quick change device and loader

Abstract

This utility model relates to loaders. To address the problem of debris easily entering the cylinder pin assembly compartment of existing quick-change devices through the indicator rod perforation at the top, this utility model constructs a quick-change device and a loader. The quick-change device includes a quick-change frame and a cylinder pin assembly compartment mounted on the quick-change frame for accommodating the cylinder pin assembly. An indicator rod perforation is provided on the rear wall of the cylinder pin assembly compartment. The front end of the indicator rod in the cylinder pin assembly is hinged to the quick-change cylinder in the cylinder pin assembly via a pin, and the rear end of the indicator rod passes through the indicator rod perforation and points towards the rear of the cylinder pin assembly compartment. In this utility model, the indicator rod indicating the extension / retraction state of the quick-change cylinder extends rearward, and the indicator rod perforation is located on the rear wall of the cylinder pin assembly compartment. When this quick-change device is installed and in operation, small materials are less likely to enter the cylinder pin assembly compartment through the indicator rod perforation, thus reducing the impact on the quick-change cylinder.

Description

Technical Field

[0001] This utility model relates to a loader, and more specifically, to a quick-change device and a loader. Background Technology

[0002] The primary working attachment of a loader is the bucket. To perform tasks other than shoveling, the bucket is replaced with other corresponding attachments. To enable quick attachment changes and ensure a secure connection, the loader is equipped with a quick-change device in its working assembly. The quick-change device is connected to the boom and bucket linkage via pins, and the attachments are mounted on it. The quick-change device features a hydraulic cylinder pin assembly. This assembly includes a quick-change cylinder and a quick-change pin pushed by the cylinder. When the pin hole on the attachment is coaxially aligned with the pin hole on the quick-change device, the cylinder extends, pushing the pin into the aligned hole. When the cylinder retracts, the pin is pulled out, allowing the attachment to be separated from the quick-change device. The quick-change device has a cylinder pin assembly compartment enclosed by a steel plate. The cylinder is housed within this compartment, and the quick-change pin extends from both ends.

[0003] To facilitate the driver in the cab to know the extension and retraction status of the quick-change cylinder and determine whether the quick-change pin is in place, the quick-change cylinder assembly also includes two indicator rods. The upper wall of the cylinder pin assembly compartment is provided with indicator rod through holes. The indicator rod passes through the indicator rod through the indicator rod through holes from bottom to top inside the cylinder pin assembly compartment. The lower end of the indicator rod is connected to the cylinder. When the quick-change cylinder extends or retracts, the upper end of the indicator rod swings in the left and right direction. The operator can judge whether the pin has extended and is in place based on the swing direction of the indicator rod.

[0004] In the aforementioned prior art quick-change device, because the indicator rod perforation is located on the upper wall of the cylinder pin assembly compartment, small particles of debris accumulate above the cylinder pin assembly compartment during loader operation and, under the influence of gravity, enter the cylinder pin assembly compartment through the indicator rod perforation. If too much debris accumulates in the cylinder pin assembly compartment, it will affect the extension and retraction of the quick-change cylinder, thereby affecting whether the quick-change pin can be effectively engaged. Utility Model Content

[0005] The technical problem this utility model aims to solve is that debris can easily enter the cylinder cavity through the indicator rod hole in the existing quick-change device's cylinder pin assembly compartment. The present invention provides a quick-change device and loader that reduces the amount of debris entering the cylinder cavity through the indicator rod hole.

[0006] The technical solution of this utility model to achieve its purpose is: a quick-change device, including a quick-change frame and a cylinder pin assembly compartment disposed on the quick-change frame for accommodating and installing a cylinder pin assembly. The rear wall panel of the cylinder pin assembly compartment is provided with an indicator rod through hole. The front end of the indicator rod in the cylinder pin assembly is hinged to the quick-change cylinder in the cylinder pin assembly through a pin shaft, and the rear end of the indicator rod passes through the indicator rod through hole and points to the rear of the cylinder pin assembly compartment.

[0007] In the quick-change device of this utility model, the two quick-change pins in the cylinder pin assembly are arranged coaxially, one of which is rigidly connected to the cylinder barrel of the quick-change cylinder, and the other is rigidly connected to the piston rod of the quick-change cylinder; the two quick-change pins are clearance-fitted with the pin holes at both ends of the cylinder pin assembly compartment.

[0008] In the quick-change device of this utility model, there are two indicator rods, one of which is connected to the cylinder of the quick-change cylinder, and the other of which is connected to the piston rod of the quick-change cylinder.

[0009] In the quick-change device of this utility model, the front end of the indicator rod is connected to the upper side of the quick-change cylinder.

[0010] In the quick-change device of this utility model, a limiting block is provided on the wall of the cylinder pin assembly compartment to limit the travel of the cylinder barrel or piston rod relative to the compartment wall when the quick-change cylinder retracts.

