Multi-point self-locking lifting clamp

Abstract

The present application relates to a kind of multi-point self-locking lifting clamps, including clamping unit, the clamping unit includes clamping assembly, two sets of clamping assembly are oppositely arranged, clamping assembly includes connecting rod assembly and rotating rod, rotating rod one end is connected with connecting rod assembly by first hinge, the other end is connected with second hinge, connecting rod assembly includes clamping plate and right side rod, clamping plate is connected with right side rod, right side rod is slidably arranged, when right side rod goes up, clamping plate is close to right side rod, when right side rod goes down, clamping plate is away from right side rod.The multi-point self-locking lifting clamps of the present application can clamp workpiece from side, cost-effective, and can realize self-locking when power source is disconnected, guarantee the safety of lifting clamp.

Description

Technical Field

[0001] This invention relates to the field of lifting equipment technology, and in particular to a multi-point self-locking lifting clamp. Background Technology

[0002] Lifting clamps are fixtures used to lift products. Currently, in some applications, multiple products need to be lifted and moved at once. Two types of lifting clamps are known to be used in similar situations: one type utilizes the product's bottom surface to bear its weight during lifting, with the weight resting on a mechanical component in contact with the product's bottom surface, thus achieving the lifting action; the other type uses multiple separate power sources to apply vertical forces to the sides of the product, overcoming its weight through static friction, thereby achieving the lifting action.

[0003] However, the first technical solution requires the use of the bottom surface of the product. When the bottom surface of the product is not suitable for use (such as when the bottom surface is an interference surface that needs to be avoided, or when the bottom surface itself is a working surface), this type of lifting clamp is no longer applicable. The second technical solution requires multiple additional power sources, which not only has a complex structure and high cost, but also when the power source fails (such as when there is a power outage or gas outage), the product will fall and be damaged or cause secondary safety accidents. Summary of the Invention

[0004] This invention addresses scenarios where the bottom surface of a product cannot be used when lifting it with a hoist, and also aims to ensure product safety during hoisting operations. For example, it addresses situations where the hoisting clamp cannot suddenly release due to a power source failure, preventing the product from falling abnormally. This invention provides a hoisting clamp that can clamp workpieces from the side, offers high cost-effectiveness, and can self-lock and ensure safety when the power source is disconnected.

[0005] The specific technical solution is as follows: A multi-point self-locking lifting clamp includes a clamping unit, the clamping unit includes a clamping assembly, two sets of clamping assemblies are arranged opposite to each other, the clamping assembly includes a connecting rod assembly and a rotating rod, one end of the rotating rod is connected to the connecting rod assembly through a first hinge, and the other end is connected to a second hinge, the connecting rod assembly includes a clamping plate and a right-side rod, the clamping plate is connected to the right-side rod, the right-side rod is slidably arranged, when the right-side rod moves upward, the clamping plate moves closer to the right-side rod, when the right-side rod moves downward, the clamping plate moves away from the right-side rod.

[0006] As a preferred technical solution, there are multiple clamping units, which are arranged in parallel.

[0007] As a preferred technical solution, the linkage assembly includes an upper crossbar and a lower crossbar. The two ends of the upper crossbar are respectively connected to the clamping plate and the right side rod pivot, and the two ends of the lower crossbar are respectively connected to the clamping plate and the right side rod pivot. The rotating rod is connected to the lower crossbar through a first hinge.

[0008] As a preferred technical solution, the clamping plate, the right side bar, the upper crossbar, and the lower crossbar form a parallelogram double-link structure.

[0009] As a preferred technical solution, the clamping units are connected in series via connectors.

[0010] As a preferred technical solution, the clamping unit includes a load-bearing frame, the clamping components are disposed on the load-bearing frame, and the load-bearing frame is sleeved on the connector.

[0011] As a preferred technical solution, the load-bearing frame includes a mirrored side frame and a top frame, with a through hole on the top frame.

[0012] As a preferred technical solution, the right-side rod is mounted on the side frame via a sliding assembly.

[0013] As a preferred technical solution, the right-side rod is connected by a pull rod, which is connected to a cylinder, and the cylinder drives the pull rod to move up and down.

