A skid steer loader implement quick change system and method of controlling the same

Abstract

The application discloses a kind of skid loader accessory quick change system and its control method, comprising: including first hydraulic pump, second hydraulic pump, overflow valve, quick change valve, quick change oil cylinder, first electric control reversing valve, safety valve, quick change connector block, clamping cylinder, second electric control reversing valve, proximity switch, accessory and hydraulic oil tank;When like hydraulic breaking hammer, need to change when the accessory such as milling machine and the like hydraulic power, operator does not need to get off the car throughout, different function accessories can be realized quick change at the same time, and automatic switching is carried out to hydraulic oil circuit.The whole accessory replacement process is simple, safe and reliable, which significantly reduces labor intensity and improves work efficiency;On the other hand, based on the structural characteristics of split quick change frame, the connection size of the two ends of the quick change frame can be matched and designed according to the specific machine and implement, to realize the compatibility and universality of existing machine products and implement products, and further expand the application range.

Description

Technical Field

[0001] This invention relates to the field of hydraulic systems, and more particularly to a skid steer loader attachment quick-change system and its control method. Background Technology

[0002] A skid steer loader is a wheeled specialized chassis equipment that uses the difference in linear speed between the wheels on both sides to achieve vehicle steering. It is mainly used in situations where the work area is confined, the ground is uneven, and the work content changes frequently. Skid steer loaders are equipped with a variety of attachments, such as sweepers, milling machines, hydraulic breakers, snow blowers, and tree transplanters, to meet different working conditions. The machine is also equipped with a quick-change attachment system to improve the main unit's working efficiency and operational flexibility. Existing attachment quick-change devices are divided into two types: mechanical quick-change and hydraulic quick-change. The difference lies in that mechanical quick-change uses a mechanical structure and is manually operated by a quick-change lever to lock and separate the attachment from the quick-change frame, while hydraulic quick-change uses the action of the quick-change cylinder to lock and separate the attachment from the quick-change frame. Compared with mechanical quick-change, the advantage is that the operator can load and unload the attachment without leaving the vehicle, which improves convenience and safety. However, most of the attachments of skid steer loaders require an additional oil source to drive the relevant actuators to operate. Therefore, the above-mentioned quick-change devices cannot achieve automatic connection and disconnection of the oil circuit while loading and unloading the attachment. The operator still needs to leave the vehicle to manually connect and disconnect the oil pipes, and the convenience of changing the attachment as a whole still needs to be improved. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a quick-change attachment system and control method for skid steer loaders. This system enables rapid replacement of attachments with different functions, and automatically switches the hydraulic circuits for attachments requiring hydraulic power, such as hydraulic breakers and milling machines. This makes the entire attachment changing process simple, safe, and reliable, improving the working efficiency of skid steer loaders.

[0004] To address the problems of existing technologies, this invention discloses a quick-change attachment system for a skid steer loader, comprising: a first hydraulic pump, a second hydraulic pump, an overflow valve, a quick-change valve, a quick-change cylinder, a first electrically controlled directional valve, a safety valve, a quick-change connector block, a clamping cylinder, a second electrically controlled directional valve, a proximity switch, attachments, and a hydraulic oil tank; the outlet of the first hydraulic pump is connected to the inlet of the quick-change valve, the second electrically controlled directional valve, and the overflow valve, respectively; the quick-change cylinder is connected to the quick-change valve; and the clamping cylinder is connected to the second electrically controlled directional valve. The proximity switch is used to detect the extension and retraction of the quick-change cylinder, thereby controlling the second electrically controlled directional valve to be energized and reversed; the oil outlet of the second hydraulic pump is connected to the safety valve and the oil inlet of the first electrically controlled directional valve, and the oil outlet of the first electrically controlled directional valve is connected to the attachment through the quick-change connector block. The oil circuit of the quick-change connector block is controlled by the action of the clamping cylinder; the oil inlets of the first and second hydraulic pumps, as well as the relief valve, quick-change valve, safety valve, electrically controlled directional valve, and the return port of the electrically controlled directional valve are all connected to the hydraulic oil tank.

