Mechanical control device of skid steer loader

Abstract

The invention belongs to the technical field of skid steer loaders, and relates to a mechanical control device of a skid steer loader, which comprises two handles, the two handles are operated front and back to control the servo plunger pump so as to control walking and steering of the skid steer loader; the multi-way valve is in transmission connection with the two handles, and the two handles are operated leftwards and rightwards to control the multi-way valve so as to control a bucket of the skid loader to ascend, descend and turn over; the servo plunger pump comprises a reset mechanism, the reset mechanism comprises a limiting support, an elastic element and two pull rods in transmission connection with the two handles respectively, the two pull rods are arranged on the limiting support in a sliding mode, the pull rods are provided with limiting mechanisms for limiting the strokes of the pull rods on the limiting support, and the elastic element is arranged between the pull rods and the limiting support. The maximum vehicle speed can be directly adjusted by adjusting the position of the limiting mechanism on the pull rod, the maximum vehicle speed can be adjusted according to habits or working conditions of different operators, and then operation flexibility, comfort and safety are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of skid steer loaders, and in particular relates to a mechanical operating device for a skid steer loader. Background Art

[0002] The existing skid steer loader operating mechanisms are mainly divided into two-hand mechanical operation, one-hand hydraulic pilot operation and one-hand electric control operation. The two-hand mechanical operation is more in line with the operator's operating habits. Due to the different models of mechanical equipment, the maximum forward and reverse speeds are also different, and usually the maximum speed cannot be adjusted, and the operator needs to adapt to different models of equipment. Summary of the invention

[0003] In order to solve the defect that the maximum vehicle speed cannot be adjusted in the prior art, the present invention provides a mechanical control device for a skid loader.

[0004] A mechanical control device for a skid loader includes two handles;

[0005] A servo piston pump, wherein the two handles are operated forward and backward to control the servo piston pump and thus control the travel and steering of the skid loader;

[0006] A multi-way valve is connected to the two handles in a transmission manner. The two handles are operated left and right to control the multi-way valve and thus control the lifting and flipping of the bucket of the skid loader.

[0007] The servo plunger pump includes a reset mechanism, which includes a limit bracket, an elastic element and two pull rods respectively connected to the two handles in a transmission manner. The two pull rods are slidably arranged on the limit bracket, and the pull rod is provided with a limit mechanism for limiting its travel on the limit bracket. The elastic element is arranged between the pull rod and the limit bracket.

[0008] In one embodiment, the limit bracket includes a mounting plate installed on the servo plunger pump, a pair of relatively arranged supports are fixedly arranged on the mounting plate, the pull rod passes through the two supports and is slidably connected to the supports, and the limit mechanism is arranged at both ends of the pull rod.

[0009] In one embodiment, the limiting mechanism is a limiting nut, and the limiting nut is threadedly connected to the pull rod.

[0010] In one embodiment, the elastic element is a spring, the spring is sleeved on the pull rod, and the spring is located between the two supports.

[0011] In one embodiment, two springs are arranged on each of the pull rods, an adjustment seat is arranged between the two springs, the adjustment seat is threadedly connected to the pull rod, one end of the spring abuts against the adjustment seat, and the other end abuts against the support.

[0012] In one embodiment, it also includes an operating mechanism connected to the two handles respectively, and the operating mechanism includes a first connecting rod and a second connecting rod. The forward and backward operation of the handle can drive the first connecting rod to rise or fall, and the left and right operation of the handle can drive the second connecting rod to rise or fall. The first connecting rod is connected to the pull rod transmission, and the second connecting rod is connected to the multi-way valve transmission.

[0013] In one embodiment, the operating mechanism further comprises a first operating rod perpendicular to the first connecting rod and a second operating rod perpendicular to the second connecting rod, both ends of the first operating rod and the second operating rod are rotatably arranged on a fixed frame; both ends of the first operating rod and the second operating rod are fixed with swing arms;

[0014] A swing arm at one end of the first joystick is connected to the first connecting rod through a joint bearing, and a swing arm at the other end is connected to the first control rod through a joint bearing, the first control rod is connected to one end of a rotating arm through a joint bearing, and the other end of the rotating arm is connected to the pull rod through a joint bearing, and the rotating arm is rotatably arranged on the servo plunger pump;

[0015] A swing arm at one end of the second operating rod is connected to the second connecting rod through a joint bearing, and a swing arm at the other end is connected to the second control rod through a joint bearing, and the other end of the second control rod is connected to the multi-way valve.