[0014] As a preferred technical solution, the right-side rod is provided with a pin, and the pin is correspondingly set with the groove of the pull rod.

[0015] Technical effects of the present invention: The multi-point self-locking lifting clamp of the present invention has the following advantages: (1) The lifting clamp provided by the present invention can simultaneously lift multiple products from the side; (2) The lifting clamp provided by the present invention has good fault tolerance. Even when there is a certain difference in width between the products, the relative position and posture between the products can still be maintained during the lifting process; (3) The lifting clamp provided by the present invention has the characteristics of mechanical self-locking and safety and reliability. During use, it can maintain the clamping state of the product without any power source; if the weight of the product is increased during the clamping process, the greater the weight, the greater the clamping force; (4) The lifting clamp provided by the present invention is easy to operate, has a simple structure, low cost, convenient maintenance, and is reliable and practical. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a multi-point self-locking lifting clamp according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the clamping unit according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the clamping assembly according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the clamping assembly according to an embodiment of the present invention when the right rod slides upward.

[0021] Figure 5 This is a schematic diagram of the clamping unit clamping in an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the clamping unit in an embodiment of the present invention when it is opened.

[0023] Figure 7 This is a schematic diagram of the pull rod according to an embodiment of the present invention.

[0024] Figure 8 This is the present invention. Figure 7 A magnified view of the S-shaped section. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0029] like Figures 1 to 8 As shown, this embodiment of a multi-point self-locking lifting clamp includes a clamping unit 1, which includes clamping components 2, with two sets of clamping components 2 arranged opposite to each other. The clamping components 2 include a connecting rod assembly 3 and a rotating rod 4. One end of the rotating rod 3 is connected to the connecting rod assembly 3 via a first hinge 5, and the other end is connected to a second hinge 6. The connecting rod assembly 3 includes a clamping plate 31 and a right-side rod 32. The clamping plate 31 is connected to the right-side rod 32 and is located on the side. The right-side rod 32 is slidably arranged. When the right-side rod 32 moves upward, the clamping plate 31 moves closer to the right-side rod 32; when the right-side rod 32 moves downward, the clamping plate 31 moves away from the right-side rod 32. Multiple clamping units 1 are provided, arranged side-by-side. In the above technical solution, when the right-side rod 32 moves up and down, the connecting rod assembly will achieve a small-amplitude swaying motion under the constraint of the rotating rod 3, and the side clamping plate 31 will follow the lateral swaying motion. The lateral swing of the two mirror-arranged clamping plates 31 enables the opening and clamping of the clamping unit assembly 1, thereby clamping or releasing the product 10. By arranging multiple clamping units 1 in parallel, several products 10 can be clamped simultaneously. Through the above technical solution, multiple products can be clamped simultaneously from the side. The clamping device has good fault tolerance; even with certain differences in width between the products, the relative position and posture of each product can still be maintained during the clamping process.

[0030] In this embodiment, the linkage assembly 3 includes an upper crossbar 33 and a lower crossbar 34. The upper crossbar 33 is pivotally connected at both ends to the clamping plate 31 and the right side rod 32, respectively. The lower crossbar 34 is also pivotally connected at both ends to the clamping plate 31 and the right side rod 32, respectively. The rotating rod 4 is connected to the lower crossbar 34 via a first hinge 5. Thus, when the right side rod 32 moves up and down, the linkage assembly 3 enables the clamping plate to swing laterally. The clamping plate 31, the right side rod 32, the upper crossbar 33, and the lower crossbar 34 form a parallelogram double-link structure. This planar quadrilateral double-link structure allows for a small-amplitude swinging motion under the constraint of the rotating rod.

[0031] The following combination Figures 3 to 6 The motion principle of the multi-point self-locking lifting clamp in this embodiment will be further explained.