[0005] Furthermore, it also includes a quick-change bracket for the whole machine end and a quick-change bracket for the attachment end; the quick-change connector block is divided into two parts: a connector block for the whole machine end installed on the quick-change bracket for the whole machine end and a connector block for the attachment end installed on the quick-change bracket for the attachment end.

[0006] Furthermore, the machine end connector block has a built-in machine end first check valve and a machine end second check valve; the attachment end connector block has a built-in attachment end first check valve and an attachment end second check valve.

[0007] Furthermore, locking pins are provided on both sides of the quick-change frame at the machine end, and the locking pins on both sides are respectively connected to quick-change cylinders. When the piston rod of the quick-change cylinder extends, the locking pin extends under the thrust of the piston rod, and the machine end and the attachment end are locked. When the piston rod of the quick-change cylinder retracts, the locking pin retracts under the pull of the piston rod, and the machine end and the attachment end are unlocked.

[0008] Accordingly, a control method for a skid steer loader attachment quick-change system:

[0009] After the machine is started, when a new attachment needs to be assembled, the solenoid of the quick-change valve is energized, and the quick-change valve operates in the left position. Oil supplied by the first hydraulic pump enters the rod chamber of the quick-change cylinder. As the piston rod of the quick-change cylinder retracts, it pulls the locking pin shaft upwards until it reaches the limit, releasing the locking state. The quick-change frame at the machine end is then aligned with the quick-change frame at the attachment end, ensuring that the locking pin shaft of the machine end quick-change frame corresponds to the mounting hole of the attachment end quick-change frame. At this time, the solenoid of the quick-change valve is energized, and oil supplied by the first hydraulic pump enters the rodless chamber of the quick-change cylinder through the quick-change valve. As the piston rod of the quick-change cylinder extends, it pulls the locking pin shaft downwards until it reaches the limit, entering the locking state. In the stopped state, the proximity switch detects that the piston rod of the quick-change cylinder has reached the limit position. The solenoid of the second solenoid valve is energized, causing the second solenoid valve to operate in the right position. The oil supplied by the first hydraulic pump enters the rod chamber of the clamping cylinder through the second solenoid valve, pushing the piston rod of the clamping cylinder to move against the spring force, so that the machine end connector block and the attachment end connector block are pressed together. This connects the first check valve of the machine end and the first check valve of the attachment end, and at the same time connects the second check valve of the machine end and the second check valve of the attachment end, realizing the oil circuit conduction between the machine end connector block and the attachment end connector block. At this time, the movement control of the attachment is achieved by controlling the energization of the solenoids on both sides of the solenoid valve.

[0010] Accordingly, a control method for a skid steer loader attachment quick-change system:

[0011] When the attachment needs to be removed, both solenoids of the first solenoid valve are de-energized, and the first solenoid valve operates in the neutral position. The oil supplied by the second hydraulic pump returns to the hydraulic oil tank through the first solenoid valve, energizing the solenoid of the quick-change valve, and the quick-change valve operates in the right position. The oil supplied by the first hydraulic pump enters the rod chamber of the quick-change cylinder. As the piston rod of the quick-change cylinder retracts, it pulls the locking pin shaft upward until it reaches the limit, releasing the locking state. The proximity switch detects the extended position of the piston rod of the quick-change cylinder, de-energizing the solenoid of the second solenoid valve, and the second solenoid valve operates in the left position. Under the action of the spring force, the piston rod of the clamping cylinder extends, causing the quick-change connector block to separate. This disconnects the first check valve at the machine end and the first check valve at the attachment end, and both are in the closed port state. At the same time, it disconnects the second check valve at the machine end and the second check valve at the attachment end, and both are in the closed port state.

