An adjustable mechanical gripper for excavators

Abstract

This utility model discloses an adjustable mechanical gripper for excavators, including a forearm, a fixed gripper, and an adjusting arm. Two ear plates are fixedly connected to both the forearm and the fixed gripper. The two ear plates are arranged opposite each other and each has an ear plate hole. A bushing is coaxially inserted through each ear plate hole. The adjacent ends of the two bushings are connected to each other by a threaded sleeve. The outer periphery of the opposite ends of the two bushings is circumferentially provided with a flange. Pin holes are provided at both ends of the adjusting arm, and the pin holes are connected to the bushings via a pin shaft. The bushing design of this utility model protects the ear plates and reduces wear. The threaded connection between the threaded sleeve and the bushing facilitates the disassembly and replacement of the bushing. Replacing the bushing and the pin shaft effectively solves the problem of wear at the connection between the adjusting arm and the ear plates, thereby improving the gripping stability of the mechanical gripper.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical gripper technology, and in particular relates to an adjustable mechanical gripper for excavators. Background Technology

[0002] Excavator grippers are used to grab and move materials. Existing grippers include... Figure 1 The device includes a movable gripper 103 and a fixed gripper 104. In order to adapt and install it to the excavator, both the movable gripper 103 and the fixed gripper 104 are hinged to the front end of the excavator's boom 101. A hydraulic cylinder 102 is provided between the movable gripper 103 and the boom 101 to drive the movable gripper 103 to open and close. The fixed gripper 104 is fixedly connected to the boom 101 through an adjusting arm 3.

[0003] In order to adjust the opening of the fixed gripper 104, it is necessary to replace the adjusting arm 3 with one of different lengths. This requires frequent disassembly and replacement of the adjusting arm 3. Frequent disassembly and replacement will cause increased wear at the connection between the adjusting arm 3 and the fixed gripper 104 and the forearm 101, resulting in loosening of the connection between the parts and affecting the stability of the mechanical gripper.

[0004] Therefore, how to deal with the wear at the connection between the adjusting arm 3 and the fixed gripper 104 and the forearm 101 is an urgent problem to be solved. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide an adjustable mechanical gripper for excavators, thereby improving the stability and reliability of the mechanical gripper's operation.

[0006] To achieve the above objectives, the specific technical solution of the adjustable mechanical gripper for excavators of this utility model is as follows:

[0007] An adjustable mechanical gripper for excavators includes a forearm, a fixed gripper, and an adjusting arm. Two lugs are fixedly connected to both the forearm and the fixed gripper. The two lugs are arranged opposite each other and each has a lug hole. A bushing is coaxially inserted through each lug hole. The adjacent ends of the two bushings are connected to each other via threaded sleeves. A flange is circumferentially provided on the outer periphery of the opposite ends of the two bushings. Pin holes are provided at both ends of the adjusting arm, and the pin holes are connected to the bushings via pin shafts.

[0008] Preferably, the inner walls at both ends of the threaded sleeve are provided with internal threads, the two internal threads are in opposite directions, the bushing is provided with an external thread that matches the internal threads at one end near the threaded sleeve, and a handle is provided on the outer periphery of the threaded sleeve.

[0009] Preferably, the edge of the ear plate hole is provided with a notch, and the bushing is provided with a limiting key that matches the notch, and the limiting key is inserted into the notch.

[0010] Preferably, the inner surface of the bushing is provided with a guide groove for receiving grease.

[0011] Preferably, the adjusting arm includes two oppositely arranged connecting plates, which are fixedly connected to each other by a fixing plate. The pin hole is opened at the end of the connecting plate, the ear plate is located between the two connecting plates, and the pin shaft is coaxially arranged through the pin hole and the bushing.

[0012] Preferably, an extension is provided on the side of one end of the pin shaft, and a locking block is detachably connected to the side of one of the connecting plates opposite to the fixing plate. The locking block has a notch on the side of the connecting plate near the connecting plate for accommodating the extension.

[0013] Preferably, a liner is provided circumferentially around the outer periphery of the pin hole.

[0014] Preferably, the cross-sectional shape of the fixing plate is V-shaped along the plane where the connecting plate is located.

[0015] The adjustable mechanical gripper for excavators of this utility model has the following advantages: the bushing can protect the ear plate and reduce wear; the threaded connection between the threaded sleeve and the bushing facilitates the disassembly and replacement of the bushing; and the replacement of the bushing and the pin shaft can effectively solve the problem of wear at the connection between the adjusting arm and the ear plate, thereby improving the gripping stability of the mechanical gripper. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the mechanical gripper with different opening degrees according to this utility model;

[0017] Figure 2 This is a schematic diagram of the mechanical gripper of this utility model;

[0018] Figure 3 This is a schematic diagram of the installation structure of the adjusting arm of this utility model;

[0019] Figure 4 This is a schematic diagram of the connection structure between the adjusting arm and the bushing of this utility model;

[0020] Figure 5 This is a schematic diagram of the structure of the bushing of this utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the adjusting arm of this utility model;

[0022] Figure 7 This is a schematic diagram of the structure of the pin shaft of this utility model;

[0023] The markings in the diagram are as follows: 101, forearm; 104, fixed gripper; 105, ear plate; 106, ear plate hole; 107, notch; 201, threaded sleeve; 202, bushing; 203, handle; 204, limit key; 205, guide groove; 206, flange; 3, adjusting arm; 301, connecting plate; 302, fixing plate; 303, locking block; 304, pin hole; 305, liner; 4, insertion pin; 401, extension. Detailed Implementation

[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0025] The terms "top surface," "bottom surface," and "full surface" are used with reference to the normal operating state of the mechanical gripper and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model.