[0032] This embodiment employs a parallelogram-shaped double-link structure to achieve the lateral movement of the side clamping plate 31. Here, lateral movement refers to the movement of the side clamping plate in the opening and clamping directions. In this embodiment, clamping plate 31 corresponds to the left rod 20. Using the right rod 32 as a reference, when the upper and lower crossbars are rotated, the distance H between the right rod and the second hinge 6 increases or decreases, thus increasing or decreasing the distance L of the left rod 20 relative to the right rod 32; simultaneously, it ensures that the left rod 20 remains parallel to the right rod 32. A rotating rod 4 is set at the middle of one of the crossbars in this double-link structure. The newly set rotating rod 4 is connected to the crossbar via a first hinge 5, and a second hinge 6 is also set at the other end of the newly set rotating rod 4. The center of the second hinge 6 is set as a fixed point. When the right rod 32 moves up and down, it can drive the left rod 20 away from or towards the right rod 32. Mirroring and copying the above structure to the other side of the product, the lateral movement of the two side clamping plates constitutes the clamping and opening movement of the lifting clamp. If the product width is ≥ M-2AB-2AC (A, B, and C represent the positions of the hinges represented by the three circles in the figure, and M represents the distance between the two second hinges), the condition for the mechanism to clamp the product in terms of spatial displacement will be met.

[0033] When the mechanism is in a free state, the two clamping plates 31 tend to move downwards due to gravity. The movement area is divided into upper and lower regions by the line connecting the centers of the two second hinges 6. If the obstruction point of the mechanism's movement is set to ensure that the movement remains within the upper region, under the influence of gravity, the free-state movement tendency of the clamping plates 31 will decrease the distance D between the two clamping plates 31, thus clamping the product. Once the mechanism clamps the product and moves upwards to lift it, the product tends to move downwards under gravity. This gravity increases the normal force on the contact surface between the product's side and the side clamping plates 31. Since static friction equals the static friction coefficient multiplied by the normal force on the contact surface, an increase in the normal force also increases static friction. Thus, driven by static friction, the side clamping plates will move accordingly, and this tendency will shorten the distance between the clamping plates. The above analysis shows that once the mechanism clamps the workpiece, the heavier the workpiece, the tighter it will clamp. This achieves self-locking in the lifting clamping state.

[0034] Arrange an equal number of these mechanisms according to the number of workpieces, and then connect them with a component. Driven by an external power source, this component enables the simultaneous gripping and lifting of multiple products. Even when the widths of the products are slightly different, the mechanism can still adaptively adjust, preventing workpiece movement and maintaining their original posture throughout the gripping and holding process.

[0035] like Figure 1 , Figure 2 and Figure 7As shown, in this embodiment, the clamping unit 1 is connected in series via a connector 7, allowing multiple clamping units to be arranged side-by-side on the connector 7, which is a circular rod. The clamping unit 1 includes a load-bearing frame 8, with a clamping assembly 2 mounted on the load-bearing frame 8. The load-bearing frame 8 is sleeved on the connector 7, supporting the clamping assembly 2. The load-bearing frame 8 includes a mirror-image side frame 81 and a top frame 82. The top frame 82 has a through hole 83, allowing the connector 7 to pass through it. The right-side rod 32 is mounted on the side frame 81 via a sliding assembly 9, enabling it to slide up and down. In this embodiment, the sliding assembly 9 is a linear slide rail. The right-side rod 32 is connected via a pull rod 11, which is connected to a cylinder 12. The cylinder 12 drives the pull rod 11 to move up and down. The right-side rod 32 has a pin 13, which corresponds to the groove 111 of the pull rod 11. The up-and-down sliding of the right-side rod 32 is driven by the pin. The pin 13 includes a first pin 131 and a second pin 132, with the first pin 131 located above the second pin 132.

[0036] In the above embodiment, when the pull rod 11 is driven upward by the cylinder 12, the two pins on each clamping unit 1 in its longitudinal slide groove 111 are driven to follow the movement; wherein the second pin 132 contacts the lower part of the slide groove 111 of the pull rod 11 and is driven to move upward together, thereby realizing the upward movement of the right rod 32, the two mirror-arranged clamping plates 31 will increase, and the mechanism is in the open state.

[0037] When the lifting clamp is in a passive state, the pull rod 11 moves downward under its own weight and the spring force of the auxiliary cylinder 12. The two pins on each clamping unit in its longitudinal slide groove 111 are driven to follow the movement. The first pin 131 contacts the upper part of the slide groove of the pull rod 11 and is driven to move downward together, thereby realizing the downward movement of the right rod 32. The distance between the two mirror-arranged clamping plates 31 will decrease, and the mechanism will be in a clamping state.