[0016] Beneficial effects: The present invention can control the movement stroke of the pull rod through a limit mechanism. Since the pull rod is directly connected to control the servo plunger pump, the maximum stroke of the pull rod is directly related to the maximum vehicle speed. By adjusting the position of the limit mechanism on the pull rod, the maximum vehicle speed can be directly adjusted. The maximum vehicle speed can be adjusted according to the habits or working conditions of different operators, thereby improving operational flexibility, comfort and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the operating device mechanism;

[0018] Figure 2 This is a schematic diagram of the servo plunger pump control structure;

[0019] Figure 3 It is a schematic diagram of the multi-way valve operating structure;

[0020] Figure 4 It is a schematic diagram of the structure of the servo plunger pump and the reset mechanism;

[0021] In the figure, 101. left handle, 102. right handle, 200. servo plunger pump, 300. multi-way valve, 11. first connecting rod, 12. first operating rod, 13. first control rod, 14. pull rod, 15. spring, 16. rotating arm, 17. mounting plate, 18. support, 19. limit nut, 191. adjustment seat, 21. second connecting rod, 22. second operating rod, 23. second control rod, 30. fixing bracket, 40. swing arm. DETAILED DESCRIPTION

[0022] The present application will be further described below in conjunction with specific implementation methods. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative changes belong to the protection scope of the present application.

[0023] like Figure 1 , 2 As shown in 4, a mechanical control device for a skid loader includes two handles;

[0024] A servo piston pump 200, wherein the two handles are operated forward and backward to control the servo piston pump 200 and thus control the travel and steering of the skid loader;

[0025] The multi-way valve 300 is in transmission connection with the two handles. The two handles are operated left and right to control the multi-way valve 300 and thus control the lifting and flipping of the bucket of the skid loader.

[0026] The servo plunger pump 200 includes a reset mechanism, which includes a limit bracket, an elastic element and two pull rods 14 respectively connected to the two handles in a transmission manner. The two pull rods 14 are slidably arranged on the limit bracket, and a limit mechanism is arranged on the pull rod 14 to limit its travel on the limit bracket. The elastic element is arranged between the pull rod 14 and the limit bracket.

[0027] The two handles are respectively a left handle 101 and a right handle 102. The two handles can be used to control the forward, backward, turning, lifting and flipping of the loader, and the lifting and flipping of the bucket. Compared with the operation of using hands and feet, manual mechanical operation is more in line with the operator's operating habits, simple to operate, and not prone to operating errors. In addition, the present invention is also provided with a limit mechanism, which can control the stroke of the pull rod 14, that is, control the output flow of the servo plunger pump 200, that is, control the maximum speed of the vehicle, and adjust the maximum speed according to different operators or working conditions, which can improve the driving comfort and safety. In addition, the elastic element can realize that when the handle is not operated, the handle is automatically reset to the middle position, and a feedback rod is added when the handle is operated, that is, the operator will feel a reaction force when the handle is deflected forward and backward, which can avoid operating errors and improve the comfort of operation.

[0028] like Figure 4 As shown, in one embodiment, the position limiting bracket includes a mounting plate 17 mounted on the servo piston pump 200, a pair of oppositely arranged supports 18 are fixedly arranged on the mounting plate 17, the tie rod 14 passes through the two supports 18 and is slidably connected with the supports 18, and the position limiting mechanism is arranged at both ends of the tie rod 14. Specifically, a mounting hole can be opened on the support 18, the tie rod 14 passes through the two supports 18, and the position limiting mechanism is arranged on the tie rod 14 protruding outside the two supports 18.

[0029] like Figure 4 As shown, specifically, in one embodiment, the limiting mechanism is a limiting nut 19, and the limiting nut 19 is threadedly connected to the pull rod 14. The threaded connection is convenient for adjustment, and the stroke of the pull rod 14 can be effectively controlled by adjusting the limiting nut 19. Of course, other methods can also be used in other embodiments, and the present invention is not limited thereto.