[0026] like Figure 1-3 As shown, an adjustable mechanical gripper for an excavator includes a forearm 101, a fixed gripper 104, and an adjusting arm 3. Two ear plates 105 are fixedly connected to both the forearm 101 and the fixed gripper 104. The two ear plates 105 are arranged opposite each other and each has an ear plate hole 106. A bushing 202 is coaxially inserted through each of the two ear plate holes 106. The adjacent ends of the two bushings 202 are connected to each other by a threaded sleeve 201. The outer periphery of the opposite ends of the two bushings 202 is circumferentially provided with a flange 206. Pin holes 304 are opened at both ends of the adjusting arm 3. The pin holes 304 are connected to the bushings 202 by a pin shaft 4.

[0027] The aforementioned mechanical gripper is suitable for installation on the boom of an excavator. Since the boom of a conventional excavator usually has only one hydraulic cylinder, this hydraulic cylinder is connected to the movable gripper to drive the movable gripper to open and close. The fixed gripper 104 does not have an additional hydraulic cylinder to drive it. Ear plates 105 are welded on both the boom 101 and the fixed gripper 104, and an adjusting arm 3 is set between the ear plates 105. By replacing the adjusting arm 3 of different lengths, the angle of the fixed gripper 104 can be adjusted, ultimately achieving the adjustment of the maximum opening between the movable gripper and the fixed gripper 104.

[0028] The forearm 101, adjusting arm 3, and fixed jaw 104 can be fixed by inserting the pin shaft 4 into the ear plate hole 106 and pin hole 304. Replacing the adjusting arm 3 by inserting and removing the pin shaft 4 will cause wear. Since the ear plate 105 is welded and fixed to the forearm 101 and fixed jaw 104, it is difficult to replace after wear. Therefore, a bushing 202 can be used to protect the ear plate 105 and reduce its wear. Furthermore, the two bushings 202 on the two ear plates 105 in the same group are fixedly connected by a threaded sleeve 201. When disassembly is required, it is only necessary to disconnect the threaded sleeve 201 from the bushing 201. The connection between the two parts allows the bushing 202 to be removed from the ear plate 105 for replacement, improving the ease of bushing 202 replacement. By replacing the bushing 202 and the pin shaft 4, the wear problem at the connection between the adjusting arm 3, the forearm 101, and the fixed gripper 104 can be effectively solved, making the connection between the three parts tighter and improving the stability of the mechanical gripper in grasping heavy objects. Furthermore, by improving the ease of replacing the bushing 202, the wear problem at the connection between the adjusting arm 3, the forearm 101, and the fixed gripper 104 can be solved more quickly and easily, greatly improving the practicality of the mechanical gripper.

[0029] Further improvements include, for example Figure 4 As shown, the inner walls at both ends of the threaded sleeve 201 are provided with internal threads, and the two internal threads are in opposite directions. The end of the bushing 202 adjacent to the threaded sleeve 201 is provided with an external thread that matches the internal threads. A handle 203 is provided on the outer periphery of the threaded sleeve 201. The handle 203 provides convenient leverage for gripping or rotating the threaded sleeve 201. Since the two sections of the internal threads of the threaded sleeve 201 are in opposite directions, the threaded sleeve 201 can be tightened and loosened simultaneously with the two bushings 202 when the threaded sleeve 201 is turned. Compared with tightening or loosening the two bushings 202 and the threaded sleeve 201 separately, the efficiency of disassembling and assembling the bushings 202 can be improved.

[0030] Further improvements include, for example Figure 2 and 4 As shown, a notch 107 is provided on the edge of the ear plate hole 106, and a limiting key 204 matching the notch 107 is provided on the bushing 202. The limiting key 204 and the notch 107 are inserted into each other. The notch 107 and the limiting key 204 limit each other, which can prevent the bushing 202 from rotating when the threaded sleeve 201 is turned, further improving the convenience of disassembling and assembling the bushing 202; and the mutual limiting between the ear plate 106 and the bushing 202 can reduce the dynamic friction between the two during subsequent use, thereby reducing the wear between the two and extending their service life.

[0031] Further improvements include, for example Figure 4As shown, the inner surface of the bushing 202 is provided with a guide groove 205 for receiving grease. The grease inside the guide groove 205 can be slowly released later, thereby reducing the wear between the bushing 202 and the pin shaft 4, extending the service life of the equipment, and reducing the friction between the two. It also makes it easier to remove the pin shaft 4 from inside the bushing 202, improving the ease of disassembly and assembly of the pin shaft 4.

