Hoisting clamp with bidirectional self-locking function

Abstract

The hoisting clamp comprises two sets of four-connecting-rod clamps A and B which are connected side by side in a mirroring mode through a plurality of pin shafts, and two sets of ratchet wheel self-locking mechanisms C and D are installed between the two sets of four-connecting-rod clamps and are responsible for self-locking when clamping rods of the two sets of four-connecting-rod clamps are opened and clamped; a rotating shaft is movably arranged between the two sets of four-connecting-rod clamp clamping rods; the ratchet wheel self-locking mechanism comprises a ratchet wheel, a stop pawl and a spring pressing sheet; the ratchet wheel is mounted on a pin shaft in the middle of a second clamping rod A and a second clamping rod B of the two sets of four-connecting-rod clamps; the stop pawl is fixedly mounted on a rotating shaft and is matched with the ratchet wheel to realize locking action; the spring pressing sheet is fixedly mounted on the inner side of a first clamping rod and is used for pressing the stop pawl on ratchets of the ratchet wheel; the tooth directions of the two ratchet wheels of the two ratchet wheel self-locking mechanisms are opposite. The shaft part hoisting device is simple in structure, convenient to operate, high in hoisting efficiency and high in safety, hoisting and mounting work of shaft parts is facilitated, and the mounting efficiency and the operation safety are improved.

Description

Technical Field

[0001] The invention relates to a hoisting clamp with bidirectional self-locking function, belonging to the technical field of hoisting equipment. Background Art

[0002] When assembling the whole vehicle, the thrust rod needs to be lifted from the storage tooling to the installation position of the whole vehicle. The traditional lifting method is to use a lifting belt, which has low lifting efficiency and potential safety hazards. For the lifting of shaft parts, the existing connecting rod type lifting fixture generally uses a connecting rod structure and relies on the deadweight of the hanging parts to achieve the purpose of self-locking clamping of the hanging parts. However, when clamping the hanging parts, the fixture needs to be separated first. If the weight of the fixture itself is large, the operation is more difficult. Generally, the clamp needs to be opened with the assistance of an additional auxiliary mechanism. The operation is more complicated and the lifting efficiency is low. In addition, a locking mechanism needs to be set to lock the clamping position of the clamp to avoid accidental loosening of the clamp after lifting to cause safety accidents.

[0003] Therefore, in order to ensure that the thrust rod can be hoisted efficiently and safely, a hoisting clamp with two-way self-locking is urgently needed, which can achieve self-locking during the opening and closing process of the clamp, thereby facilitating the hoisting and installation of the thrust rod. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a lifting clamp with two-way self-locking that has a simple structure, is easy to operate, has high lifting efficiency and high safety, so as to facilitate the lifting and installation of the thrust rod and improve the installation efficiency and operation safety.

[0005] The object of the present invention is achieved in that: A lifting fixture with bidirectional self-locking, comprising two sets of four-linkage clamps A and B connected in parallel and in mirror image through a plurality of pins, the four-linkage clamp comprising a first connecting rod and a second connecting rod hinged at one end through a pin, a first clamping rod and a second clamping rod hinged at the middle through a pin, the lower end of the first connecting rod is hinged to the upper end of the first clamping rod through a pin, and the lower end of the second connecting rod is hinged to the upper end of the second clamping rod through a pin; Two sets of ratchet self-locking mechanisms C and D are installed between the two sets of four-bar clamps, which are responsible for the self-locking of the first clamping rod and the second clamping rod when opening and clamping respectively; a rotating shaft is movably arranged between the first clamping rod A and the first clamping rod B of the two sets of four-bar clamps; The ratchet self-locking mechanism comprises a ratchet mounted on the pin shaft in the middle of the second clamping rod A and the second clamping rod B of the two sets of four-bar clamps, a stop pawl fixed on the rotating shaft and cooperating with the ratchet to achieve locking action, and a spring pressing piece fixed on the inner side of the first clamping rod for pressing the stop pawl on the ratchet teeth of the ratchet; the teeth of the two ratchet wheels of the two ratchet self-locking mechanisms are opposite; The distance between the two stop pawls of the two sets of ratchet self-locking mechanisms on the rotating shaft is greater than the distance between the two ratchets, ensuring that the two stop pawls cannot contact the two ratchets at the same time.