[0038] A single pull rod 11 is installed, connecting to the right-side rods of each unit. A cylinder drives the pull rod 11 up and down, thereby moving the right-side rods of each unit up and down. When the pull rod 11 moves upward, the spacing between the side clamps increases, allowing the component to open. When the pull rod is in a free state (passive state), it moves downward under gravity (or with the cylinder applying gravity in the opposite direction), the spacing between the side clamps decreases, and the component clamps itself and locks itself. The connection between the pull rod and the right-side rod is a pin-slide connection. One end of the pin is fixed to the right-side rod, and the other end slides within a longitudinal slide groove. When the pull rod moves upward, the lower part of the slide groove travels a short distance before contacting the pins of each unit, causing the pins to move upward. When the pull rod moves downward, the pins of each unit move freely under gravity, traveling a short distance before contacting the upper part of the slide groove. Considering that the width of the products may not be completely consistent, we can assume that the upper and lower endpoints of this idle stroke displacement correspond to the clamping state of the widest product and the state of the narrowest product, respectively, and thus the length of the slide can be preset.

[0039] To facilitate the lifting clamp's movement in and out of the work area, an additional spacing between the side clamping plates needs to be designed. This is to avoid potential interference from product shapes (such as when the width of the product's upper surface is greater than the width of the clamping point), and also to account for potential collisions and interference between the lifting clamp and the product caused by clamp swaying during operation. The stroke of the cylinder driving the pull rod needs to be greater than the length of the slide groove plus this additional spacing between the side clamping plates.

[0040] To account for other potential issues during the use of this lifting clamp and to expedite its clamping action, the cylinder driving the pull rod is a single-acting spring self-resetting cylinder. The cylinder's self-resetting state corresponds to the clamping state of the lifting clamp, further ensuring safety during use.

[0041] The foregoing has described a multi-point self-locking lifting clamp of the present invention. However, the present invention is not limited to the specific embodiments described above. Various modifications or alterations can be made without departing from the scope of the claims. The present invention includes various modifications and alterations within the scope of the claims.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-point self-locking lifting clamp, comprising a clamping unit, characterized in that, The clamping unit includes clamping assemblies. Two sets of clamping assemblies are arranged opposite each other. Each clamping assembly includes a connecting rod assembly and a rotating rod. One end of the rotating rod is connected to the connecting rod assembly via a first hinge, and the other end is connected to a second hinge. The connecting rod assembly includes a clamping plate and a right-side rod. The clamping plate is connected to the right-side rod, which is slidably arranged. When the right-side rod moves upward, the clamping plate moves closer to the right-side rod; when the right-side rod moves downward, the clamping plate moves away from the right-side rod. There are multiple clamping units arranged in parallel. The clamping units are connected in series via connectors. The right-side rod is connected via a pull rod, which is connected to a cylinder. The cylinder drives the pull rod to move up and down. The right-side rod is provided with a pin, which is correspondingly arranged with the slide groove of the pull rod. When the pull rod moves upward, the lower part of the slide groove contacts each of the corresponding grooves after a certain free stroke. The pins of the clamping unit move upwards; when the pull rod moves downwards, the pins of each clamping unit move downwards freely under the action of gravity, and after a period of idle travel, they contact the upper part of the slide groove one after another. The upper and lower endpoints of the idle travel displacement correspond to the clamping state of the narrowest product and the clamping state of the widest product, respectively. The connecting rod assembly includes an upper crossbar and a lower crossbar. The two ends of the upper crossbar are respectively connected to the clamping plate and the right side rod pivot, and the two ends of the lower crossbar are respectively connected to the clamping plate and the right side rod pivot. The rotating rod is connected to the lower crossbar through a first hinge. The clamping unit includes a load-bearing frame. The clamping assembly is set on the load-bearing frame. The load-bearing frame is sleeved on the connector. The load-bearing frame includes a side frame and a top frame that are mirror images of each other. The top frame has a through hole. The right side rod is set on the side frame through a sliding assembly.

2. The multi-point self-locking lifting clamp according to claim 1, characterized in that, The clamp, right side bar, upper crossbar, and lower crossbar form a parallelogram double-link structure.

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