[0032] Further improvements include, for example Figure 5 As shown, the adjusting arm 3 includes two connecting plates 301 arranged opposite to each other. The two connecting plates 301 are fixedly connected to each other by a fixing plate 302. The pin hole 304 is opened at the end of the connecting plate 301. The ear plate 105 is located between the two connecting plates 301. The insert pin shaft 4 is coaxially arranged through the pin hole 304 and the bushing 202. The fixing plate 302 is welded and fixed to the two connecting plates 301 to form a whole. The two ear plates 105 of the same group are located between the two connecting plates 301, so that the connecting plates 301 can limit the bushing 202 from both sides to prevent the bushing 202 from falling out of the ear plate hole 106 and improve the firmness of the bushing 202 installation. The pin shaft 4 passes through the pin hole 304 on the two connecting plates 301 and the ear plate hole 106 on the two ear plates 105, which can improve the firmness of the connection between the pin shaft 4 and the adjusting arm 3 and the ear plate 105, thereby improving the firmness of the mutual fixation between the forearm 101 and the fixing claw 104. The adjusting arm 3 is formed by welding the connecting plate 301 and the fixing plate 302. The overall weight of the adjusting arm 3 can be reduced by the thin plate structure while maintaining the strength of the adjusting arm 3.

[0033] Further improvements include, for example Figure 5 and 6 As shown, an extension 401 is provided on the side of one end of the pin shaft 4. A locking block 303 is detachably connected to the side of a connecting plate 301 opposite to the fixing plate 302. The locking block 303 has a recess on the side of the connecting plate 301 near the connecting plate 301 to accommodate the extension 401. The locking block 303 is fixed to the connecting plate 301 by bolts. By fixing the extension 401 with the locking block 303, the axial movement and rotation of the pin shaft 4 can be restricted. This ensures the secure installation of the pin shaft 4 while reducing its wear.

[0034] Further improvements include, for example Figure 5 As shown, a liner 305 is provided around the outer periphery of the pin hole 304. The liner 305 increases the thickness around the pin hole 304, thereby improving the strength of the pin hole 304, improving the structural strength of the adjusting arm 3, and ultimately improving the stability of the connection between the forearm 101 and the fixed gripper 104, and improving the stability of the mechanical gripper's gripping.

[0035] Further improvements include, for example Figure 5As shown, along the plane where the connecting plate 301 is located, the cross-sectional shape of the fixing plate 302 is V-shaped. The V-shaped fixing plate 302 can better resist bending, thereby further improving the structural strength of the adjusting arm 3, improving the stability of the connection between the forearm 101 and the fixed gripper 104, and improving the stability of the mechanical gripper's grasping.

[0036] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. An adjustable mechanical gripper for excavators, comprising a forearm (101), a fixed gripper (104), and an adjustable arm (3), characterized in that: Two ear plates (105) are fixedly connected to both the forearm (101) and the fixed gripper (104). The two ear plates (105) are arranged opposite to each other and each has an ear plate hole (106). A bushing (202) is coaxially inserted through the two ear plate holes (106). The adjacent ends of the two bushings (202) are connected to each other through a threaded sleeve (201). The outer periphery of the opposite ends of the two bushings (202) is provided with a flange (206) in the circumferential direction. Both ends of the adjusting arm (3) are provided with pin holes (304), and the pin holes (304) are connected to the bushing (202) through the pin shaft (4).

2. The adjustable mechanical gripper for excavators according to claim 1, characterized in that, The inner walls at both ends of the threaded sleeve (201) are provided with internal threads, and the two internal threads are in opposite directions. The bushing (202) is provided with an external thread that matches the internal thread at one end near the threaded sleeve (201). A handle (203) is provided on the outer periphery of the threaded sleeve (201).

3. The adjustable mechanical gripper for excavators according to claim 1, characterized in that, The ear plate hole (106) has a notch (107) on its edge, and the bushing (202) is provided with a limiting key (204) that matches the notch (107). The limiting key (204) is inserted into the notch (107).

4. The adjustable mechanical gripper for excavators according to claim 1, characterized in that, The inner surface of the bushing (202) is provided with a guide groove (205) for receiving grease.

5. The adjustable mechanical gripper for excavators according to claim 1, characterized in that, The adjusting arm (3) includes two oppositely arranged connecting plates (301), which are fixedly connected to each other by a fixing plate (302). The pin hole (304) is opened at the end of the connecting plate (301), and the ear plate (105) is located between the two connecting plates (301). The insert pin shaft (4) is coaxially arranged through the pin hole (304) and the bushing (202).

6. The adjustable mechanical gripper for excavators according to claim 5, characterized in that, An extension (401) is provided on the side of one end of the pin shaft (4), and a locking block (303) is detachably connected to the side of the connecting plate (301) away from the fixing plate (302). The locking block (303) has a notch for accommodating the extension (401) on the side of the connecting plate (301).

7. The adjustable mechanical gripper for excavators according to claim 5, characterized in that, A liner (305) is provided on the outer periphery of the pin hole (304).

8. The adjustable mechanical gripper for excavators according to claim 5, characterized in that, Along the direction of the plane where the connecting plate (301) is located, the cross-sectional shape of the fixing plate (302) is V-shaped.

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