[0006] Furthermore, a transverse extension rod is provided on the side of the free end of the stopping pawl, and the spring pressing sheet presses the extension rod to press the stopping pawl onto the ratchet teeth of the ratchet wheel.

[0007] Furthermore, the first clamping rod is provided with an arc-shaped waist hole, which provides the extension rod with a movable space when following the rotating shaft and the stop pawl to perform axial movement and rotation.

[0008] Furthermore, limit blocks are provided at the two ends of the rotating shaft located outside the first clamping rod to limit the axial movement distance of the rotating shaft.

[0009] Furthermore, the difference between the spacing between the two stopping pawls and the spacing between the two ratchet wheels is equal to the axial movement distance of the rotating shaft.

[0010] Furthermore, rollers are provided between the hook-shaped clamping parts of the two sets of first clamping rods and between the hook-shaped clamping parts of the two sets of second clamping rods. The rollers are in contact with the hoisted workpiece, so that the workpiece can rotate around its own axis during hoisting, thereby facilitating adjustment of the angle required for installation.

[0011] Furthermore, the roller realizes its own rolling through the shaft and the shaft sleeve arranged between the two sets of first clamping rods and between the two sets of second clamping rods.

[0012] Furthermore, a lifting ring is provided at the middle of the pin shaft at the top of the first connecting rod and the second connecting rod, which is used for connecting the lifting fixture to the lifting equipment.

[0013] Furthermore, the pin shafts are all provided with shaft sleeves for limiting the positions of the components installed on the pin shafts.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention installs two sets of ratchet self-locking mechanisms with opposite ratchet teeth between the two sets of four-bar clamps, and utilizes the locking cooperation between the stopping pawl and the ratchet to realize the self-locking function of the four-bar clamp in two movement directions when opening and clamping. The two self-locking modes of opening and clamping can be switched only by moving the rotating shaft. The structure is simple, the operation is convenient, and the two-way self-locking safety is high, which facilitates the lifting and installation of the workpiece and improves the lifting efficiency, the workpiece installation efficiency and the operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front structural diagram of the clamping state of a lifting clamp with bidirectional self-locking according to the present invention.

[0016] Figure 2This is a structural diagram of the reverse side of a clamping state of a lifting clamp with bidirectional self-locking according to the present invention.

[0017] Figure 3 The present invention is a schematic diagram of the structure of a ratchet self-locking mechanism of a lifting fixture with bidirectional self-locking.

[0018] Figure 4 This is a front structural diagram of the open state of a lifting clamp with bidirectional self-locking according to the present invention.

[0019] Figure 5 This is a structural diagram of the back side of a lifting clamp with bidirectional self-locking in the open state according to the present invention.

[0020] in: The first connecting rod 1, the second connecting rod 2, the first clamping rod 3, the second clamping rod 4, the pin 5, the extension rod 6, the ratchet 7, the stop pawl 8, the spring pressure plate 9, the rotating shaft 10, the roller 11, the lifting ring 12, the arc-shaped waist hole 13, the first clamping rod A31, the first clamping rod B32, the second clamping rod A41, and the second clamping rod B42. DETAILED DESCRIPTION

