 2, the pin column 21 is screwed with the counterweight rod 30 after passing through the sliding groove 11, the pin column 21 can slide along the sliding groove 11, the pin column 21 and the sliding groove 11 are in one-to-one correspondence, the pin column 21 is arranged in the radial direction of the lifting rod 1, and the pin column 21 is uniformly distributed in the circumferential direction of the movable three-way connecting piece 2.

[0041] In addition, the outer wall of the boom 1 is fixedly connected with a box body 12, the box body 12 is internally provided with a limiting rod 13, a spring 14 is compressed between the box body 12 and the outer end of the limiting rod 13, the spring 14 retreats the limiting rod 13 into the inner cavity of the boom 1, the inner end surface of the limiting rod 13 is configured as a slope surface, when the conical head 31 moves upward, the conical head 31 will abut against the aforementioned slope surface and can push the limiting rod 13 outward, when the conical head 31 completely moves above the limiting rod 13, the lower end surface of the conical head 31 is overlapped on the top surface of the limiting rod 13, the top surface of the limiting rod 13 is a plane and is parallel to the lower end surface of the conical head 31.

[0042] In order to remove the blockage of the conical head 31, a push rod 15 is fixedly connected on the limiting rod 13, the push rod 15 extends to the outside of the box body 12 after passing through a gap slot 16 on the box body 12, by pulling the push rod 15, the push rod 15 loses the sliding ability along the gap slot 16, and can drive the limiting rod 13 to move outward, thereby removing the limitation of the conical head 31, so that the conical head 31 can move below the limiting rod 13.

[0043] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. An automatic lifting fixture, comprising a lifting rod and a movable three-pronged connector sleeved on the outside of the lifting rod, characterized in that: A counterweight rod extending from the lower end is passed through the interior of the boom, and the counterweight rod is fixedly connected to the movable three-pronged connector. A conical head is provided at the upper end of the counterweight rod, and an elastically connected limit rod is also passed through the boom. When the counterweight rod moves upward relative to the boom, the conical head can push the limit rod away and overlap the limit rod.

2. The automatic lifting fixture according to claim 1, characterized in that: The counterweight rod is coaxially arranged with the suspension rod.

3. The automatic lifting fixture according to claim 2, characterized in that: The movable three-pronged connector is screwed with a pin for connecting with the counterweight rod.

4. The automatic lifting fixture according to claim 3, characterized in that: The pins are arranged along the radial direction of the boom.

5. The automatic lifting fixture according to claim 4, characterized in that: The pins are evenly distributed along the circumference of the movable three-pronged connector.

6. The automatic hoisting fixture according to claim 5, characterized in that: The suspension rod is provided with a sliding groove for passing the pin.

7. The automatic hoisting fixture according to claim 6, characterized in that: The slide groove is parallel to the axis of the boom.

8. The automatic hoisting fixture according to claim 7, characterized in that: The outer wall of the suspension rod is provided with a box body for accommodating the limiting rod.

9. The automatic hoisting fixture according to claim 8, characterized in that: The limiting rod is provided with a shifting rod passing through the box body.

10. The automatic hoisting fixture according to claim 9, characterized in that: The box body is provided with a clearance slot for passing the shift rod.

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