[0012] The beneficial effects of this invention are as follows: Compared with skid steer loaders equipped with mechanical or hydraulic quick-change attachments, skid steer loaders equipped with the fully automatic attachment quick-change system provided by this invention have the advantage that, when changing attachments requiring hydraulic power, such as hydraulic breakers and milling machines, the operator does not need to leave the vehicle throughout the entire process. Different functional attachments can be quickly changed while the hydraulic circuits are automatically switched. This makes the entire attachment changing process simple, safe, and reliable, significantly reducing labor intensity and improving work efficiency. Furthermore, based on the structural characteristics of the split quick-change frame, the connection dimensions of both ends of the quick-change frame can be designed to match the specific machine and attachments, achieving compatibility and universality with existing machine and attachment products, further expanding the application range. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the system principle of the present invention;

[0014] Figure 2 This is a schematic diagram of the installation of the split quick-change frame in this invention;

[0015] Figure 3 This is a schematic diagram of the quick-change frame at the end of the machine in the locked state of the machine and attachments in this invention;

[0016] Figure 4 This is a schematic diagram of the quick-change frame at the end of the machine in the unlocked state of the machine and its attachments in this invention.

[0017] Figure label:

[0018] 1. First hydraulic pump; 2. Second hydraulic pump; 3. Relief valve; 4. Quick-change valve; 5. Quick-change cylinder; 6. First electrically controlled directional valve; 7. Safety valve; 8. Quick-change connector block; 8-1. Machine end connector block; 8-2. Attachment end connector block; 8-1-A. Machine end first check valve; 8-1-B. Machine end second check valve; 8-2-A. Attachment end first check valve; 8-2-B. Attachment end second check valve; 9. Clamping cylinder; 10. Second electrically controlled directional valve; 11. Proximity switch; 12. Attachment; 13. Hydraulic oil tank; a. Skid steer loader; b. Machine end quick-change frame; c. Attachment end quick-change frame; d. Bucket attachment. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0020] like Figure 1As shown, a skid steer loader attachment quick-change system of the present invention includes: a first hydraulic pump 1, a second hydraulic pump 2, an overflow valve 3, a quick-change valve 4, a quick-change cylinder 5, a first electrically controlled directional valve 6, a safety valve 7, a quick-change connector block 8, a clamping cylinder 9, a second electrically controlled directional valve 10, a proximity switch 11, an attachment 12, and a hydraulic oil tank 13; the oil outlet of the first hydraulic pump 1 is connected to the oil inlet of the quick-change valve 4, the second electrically controlled directional valve 10, and the overflow valve 3, respectively; the quick-change cylinder 5 is connected to the quick-change valve 4; the clamping cylinder 9 is connected to the second electrically controlled directional valve 10; and the proximity switch 11... 11 is used to detect the extension and retraction of the quick-change cylinder 5, thereby controlling the second electrically controlled directional valve 10 to be energized and reversed; the oil outlet of the second hydraulic pump 2 is connected to the oil inlet of the safety valve 7 and the first electrically controlled directional valve 6, and the oil outlet of the first electrically controlled directional valve 6 is connected to the attachment 12 through the quick-change connector block 8. The oil circuit of the quick-change connector block 8 is controlled by the action of the clamping cylinder 9; the oil inlet of the first hydraulic pump 1 and the second hydraulic pump 2, as well as the oil return ports of the overflow valve 3, quick-change valve 4, safety valve 7, electrically controlled directional valve 6, and electrically controlled directional valve 10 are all connected to the hydraulic oil tank 13.

[0021] like Figure 2 As shown, the skid steer loader attachment quick-change system of the present invention adopts a split quick-change frame structure, including a machine-end quick-change frame b and an attachment-end quick-change frame c. The machine-end quick-change frame b is located on the skid steer loader a, and the attachment-end quick-change frame c is connected to the bucket attachment d. The quick-change connector block 8 is divided into two parts: a machine-end connector block 8-1 installed on the machine-end quick-change frame b and an attachment-end connector block 8-2 installed on the attachment-end quick-change frame c. The machine-end connector block 8-1 has a built-in machine-end first one-way valve 8-1-A and a machine-end second one-way valve 8-1-B. The attachment-end connector block 8-2 has a built-in attachment-end first one-way valve 8-2-A and an attachment-end second one-way valve 8-2-B.