[0021] See also Figure 1~Figure 5 The present invention relates to a lifting fixture with bidirectional self-locking, comprising two sets of four-link clamps A and B connected in parallel and in mirror image through multiple pins 5, wherein the four-link clamp comprises a first connecting rod 1 and a second connecting rod 2 hinged at one end through a pin 5, and a first clamping rod 3 and a second clamping rod 4 hinged at the middle through a pin 5, wherein the lower end of the first connecting rod 1 is hinged to the upper end of the first clamping rod 3 through a pin 5, and the lower end of the second connecting rod 2 is hinged to the upper end of the second clamping rod 4 through a pin 5; each pin 5 is provided with a sleeve for axially limiting each component installed on the pin 5; a lifting ring 12 is provided in the middle of the pin 5 hinged at the top of the first connecting rod 1 and the second connecting rod 2, which is used for connecting the lifting fixture with a hoisting device such as a crane or a gantry crane; Two sets of ratchet self-locking mechanisms C and D are installed between the two sets of four-bar clamps, which are responsible for the self-locking of the first clamping rod 3 and the second clamping rod 4 when opening and clamping respectively; a rotating shaft 10 is movably arranged between the first clamping rod A31 and the first clamping rod B32 of the two sets of four-bar clamps; limit blocks are arranged at the two ends of the rotating shaft 10 located outside the first clamping rod 3 to limit the axial movement distance of the rotating shaft 10; The ratchet self-locking mechanism comprises a ratchet 7 mounted on a pin shaft 5 in the middle of a second clamping rod A41 and a second clamping rod B42 of two sets of four-bar clamps, a stop pawl 8 fixed on a rotating shaft 10 and cooperating with the ratchet 7 to achieve a locking action, and a spring pressing piece 9 fixed on the inner side of the first clamping rod 3 for pressing the stop pawl 8 onto the ratchet teeth of the ratchet 7; the teeth of the two ratchet wheels 7 of the two ratchet self-locking mechanisms are opposite; a lateral extension rod 6 is arranged on the side of the free end of the stop pawl 8, and the spring pressing piece 9 presses the extension rod 6 to press the stop pawl 8 onto the ratchet teeth of the ratchet 7, and accordingly, an arc is arranged on the first clamping rod 3. The arc-shaped waist hole 13 is provided. When the extension rod 6 moves axially and rotates along the rotating shaft 10 and the stop pawl 8, the extension rod 6 can be embedded and moved in the arc-shaped waist hole 13, providing a movable space for the extension rod 6 to move axially and rotate around the rotating shaft 10; relying on the one-way locking cooperation between the ratchet 7 and the stop pawl 8, that is, it can rotate freely along the tooth direction of the ratchet 7, and automatically lock and rotate against the tooth direction of the ratchet 7, so as to realize the one-way locking function. The two sets of ratchet self-locking mechanisms C and D are provided with opposite tooth directions of the ratchet 7, so as to realize the one-way self-locking of the clamp when opening and clamping, facilitate the clamp opening operation, and improve the clamp clamping safety; In order to realize that the two sets of ratchet self-locking mechanisms C and D can be independently self-locked without interfering with each other, the spacing between the two stop pawls 8 of the two sets of ratchet self-locking mechanisms on the rotating shaft 10 is greater than the spacing between the two ratchet wheels 7, ensuring that the two stop pawls 8 cannot contact the two ratchet wheels 7 at the same time; in fact, as long as it is ensured that the spacing between the two stop pawls 8 is not equal to the spacing between the two ratchet wheels 7, it can be achieved that at the same time, only one set of stop pawls 8 and the ratchet wheel 7 are in the automatic locking state. Therefore, in other embodiments, the spacing between the two stop pawls 8 can also be smaller than the spacing between the two ratchet wheels 7. According to the same principle, the spacing difference between the two should exceed the thickness of a single ratchet wheel 7, so as to avoid the interference between the two sets of ratchet wheels 7 and the stop pawls 8 at the same time; In this embodiment, the difference between the spacing between the two stop pawls 8 and the spacing between the two ratchet wheels 7 is equal to the axial movement distance of the rotating shaft 10, and the axial distance of the rotating shaft 10 should not be less than the thickness of a single ratchet wheel 7. By controlling the axial movement limit of the rotating shaft 10, it is possible to switch between the two sets of ratchet self-locking mechanisms conveniently and quickly, so that during hoisting, the clamp can be freely switched to open self-locking or clamped self-locking according to actual needs, which is convenient to switch, efficient and safe. Rollers 11 are arranged between the clamping parts of the two sets of first clamping rods 3, that is, between the hook-shaped clamping parts of the first clamping rod A31 and the first clamping rod B32, and between the clamping parts of the two sets of second clamping rods 4, that is, between the hook-shaped clamping parts of the second clamping rod A41 and the second clamping rod B42. The rollers 11 realize their own rolling through the shafts and sleeves arranged between the two sets of first clamping rods 3 and between the two sets of second clamping rods 4. During hoisting, multiple rollers 11 wrap around and contact the workpiece clamped by the hoisting, which protects the surface quality of the workpiece and allows the workpiece to rotate around its own axis during hoisting, so as to facilitate the adjustment of the angle required for installation. For example, when hoisting the thrust rod, the thrust rod angle can be adjusted by rotating the rollers 11, thereby meeting its installation requirements, simplifying the installation operation, and improving the installation efficiency.