[0011] In the quick-change device of this utility model, the limiting block has a U-shaped groove, and the piston rod of the quick-change cylinder extends from one side of the limiting block through the U-shaped groove to the other side of the limiting block. The piston rod has a limiting abutment part with a radial dimension larger than the width of the U-shaped groove, and the limiting block is located between the limiting abutment part and the cylinder.

[0012] In the quick-change device of this utility model, the cylinder pin assembly compartment is arranged between the boom hinge seats at both ends of the quick-change frame. The two ends of the upper wall plate, rear wall plate and lower wall plate of the cylinder pin assembly compartment are welded to the inner side plates of the support of the boom hinge seats at both ends. The front wall plate of the cylinder pin assembly compartment is detachably fixed to the upper wall plate and the lower wall plate.

[0013] In the quick-change device of this utility model, when the quick-change cylinder is in the fully retracted state, the two sides of the limiting block abut against the cylinder end and the limiting abutment part of the quick-change cylinder, respectively.

[0014] In the quick-change device of this utility model, the inner side of the inner side plate of the boom hinge seat is welded with a support rib for supporting the inner side of the end of the front wall plate, the depth of the cylinder pin assembly compartment in the front-rear direction is set to be wider at the bottom and narrower at the top, and the upper part of the front wall plate is bent backward.

[0015] The technical solution of this utility model to achieve its purpose is: a loader having the aforementioned quick-change device.

[0016] Compared with the prior art, in this invention, the indicator rod indicating the extension and retraction state of the quick-change cylinder extends backward, and the indicator rod through hole is set on the rear wall of the cylinder pin assembly compartment. When this quick-change device is installed, small materials are less likely to enter the cylinder pin assembly compartment through the indicator rod through hole, thus reducing the impact on the quick-change cylinder. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the quick-change device of this utility model.

[0018] Figure 2 This is a structural schematic diagram of the quick-change frame in the quick-change device of this utility model.

[0019] Figure 3 This is a structural schematic diagram of the hydraulic cylinder pin assembly in the quick-change device of this utility model.

[0020] Figure 4 This is a schematic diagram of the cylinder section of the hydraulic cylinder pin assembly in the quick-change device of this utility model.

[0021] Figure 5 This is a rear view of the quick-change device of this utility model when the quick-change cylinder is extended.

[0022] Figure 6 This is a view of the cylinder pin assembly in the quick-change device of this utility model when the quick-change cylinder retracts.

[0023] Figure 7 This is a rear view of the quick-change device of this utility model when the quick-change cylinder retracts.

[0024] Component names and serial numbers in the diagram:

[0025] Quick-change frame 100, bucket tie rod hinge seat 110, boom hinge seat 120, support inner side plate 121, attachment connecting pin 122, and pin through hole 123.

[0026] Hydraulic cylinder pin assembly 200, quick-change hydraulic cylinder 210, cylinder barrel 211, piston rod 212, limit abutment part 213, right quick-change pin 22, left quick-change pin 23, pin shaft 25, indicator rod 240, right indicator rod 241, left indicator rod 242.

[0027] Hydraulic cylinder pin assembly compartment 300, lower wall panel 301, rear wall panel 302, upper wall panel 303, front wall panel 304, support rib 305, indicator rod through hole 306, limit block 307. Detailed Implementation

[0028] The specific implementation plan is described below with reference to the attached diagram.

[0029] like Figure 1 As shown, the quick-change device includes a quick-change frame 100 and a cylinder pin assembly compartment mounted on the quick-change frame 100 for accommodating and mounting the cylinder pin assembly 200. An indicator rod through-hole 306 is provided on the rear wall panel 302 of the cylinder pin assembly compartment. The front end of the indicator rod 240 in the cylinder pin assembly 200 is hinged to the quick-change cylinder 210 in the cylinder pin assembly 200 via a pin 25. The rear end of the indicator rod 240 passes through the indicator rod through-hole 306 and points towards the rear of the cylinder pin assembly compartment. When the quick-change cylinder 210 extends or retracts, it drives the indicator rod 240, causing its front end to move in the left-right direction. The rear end of the indicator rod 240, pointing towards the rear of the quick-change frame 100, swings in the opposite direction to the swing direction of its front end. By observing the swing direction of the rear end of the indicator rod 240, it can be determined whether the quick-change cylinder is in the extended state or the retracted state, and thus determine whether the quick-change pin is effectively inserted into the attachment in the pin hole 123.

[0030] like Figure 2 As shown, the quick-change frame 100 includes a centrally located bucket tie rod hinge seat 110 and boom hinge seats 120 located at the left and right ends. The bucket tie rod hinge seat 110 is used to connect with the bucket tie rod of the loader, and the boom hinge seat 120 is used to connect with the boom of the loader. The bucket tie rod pulls the quick-change frame 100 to rotate back and forth around the front end of the boom.