[0022] When the machine is not equipped with any attachments, and an attachment similar to a hydraulic breaker that requires an oil source needs to be installed, the electromagnet 4-B of the quick-change valve 4 is energized, and the quick-change valve 4 operates in the left position. The oil supplied by the first hydraulic pump 1 enters the rod chamber of the quick-change cylinder 5. As the piston rod of the quick-change cylinder 5 retracts, it pulls the locking pin b-1 upward until it reaches the limit position, entering the unlocked state. The operator controls the movement of the entire machine and the actions of the boom and bucket to align the position of the quick-change frame b of the machine with the quick-change frame c of the attachment end, which is assembled with the attachment. This ensures that the position of the locking pin b-1 of the quick-change frame b of the machine end corresponds to the mounting hole of the quick-change frame c of the attachment end. At the same time, the quick-change connector block 8, due to its guide post and positioning pin structure, is also in a floating contact state with the attachment. At this time, the solenoid 4-A of the quick-change valve 4 is energized, and the oil supplied by the first hydraulic pump 1 enters the rodless chamber of the quick-change cylinder 5 through the quick-change valve 4. As the piston rod of the quick-change cylinder 5 extends, it pulls the locking pin b-1 down until it reaches the limit and enters the locking state. At this time, the proximity switch 11 detects that the piston rod of the quick-change cylinder 5 has reached the limit state and controls the solenoid of the second solenoid valve 10 to be energized, so that the second solenoid valve 10 works in the right position, and the oil supplied by the hydraulic pump 1... The hydraulic fluid enters the rod chamber of the clamping cylinder 9 through the second electrically controlled directional valve 10, pushing the piston rod of the clamping cylinder 9 to move against the spring force. This causes the machine end connector block 8-1 and the attachment end connector block 8-2 to fit together, connecting the machine end first check valve 8-1-A and the attachment end first check valve 8-2-A, and simultaneously connecting the machine end second check valve 8-1-B and the attachment end second check valve 8-2-B, thus achieving oil circuit connection between the machine end connector block 8-1 and the attachment end connector block 8-2. At this time, by controlling the energization of the electromagnets 6-A and 6-B on both sides of the electrically controlled directional valve 6, the movement control of the newly assembled attachment can be achieved.

[0023] When the operator needs to remove the attachment, the electromagnets 6-A and 6-B on both sides of the first electrically controlled directional valve 6 are de-energized, and the first electrically controlled directional valve 6 operates in the neutral position. The oil supplied by the hydraulic pump 2 returns to the hydraulic oil tank 13 through the first electrically controlled directional valve 6. Then, the electromagnet 4-B of the quick-change valve 4 is energized, and the quick-change valve 4 operates in the right position. The oil supplied by the hydraulic pump 1 enters the rod chamber of the quick-change cylinder 5. As the piston rod of the quick-change cylinder 5 retracts, it pulls the locking pin b-1 upward until it reaches the limit and enters the unlocked state. At the same time, proximity switch 11 detects the extended position of piston rod of quick-change cylinder 5, de-energizing the electromagnet of second electric directional valve 10. Second electric directional valve 10 operates in the left position, and the piston rod of clamping cylinder 9 extends under the action of spring force, causing quick-change connector block 8 to return to the floating contact state and tend to separate. This disconnects the first one-way valve 8-1-A at the whole machine end and the first one-way valve 8-2-A at the attachment end, and puts them in the oil port closed state. At the same time, it disconnects the second one-way valve 8-1-B at the attachment end and the second one-way valve 8-2-B at the attachment end, and puts them in the oil port closed state. The oil circuit of attachment 12 is disconnected from the oil source of the whole machine. The operator controls the movement of the whole machine and the boom and bucket movements to separate the quick-change frame b at the whole machine end from the quick-change frame c at the attachment end, which is assembled with the attachment. This achieves the disconnection of the oil circuit and reliable sealing at the same time as attachment disassembly.