[0022] In addition to being applied to the lifting of the thrust rod, the present invention can be applied to the lifting and assembly of other shaft parts, and can effectively improve the lifting and assembly efficiency of the shaft parts and the safety of the lifting operation.

[0023] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A lifting clamp with bidirectional self-locking, comprising two sets of four-link clamps A and B connected in parallel and in mirror image via a plurality of pins (5), the four-link clamp comprising a first connecting rod (1) and a second connecting rod (2) hinged at one end via a pin (5), a first clamping rod (3) and a second clamping rod (4) hinged at the middle via a pin (5), the lower end of the first connecting rod (1) and the upper end of the first clamping rod (3) being hinged via a pin (5), the lower end of the second connecting rod (2) and the upper end of the second clamping rod (4) being hinged via a pin (5), the characteristics being that: Two sets of ratchet self-locking mechanisms C and D are installed between the two sets of four-bar clamps, which are responsible for the self-locking of the first clamping rod (3) and the second clamping rod (4) when they are opened and clamped respectively; a rotating shaft (10) is movably arranged between the first clamping rod A (31) and the first clamping rod B (32) of the two sets of four-bar clamps; The ratchet self-locking mechanism comprises a ratchet (7) mounted on a pin shaft (5) in the middle of a second clamping rod A (41) and a second clamping rod B (42) of two sets of four-bar clamps, a stop pawl (8) fixed on a rotating shaft (10) and cooperating with the ratchet (7) to achieve a locking action, and a spring pressing piece (9) fixed on the inner side of the first clamping rod (3) for pressing the stop pawl (8) against the ratchet teeth of the ratchet (7); the teeth of the two ratchet wheels (7) of the two ratchet self-locking mechanisms are opposite in direction; The spacing between the two stop pawls (8) of the two sets of ratchet self-locking mechanisms on the rotating shaft (10) is greater than the spacing between the two ratchets (7), ensuring that the two stop pawls (8) cannot contact the two ratchets (7) at the same time.

2. The lifting fixture with bidirectional self-locking according to claim 1 is characterized in that: A transverse extension rod (6) is arranged on the side of the free end of the stop pawl (8), and the spring pressing sheet (9) presses the extension rod (6) to press the stop pawl (8) onto the ratchet teeth of the ratchet wheel (7).

3. The lifting fixture with bidirectional self-locking according to claim 2 is characterized in that: The first clamping rod (3) is provided with an arc-shaped waist hole (13) to provide a movable space for the extension rod (6) to follow the rotating shaft (10) and the stop pawl (8) to move axially and rotate.

4. The lifting fixture with bidirectional self-locking according to claim 1 is characterized in that: Limit blocks are provided at the two ends of the rotating shaft (10) located outside the first clamping rod (3) to limit the axial movement distance of the rotating shaft (10).

5. The lifting fixture with bidirectional self-locking according to claim 4 is characterized in that: The difference between the spacing between the two stop pawls (8) and the spacing between the two ratchet wheels (7) is equal to the axial movement distance of the rotating shaft (10).

6. The lifting fixture with bidirectional self-locking according to claim 1 is characterized in that: Rollers (11) are arranged between the hook-shaped clamping parts of the two sets of first clamping rods (3) and between the hook-shaped clamping parts of the two sets of second clamping rods (4). The rollers (11) are in contact with the hoisted workpiece, so that the workpiece can rotate around its own axis during hoisting, thereby facilitating adjustment of the angle required for installation.

7. The lifting fixture with bidirectional self-locking according to claim 6 is characterized in that: The roller (11) achieves its own rolling by means of an axle and axle sleeve which are arranged between two sets of first clamping rods (3) and two sets of second clamping rods (4).

8. The lifting fixture with bidirectional self-locking according to claim 1 is characterized in that: A lifting ring (12) is provided in the middle of the pin shaft (5) hinged at the top of the first connecting rod (1) and the second connecting rod (2), and is used for connecting the lifting fixture to the lifting equipment.

9. The lifting fixture with bidirectional self-locking according to claim 1, characterized in that: The pin shafts (5) are each provided with a shaft sleeve, which is used to limit the positions of various components mounted on the pin shafts (5).

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