[0031] The upper part of the boom hinge seat 120 is provided with an attachment connecting pin 122 for connecting with the hook on the attachment. The lower part of the boom hinge seat 120 is provided with a pin through hole 123, into which a quick-change pin can be inserted. When the pin hole on the attachment is coaxially aligned with the pin through hole 123, the quick-change pin can be inserted, thus connecting the quick-change frame 100 and the attachment. When the quick-change cylinder 210 retracts, the quick-change pin is pulled out. After the lower part of the attachment is disconnected from the quick-change frame 100, the attachment moves to disconnect the hook on its upper part from the quick-change attachment connecting pin 122, thereby connecting the attachment to the quick-change frame 100.

[0032] The boom hinge seat 120 includes two parallel outer support plates and inner support plates 121. The cylinder pin assembly compartment 300 is arranged between the inner support plates 121 of the two boom hinge seats 120. The two ends of the upper wall plate 303, rear wall plate 302 and lower wall plate 301 constituting the cylinder pin assembly compartment 300 are welded to the inner support plates 121 of the boom hinge seats 120 at both ends. The front wall plate 304 constituting the cylinder pin assembly compartment 300 is detachably fixedly connected to the upper wall plate 303 and the lower wall plate 301.

[0033] The cylinder pin assembly compartment 300 is designed with a depth that is wider at the bottom and narrower at the top in the longitudinal direction, and the upper part of the front wall panel 304 is bent backward. With this design, after removing the front wall panel 304, a larger maintenance space can be obtained to maintain the cylinders, pins and other components in the cylinder pin assembly compartment.

[0034] The inner side of the inner plate 121 of the boom hinge seat 120 is welded with a support rib 305 for supporting the inner side of the end of the front wall panel. The upper and lower sides of the front wall panel 304 are respectively fixedly connected to the upper wall panel 303 and the lower wall panel 301 by screws. The support rib 305 supports both ends of the front wall panel 304, reduces the gap, and thus prevents debris from entering the cylinder pin assembly compartment from there.

[0035] An indicator rod through hole 306 is provided on the rear wall panel 302 of the cylinder pin assembly compartment 300. The rear end of the indicator rod 240 passes through the indicator rod through hole 306 and points to the rear of the cylinder pin assembly compartment 300. The indicator rod 240 swings with the extension and retraction of the quick-change cylinder 210, thereby indicating the status and position of the quick-change cylinder 210 and the quick-change pin.

[0036] Optionally, such as Figure 2 As shown, the two quick-change pins in the cylinder pin assembly 200 are arranged coaxially. The right quick-change pin 22 is rigidly connected to the right end of the cylinder barrel 211 of the quick-change cylinder 210, and the left quick-change pin 23 is rigidly connected to the left end of the piston rod 212 of the quick-change cylinder. The left and right quick-change pins are clearance-fitted with the pin holes 123 at the left and right ends of the cylinder pin assembly compartment 300. When the quick-change cylinder 210 extends or retracts, the left and right quick-change pins slide in the corresponding pin holes 123. The cylinder pin assembly 200 is installed by supporting the quick-change pins at both ends using the pin holes 123 at both ends.

[0037] Furthermore, the indicator rod 240 has two parts, with the right indicator rod 241 connected to the right end of the cylinder 211 of the quick-change cylinder 210 via a pin 25, and the left indicator rod 242 fixedly connected to the left end of the piston rod 212 of the quick-change cylinder 210 via a pin 25. Furthermore, the front ends of both indicator rods are connected to the upper side of the quick-change cylinder 210.

[0038] Optionally, a limiting block 307 is provided on the bulkhead of the cylinder pin assembly compartment 300 to limit the travel of the cylinder barrel 211 or piston rod 212 relative to the bulkhead when the quick-change cylinder 210 retracts. When the quick-change cylinder 210 retracts, one of the components (e.g., the piston rod) moves relative to the bulkhead. When the moving component (piston rod) comes into contact with the limiting block 307, its movement is restricted, and the other component (cylinder) begins to move, ultimately causing both the piston rod and the cylinder to move and pull out the quick-change pin.

[0039] In a preferred embodiment, the limiting block 307 has a U-shaped groove, such as Figure 2 As shown, the piston rod 212 of the quick-change cylinder 210 extends from one side of the limiting block 307 through a U-shaped groove to the other side of the limiting block 307. The piston rod 212 has a limiting abutment portion 213 with a radial dimension larger than the width of the U-shaped groove. The limiting block 307 is located between the limiting abutment portion 213 and the cylinder barrel 211. When the quick-change cylinder 210 retracts, if the limiting abutment portion 213 on the piston rod 212 abuts against the limiting block 307 and is limited, the piston rod 212 stops moving relative to the bulkhead. At this time, the cylinder barrel 211 moves until the end of the cylinder barrel 211 of the quick-change cylinder 210 abuts against the limiting block 307. At this point, the quick-change cylinder 210 is fully retracted, and the quick-change pins at both ends are completely pulled out of the pin holes of the attachment.