[0024] When the machine with attachments is stopped and the engine is turned off, the solenoids 4-A and 4-B of the quick-change valve 4 are de-energized, and the quick-change valve 4 operates in the neutral position. The hydraulic lock of the quick-change cylinder 5 in the quick-change valve 4 keeps the cylinder extended to its limit position, keeping the machine and attachments locked and ensuring a reliable connection between the machine and attachments. At the same time, since the solenoid of the second electrically controlled directional valve 10 is de-energized, the second electrically controlled directional valve 10 operates in the left position. The rod chamber of the clamping cylinder 9 is connected to the hydraulic oil tank 13. Under the action of the spring force, the clamping cylinder 9... The piston rod extends, causing the quick-connect coupling block 8 to return to the floating contact state and tend to separate. This disconnects the first check valve 8-1-A at the machine end and the first check valve 8-2-A at the attachment end, and both are in a closed oil port state. At the same time, it disconnects the second check valve 8-1-B at the machine end and the second check valve 8-2-B at the attachment end, and both are in a closed oil port state. The quick-connect coupling block 8 remains sealed under the action of the check valves, thus separating the oil circuit of the attachment 12 from the oil source of the machine and preventing accidental operation when the machine is stopped and the engine is off.

[0025] When the machine is stopped and turned off after operation with attachments, and then restarted, the quick-change cylinder 5, with the hydraulic lock in the quick-change valve 4, remains extended to its limit position, keeping the machine and attachments locked. At this time, the proximity switch 11 detects that the quick-change cylinder 5 is extended to its limit position, and then controls the electromagnet of the second solenoid valve 10 to be energized. The second solenoid valve 10 operates in the right position, and the oil supplied by the first hydraulic pump 1 enters the rod chamber of the clamping cylinder 9 through the second solenoid valve 10, pushing the piston rod of the clamping cylinder 9 to move against the spring force, so that the machine end connector block 8-1 and the attachment end connector block 8-2 are pressed together, connecting the first check valve 8-1-A of the machine end and the first check valve 8-2-A of the attachment end, and simultaneously connecting the second check valve 8-1-B of the machine end and the second check valve 8-2-B of the attachment end, thus realizing the oil circuit connection between the machine end connector block 8-1 and the attachment end connector block 8-2. At this point, by controlling the energization of the electromagnets 6-A and 6-B on both sides of the electrically controlled directional valve 6, the motion control of the newly assembled attachment can be achieved.

[0026] To elaborate further, in combination Figure 3 and Figure 4 The quick-change bracket shown is in two different working states: connecting to attachments and disconnecting from attachments. Figure 3 The diagram shows the working state of the quick-change frame at the machine end with the whole machine and attachments locked. The quick-change cylinder 5 is in the extended state, and the locking pin b-1 is connected to both ends of the quick-change cylinder 5. Under the thrust of the quick-change cylinder 5, the locking pin b-1 is extended, i.e., locked. As described above: at this time, the proximity switch 11 detects that the quick-change cylinder 5 is extended to its limit position, thereby energizing the solenoid of the second electrically controlled directional valve 10. The second electrically controlled directional valve 10 operates in the right position, and the oil supplied by the first hydraulic pump 1 flows through the second electrically controlled directional valve 10. 0 enters the rod chamber of clamping cylinder 9, pushing the piston rod of clamping cylinder 9 to move against the spring force, so that the machine end connector block 8-1 and the attachment end connector block 8-2 are pressed together, so that the first one-way valve 8-1-A of the machine end and the first one-way valve 8-2-A of the attachment end are connected, and at the same time, the second one-way valve 8-1-B of the machine end and the second one-way valve 8-2-B of the attachment end are connected, so as to realize the oil circuit conduction of the machine end connector block 8-1 and the attachment end connector block 8-2, and then transmit the machine oil source to the attachment end actuator to complete the corresponding attachment working condition operation;