[0030] like Figure 4 As shown, specifically, in one embodiment, the elastic element is a spring 15, and the spring 15 is sleeved on the pull rod 14, and the spring 15 is located between the two supports 18. In addition to the elastic element in the form of the spring 15, other forms of elastic elements, such as elastic rubber materials, etc., can also be used.

[0031] like Figure 4 As shown, in one embodiment, two springs 15 are arranged on each pull rod 14, and an adjustment seat 191 is arranged between the two springs 15. The adjustment seat 191 is threadedly connected to the pull rod 14, and one end of the spring 15 abuts on the adjustment seat 191, and the other end abuts on the support 18. By adjusting the adjustment seat 191, the force required when the handle is operated forward and backward can be adjusted, so that the operator can get a more comfortable driving experience.

[0032] like Figures 1 to 3 As shown, in one embodiment, in order to realize the transmission connection between the handle and the servo plunger pump 200 and the multi-way valve 300, the operating device also includes an operating mechanism connected to the two handles respectively, and the operating mechanism includes a first connecting rod 11 and a second connecting rod 21. The forward and backward operation of the handle can drive the first connecting rod 11 to rise or fall, and the left and right operation of the handle can drive the second connecting rod 21 to rise or fall. The first connecting rod 11 is transmission-connected to the pull rod 14, and the second connecting rod 21 is transmission-connected to the multi-way valve 300. The handle can realize both forward and backward operation and left and right operation, which is a common technical means in the field and will not be repeated in this application.

[0033] like Figures 1 to 3As shown, specifically, the operating mechanism further includes a first operating rod 12 perpendicular to the first connecting rod 11 and a second operating rod 22 perpendicular to the second connecting rod 21, both ends of the first operating rod 12 and the second operating rod 22 are rotatably arranged on a fixing frame 30; both ends of the first operating rod 12 and the second operating rod 22 are fixed with swing arms 40;

[0034] A swing arm 40 at one end of the first operating lever 12 is connected to the first connecting rod 11 through a joint bearing, and the swing arm 40 at the other end is connected to the first control rod 13 through a joint bearing, and the first control rod 13 is connected to one end of a rotating arm 16 through a joint bearing, and the other end of the rotating arm 16 is connected to the pull rod 14 through a joint bearing, and the rotating arm 16 is rotatably arranged on the servo plunger pump 200;

[0035] The swing arm 40 at one end of the second operating rod 22 is connected to the second connecting rod 21 through a joint bearing, and the swing arm 40 at the other end is connected to the second control rod 23 through a joint bearing. The other end of the second control rod 23 is connected to the multi-way valve 300.

[0036] In order to reduce wear, bushings may be provided between the fixing bracket 30 and the first operating rod 12 and the second operating rod 22 .

[0037] In order to realize automatic and operational feedback when the handle moves left and right, a return spring 15 may be provided between the second operating rod 22 and the fixing frame 30 .

[0038] The specific transmission method is that the front and rear deflection of the operating handle can drive the first connecting rod 11 to rise and fall. When the first connecting rod 11 rises and falls, it drives the swing arm 40 fixedly connected to one end of the first operating rod 12 to rotate. The rotation of the swing arm 40 can drive the first operating rod 12 to rotate, and then the swing arm 40 at the other end of the first operating rod 12 also rotates, and then drives the first control rod 13 to drive the rotating arm 16 to rotate. The rotating arm 16 drives the pull rod 14 to slide back and forth on the support 18. Finally, the pull rod 14 controls the output flow of the servo plunger pump 200. The larger the stroke of the pull rod 14, the greater the output flow, and the faster the corresponding operation speed of the loader; release the handle, and the pull rod 14 can be reset under the action of the elastic element, and the handle is in the middle position at the same time. The combined operation of the front, rear and middle positions of the left handle 101 and the right handle 102 can realize the forward, backward and steering operations of the loader. The specific combination and the operation mode of the loader are shown in Table 1 below:

[0039] Table 1

[0040]