[0040] In this embodiment, if the quick-change cylinder 210 extends and the left and right quick-change pins are fully inserted into the pin holes 123, the attachment can be connected to the quick-change frame 100. At this time, the rear end of the indicator rod 240 swings towards the center surface of the quick-change frame 100. Figure 1 and Figure 5 As shown, when the operator in the cab looks at the indicator levers 240, the two indicator levers 240 form an inverted V-shape. If the quick-change cylinder 210 shortens, the two quick-change pins are pulled out from the pin holes 123, disengaging from the attachment and the quick-change bracket 100. At this time, the rear end of the indicator lever 240 swings away from the center surface of the quick-change bracket, as shown. Figure 6 and Figure 7 As shown, when the operator in the cab looks at the indicator rods, the two indicator rods 240 form a V-shape. In this embodiment, the indicator rod through-hole 306 is provided on the rear wall panel 302 of the cylinder pin assembly compartment 300. The rear wall panel 302 is a vertical plate. During operation, fine particles will not enter the cylinder pin assembly compartment 300 through the indicator rod through-hole 306 under the action of gravity, thereby reducing the amount of debris entering the cylinder pin assembly compartment 300 and preventing the rapid accumulation of debris in the cylinder pin assembly compartment 300 from affecting the insertion and removal of the cylinder pin assembly 200.

[0041] This embodiment also provides a loader having the aforementioned quick-change device.

Claims

1. A quick-change device, comprising a quick-change frame and a cylinder pin assembly compartment disposed on the quick-change frame for accommodating and mounting a cylinder pin assembly, characterized in that, An indicator rod through hole is provided on the rear wall panel of the cylinder pin assembly compartment; the front end of the indicator rod in the cylinder pin assembly is hinged to the quick-change cylinder in the cylinder pin assembly via a pin, and the rear end of the indicator rod passes through the indicator rod through hole and points to the rear of the cylinder pin assembly compartment.

2. The quick-change device according to claim 1, characterized in that, The two quick-change pins in the cylinder pin assembly are arranged coaxially, with one quick-change pin rigidly connected to the cylinder barrel of the quick-change cylinder and the other quick-change pin rigidly connected to the piston rod of the quick-change cylinder; the two quick-change pins are clearance-fitted with the pin holes at both ends of the cylinder pin assembly compartment.

3. The quick-change device according to claim 2, characterized in that, The indicator rod has two parts, one of which is connected to the cylinder of the quick-change cylinder, and the other of which is connected to the piston rod of the quick-change cylinder.

4. The quick-change device according to claim 3, characterized in that, The front end of the indicator rod is connected to the upper side of the quick-change cylinder.

5. The quick-change device according to any one of claims 2 to 4, characterized in that, The bulkhead of the cylinder pin assembly compartment is provided with a limiting block to restrict the travel of the cylinder barrel or piston rod relative to the bulkhead when the quick-change cylinder retracts.

6. The quick-change device according to claim 5, characterized in that, The limiting block has a U-shaped groove, and the piston rod of the quick-change cylinder extends from one side of the limiting block through the U-shaped groove to the other side of the limiting block. The piston rod has a limiting abutment portion with a radial dimension larger than the width of the U-shaped groove, and the limiting block is located between the limiting abutment portion and the cylinder barrel.

7. The quick-change device according to claim 6, characterized in that, When the quick-change cylinder is in the fully retracted state, the two sides of the limiting block abut against the cylinder end of the quick-change cylinder and the limiting abutment part, respectively.

8. The quick-change device according to claim 1, characterized in that, The cylinder pin assembly compartment is arranged between the boom hinge seats at both ends of the quick-change frame. The two ends of the upper wall panel, rear wall panel and lower wall panel of the cylinder pin assembly compartment are welded to the inner side plates of the support of the boom hinge seats at both ends. The front wall panel of the cylinder pin assembly compartment is detachably fixed to the upper wall panel and the lower wall panel.

9. The quick-change device according to claim 8, characterized in that, The inner side of the inner side plate of the boom hinge seat is welded with supporting ribs for supporting the inner side of the end of the front wall plate. The depth of the cylinder pin assembly compartment in the front-rear direction is set to be wider at the bottom and narrower at the top. The upper part of the front wall plate is bent backward.

10. A loader, characterized in that, The quick-change device has any one of claims 1 to 9.

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