[0027] Figure 4The diagram shows the working state of the quick-change frame at the machine end when the machine and attachment are unlocked. The quick-change cylinder 5 is in the retracted state, and the locking pin b-1 is connected to both ends of the quick-change cylinder 5. Under the pulling force of the quick-change cylinder 5, the locking pin b-1 retracts, i.e., the lock is released. Simultaneously, the proximity switch 11 detects the extended position of the piston rod of the quick-change cylinder 5, de-energizing the electromagnet of the first electrically controlled directional valve 10. The first electrically controlled directional valve 10 operates in the left position, and the piston rod of the clamping cylinder 9 extends under the spring force, causing the quick-change connector block 8 to return to the floating contact state and tend to separate. This disconnects the first one-way valve 8-1-A at the machine end and the first one-way valve 8-2-A at the attachment end, and both are in a closed port state. Simultaneously, the machine... The second check valve 8-1-B at the end and the second check valve 8-2-B at the attachment end are disconnected and each is in a closed oil port state; the oil circuit of the attachment 12 is disconnected from the oil source of the whole machine. The operator controls the movement of the whole machine and the boom and bucket movements to separate the quick change frame b at the end of the whole machine from the quick change frame c at the end of the attachment assembly, so that the oil circuit is disconnected and reliably sealed at the same time as the attachment is disassembled; or after the whole machine stops and the engine is turned off while operating with the attachment, the electromagnets 4-A and 4-B of the quick change valve 4 are not energized, the quick change valve 4 works in the neutral position, and the hydraulic lock of the quick change cylinder 5 in the quick change valve 4 is in effect, keeping the cylinder extended to the limit position, so that the whole machine and the attachment are still locked. At the same time, the quick change connector block 8 is kept sealed under the action of the check valve to prevent misoperation in the state of stopping and turning off the engine.

[0028] Based on the above examples, skid steer loaders using the fully automatic attachment quick-change system of this invention can achieve rapid replacement of different functional attachments while automatically switching hydraulic circuits under their common operating conditions, without the operator needing to leave the vehicle. Simultaneously, in the stopped and engine-off state, it can reliably lock the attachments and cut off the attachment hydraulic circuits to prevent accidental operation during shutdown; making the entire attachment replacement process simple, safe, and reliable, significantly reducing labor intensity and improving work efficiency. Furthermore, based on the structural characteristics of the split quick-change frame, the connection dimensions of both ends of the quick-change frame can be designed to match the specific machine and attachments, achieving compatibility and universality with existing machine and attachment products, further expanding the application scope.

[0029] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, such as integrating the overflow valve 3 into the first hydraulic pump 1, or integrating the second electrically controlled directional valve 10 into the quick-change valve 4, etc. These improvements and modifications should also be considered within the scope of protection of the present invention.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and 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, and therefore should not be construed as a limitation of the invention. Furthermore, in the accompanying drawings of this invention, the fill patterns are only for distinguishing layers and do not constitute any other limitation.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A skid steer loader implement quick change system characterized by, The utility model relates to a kind of quick-change systems of sliding loader accessory, including: Including first hydraulic pump (1), second hydraulic pump (2), overflow valve (3), quick-change valve (4), quick-change oil cylinder (5), first electric control reversing valve (6), safety valve (7), quick-change connector block (8), clamping oil cylinder (9), second electric control reversing valve (10), proximity switch (11), tool (12) and hydraulic oil tank (13);First hydraulic pump (1) oil outlet is connected with quick-change valve (4), second electric control reversing valve (10), overflow valve (3) oil inlet respectively, quick-change oil cylinder (5) connects quick-change valve (4), clamping oil cylinder (9) connects second electric control reversing valve (10), proximity switch (11) is used to detect the extension and retraction action of quick-change oil cylinder (5), to control second electric control reversing valve (10) in turn power direction change;Second hydraulic pump (2) oil outlet is connected with safety valve (7), first electric control reversing valve (6) oil inlet, and the oil outlet of first electric control reversing valve (6) is connected with tool (12) by quick-change connector block (8), and the oil circuit of quick-change connector block (8) is controlled by the action of clamping oil cylinder (9);The oil suction of first hydraulic pump (1) and second hydraulic pump (2) and the oil return of overflow valve (3), quick-change valve (4), safety valve (7), first electric control reversing valve (6), second electric control reversing valve (10) are connected with hydraulic oil tank (13); Still including whole machine end quick-change frame (b) and tool end quick-change frame (c);The quick-change connector block (8) is divided into two parts: whole machine end connector block (8-1) installed in whole machine end quick-change frame (b) and tool end connector block (8-2) installed in tool end quick-change frame (c); Whole machine end connector block (8-1) is built-in whole machine end first check valve (8-1-A) and whole machine end second check valve (8-1-B);Tool end connector block (8-2) is built-in tool end first check valve (8-2-A) and tool end second check valve (8-2-B).