[0041] Similarly, the left and right deflection of the operating handle can drive the second connecting rod 21 to rise and fall. When the second connecting rod 21 rises and falls, it drives the swing arm 40 fixedly connected to one end of the second operating rod 22 to rotate. The rotation of the swing arm 40 can drive the second operating rod 22 to rotate, and then the swing arm 40 at the other end of the second operating rod 22 also rotates, thereby driving the second control rod 23 to move, and the second control rod 23 controls the valve core of the multi-way valve 300 to move, thereby controlling the movement of the bucket. The combined operation of the left handle 101 and the right handle 102 at the left, right, and middle positions can realize the lifting and flipping of the loader bucket. The specific combination and the operation mode of Zhuangzi Aji are shown in Table 2 below:

[0042] Table 2

[0043]

[0044] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of this application.

Claims

1. A mechanical control device for a skid loader, characterized in that: Includes two handles; A servo piston pump (200), wherein the two handles are operated forward and backward to control the servo piston pump (200) and thus control the travel and steering of the skid loader; A multi-way valve (300) is in driving connection with the two handles, and the two handles are operated left and right to control the multi-way valve (300) and thus control the lifting and turning of the bucket of the skid loader; The servo plunger pump (200) includes a reset mechanism, which includes a limit bracket, an elastic element and two pull rods (14) respectively connected to the two handles in a transmission manner. The two pull rods (14) are slidably arranged on the limit bracket, and a limit mechanism is arranged on the pull rod (14) to limit its travel on the limit bracket. The elastic element is arranged between the pull rod (14) and the limit bracket.

2. The mechanical operating device for a skid steer loader according to claim 1, characterized in that: The limit bracket comprises a mounting plate (17) mounted on the servo plunger pump (200), a pair of relatively arranged supports (18) being fixedly arranged on the mounting plate (17), the pull rod (14) passing through the two supports (18) and being slidably connected to the supports (18), and the limit mechanism is arranged at both ends of the pull rod (14).

3. The mechanical operating mechanism of a skid loader according to claim 1 or 2, characterized in that: The limiting mechanism is a limiting nut (19), and the limiting nut (19) is threadedly connected to the pull rod (14).

4. The mechanical operating device for a skid steer loader according to claim 2, characterized in that: The elastic element is a spring (15), the spring (15) is sleeved on the pull rod (14), and the spring (15) is located between the two supports (18).

5. The mechanical operating device for a skid steer loader according to claim 4, characterized in that: Two springs (15) are arranged on each pull rod (14), an adjustment seat (191) is arranged between the two springs (15), the adjustment seat (191) is threadedly connected to the pull rod (14), one end of the spring (15) abuts against the adjustment seat (191), and the other end abuts against the support (18).

6. The mechanical control device for a skid steer loader according to claim 1, characterized in that: It also includes an operating mechanism connected to the two handles respectively, the operating mechanism includes a first connecting rod (11) and a second connecting rod (21), the handles can be operated forward and backward to drive the first connecting rod (11) to rise or fall, and the handles can be operated left and right to drive the second connecting rod (21) to rise or fall, the first connecting rod (11) is transmission-connected to the pull rod (14), and the second connecting rod (21) is transmission-connected to the multi-way valve (300).

7. The mechanical operating device for a skid steer loader according to claim 6, characterized in that: The operating mechanism further comprises a first operating rod (12) perpendicular to the first connecting rod (11) and a second operating rod (22) perpendicular to the second connecting rod (21); both ends of the first operating rod (12) and the second operating rod (22) are rotatably arranged on a fixing frame (30); and both ends of the first operating rod (12) and the second operating rod (22) are fixed with swing arms (40); A swing arm (40) at one end of the first operating lever (12) is connected to the first connecting rod (11) via a joint bearing, and the swing arm (40) at the other end is connected to the first control lever (13) via a joint bearing, and the first control lever (13) is connected to one end of a rotating arm (16) via a joint bearing, and the other end of the rotating arm (16) is connected to the pull rod (14) via a joint bearing, and the rotating arm (16) is rotatably arranged on the servo piston pump (200); A swing arm (40) at one end of the second operating rod (22) is connected to the second connecting rod (21) via a joint bearing, and the swing arm (40) at the other end is connected to the second control rod (23) via a joint bearing, and the other end of the second control rod (23) is connected to the multi-way valve (300).

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