2. A skid steer implement quick change system as described in Claim 1, wherein, The both sides of the whole machine end quick-change frame (b) are respectively equipped with locking pin shaft (b-1), and the locking pin shaft (b-1) of both sides is connected with quick-change oil cylinder (5), when the piston rod of quick-change oil cylinder (5) extends, the locking pin shaft (b-1) extends under the thrust of piston rod, and the whole machine end is locked with tool end;When the piston rod of quick-change oil cylinder (5) retracts, the locking pin shaft (b-1) retracts under the tension of piston rod, and the whole machine end is unlocked with tool end.

3. The control method of the quick-change system of sliding loader accessory according to claim 2, characterized in that: When the machine is started, the electromagnet 4-B of the quick-change valve (4) is powered to make the quick-change valve (4) work in the right position, and the oil provided by the first hydraulic pump (1) enters the rod cavity of the quick-change oil cylinder (5). With the retraction of the piston rod of the quick-change oil cylinder (5), the locking pin shaft (b-1) is pulled up until it reaches the limit, and the locking state is released. The machine end quick-change frame (b) is positioned with the accessory end quick-change frame (c) which is assembled with the accessory, so that the locking pin shaft (b-1) of the machine end quick-change frame (b) corresponds to the mounting hole of the accessory end quick-change frame (c). At this time, the electromagnet 4-A of the quick-change valve (4) is powered, and the oil provided by the first hydraulic pump (1) enters the rodless cavity of the quick-change oil cylinder (5) through the quick-change valve (4). With the extension of the piston rod of the quick-change oil cylinder (5), the locking pin shaft (b-1) is pulled down until it reaches the limit, and enters the locking state. At this time, the proximity switch (11) detects that the piston rod of the quick-change oil cylinder (5) reaches the limit state, the electromagnet of the second electric control reversing valve (10) is powered, and the second electric control reversing valve (10) works in the right position. The oil provided by the first hydraulic pump (1) enters the rod cavity of the clamping oil cylinder (9) through the second electric control reversing valve (10), and the piston rod of the clamping oil cylinder (9) moves against the spring force, so that the machine end connector block (8-1) and the accessory end connector block (8-2) are tightly attached, the machine end first one-way valve (8-1-A) and the accessory end first one-way valve (8-2-A) are communicated, and the machine end second one-way valve (8-1-B) and the accessory end second one-way valve (8-2-B) are communicated, realizing the oil path conduction of the machine end connector block (8-1) and the accessory end connector block (8-2). At this time, the action control of the accessory (12) is realized by controlling the power of the electromagnets on both sides of the first electric control reversing valve (6).

4. The control method of the quick-change system of the skid loader accessory according to claim 2, characterized in that: When the tool needs to be removed, the electromagnet on both sides of the first electrically controlled reversing valve (6) is de-energized, the first electrically controlled reversing valve (6) works in the middle position, the oil provided by the second hydraulic pump (2) returns to the hydraulic oil tank (13) through the first electrically controlled reversing valve (6), the electromagnet 4-B of the quick-change valve (4) is energized, the quick-change valve (4) works in the right position, the oil provided by the first hydraulic pump (1) enters the rod cavity of the quick-change oil cylinder (5), as the piston rod of the quick-change oil cylinder (5) retracts, the locking pin shaft (b-1) is pulled up, until it reaches the limit, the locking state is released; the proximity switch (11) detects the extension position of the piston rod of the quick-change oil cylinder (5), the electromagnet of the second electrically controlled reversing valve (10) is de-energized, the second electrically controlled reversing valve (10) works in the left position, the piston rod of the clamping oil cylinder (9) extends under the action of the spring force, the quick-change joint block (8) is separated, and then the machine end first one-way valve (8-1-A) and the tool end first one-way valve (8-2-A) are disconnected and respectively in the oil port closed state, at the same time, the machine end second one-way valve (8-1-B) and the tool end second one-way valve (8-2-B) are disconnected and respectively in the oil port closed state.

Images