A centralized control device for a multi-way valve and a forklift

Abstract

The present invention discloses a centralized control device for a multi-way valve, comprising a multi-way valve and a control lever. The control lever is rotatably connected to a steering device through a fixing bracket. The steering device is respectively connected to two valve cores of the multi-way valve through a connecting rod and a spherical eye rod, so that when the control lever rotates around the axis, one of the valve cores is driven to work. The multi-way valve and the steering device are both fixedly installed on a mounting plate. The present invention realizes the movement of the control lever with two degrees of freedom, that is, two valve cores of the multi-way valve can be independently controlled or jointly controlled, which conforms to the forklift operation control logic, simplifies the operation steps, improves the driving comfort, and at the same time has a simple structure, a small volume, a low cost and high reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of forklift manufacturing, and particularly relates to a centralized control device for a multi-way valve and a forklift. Background Art

[0002] The main functions of the multi-way valve control structure of a forklift are to control the lifting and lowering of the fork, the forward and backward tilting of the mast, and the function switching of attachments. The traditional control method uses independent joysticks to control the spools in the multi-way valve, which has low operating efficiency and poor comfort for operating multiple valves. Currently, there is a centralized joystick structure on the market, that is, two spools are controlled by the movement of one joystick with two degrees of freedom. Pushing forward realizes the forward tilt of the mast, pushing backward realizes the backward tilt of the mast, pushing right realizes the lifting of the fork, and pushing left realizes the lowering of the fork. The existing structures are generally realized by using universal joints and sector hinge blocks, and their main disadvantages are as follows:

[0003] 1. The joystick is hinged to the support through a universal joint structure to realize two-degree-of-freedom movement. In order to independently control the two spools of the multi-way valve, a relatively large sector hinge block needs to be connected to the joystick, and it is necessary to ensure that the hinge holes hinged to the control linkages of the two spools are respectively on the front-back rotation axis and the left-right rotation axis, which requires high machining and installation accuracy of parts, and the overall structure is large and complex.

[0004] 2. The linkages for controlling the two spools both use ball hinges and bolts, and are in clearance fit with the sector hinge block, resulting in low control accuracy during combined operation. Summary of the Invention

[0005] The purpose of the present invention is to provide a new centralized control structure for a forklift multi-way valve to solve the problems mentioned in the above background and optimize the product.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A centralized control device for a multi-way valve, comprising a multi-way valve and a joystick. The joystick is rotationally connected to a steering device through a fixing bracket. The steering device is respectively connected to the two spools of the multi-way valve through a connecting rod and a fish-eye rod, so that when the joystick rotates around the axis, it drives one of the spools to work; both the multi-way valve and the steering device are fixedly installed on a mounting plate.

[0008] Further, the steering device includes a mounting bracket fixedly installed on the mounting plate. A rotating bracket is rotationally connected to the mounting bracket, and the fixing bracket is rotationally connected to the rotating bracket; the rotating bracket rotates relative to the mounting bracket, and uses its connection point as the front-back rotation axis; the fixing bracket rotates relative to the rotating bracket, and uses its connection point as the left-right rotation axis.

[0009] In a further solution, the rotating bracket is an S-shaped structure bent into three sections, where the first section and the third section are both perpendicular to the second section. The first section and the second section are respectively rotationally connected to the mounting bracket and the fixed bracket through a rotating mechanism, and the third section of the rotating bracket is hinged to the connecting rod.

[0010] Preferably, mounting holes are provided on all three sections of the rotating bracket.

[0011] In a further solution, the fixed bracket includes an L-shaped plate rotatably connected to the rotating bracket. The horizontal section of the L-shaped plate is rotationally connected to the second section of the rotating bracket through a rotating mechanism. The vertical section of the L-shaped plate is arranged parallel to the first section of the rotating bracket and is hinged to the fish-eye rod; a fixing plate for mounting the control lever is fixed on the L-shaped plate.

[0012] In a further solution, the rotating mechanism includes a pin shaft and a split pin.

[0013] In a further solution, both ends of the connecting rod are hinged to the steering device and the first joint spool of the multi-way valve through pin shafts; both ends of the fish-eye rod are respectively hinged to the steering device and the second spool of the multi-way valve.

[0014] Another object of the present invention of this application is to provide a forklift truck, which includes the centralized control device of the above multi-way valve.

[0015] The steering device composed of the mounting bracket and the rotating bracket in this application forms a multi-link mechanism with the control lever, the connecting rod, and the fish-eye rod. The mounting bracket serves as a fixed end. And due to the relative positional relationship among the mounting bracket, the rotating bracket, and the fixed bracket for fixedly installing the control lever, the rotating bracket rotates relative to the mounting bracket, and uses its connection point as the front-back rotation axis; the fixed bracket rotates relative to the rotating bracket, and uses its connection point as the left-right rotation axis.

[0016] When the control lever is pushed forward and backward, the rotating bracket rotates around the front-back rotation axis, driving the connecting rod to move. The connecting rod, the surface of the rotating bracket, and the spool mounting surface are coplanar, controlling the up and down movement of the first joint spool to realize the forward and backward tilting operations of the forklift mast. At the same time, the rotation angle of the rotating bracket is limited by the stroke of this spool; since the center of the hinge hole of the fish-eye rod and the fixed bracket is on the axis of the front-back rotation axis, the fish-eye rod and the second joint spool will not move when the rotating bracket rotates, realizing the separate control of the spool.

[0017] When the joystick is pushed left and right, the fixed frame rotates around the left and right rotation axes, driving the fish-eye rod to move. The ball hinge end of the fish-eye rod is articulated with the steering device by bolt and nut with clearance fit, leaving a certain clearance between them to avoid interference movement, control the up and down movement of the spool, and realize the lifting and lowering operations of the forklift forks. Since the joystick is articulated with the rotating bracket through the fixed frame, when the joystick rotates left and right, the rotating bracket will not rotate, that is, the connecting rod and the first-stage spool will not move, realizing the independent control of the spool. Similarly, when the joystick is pushed at other angles, it is the combined control of the two spools, realizing the compound operation of the multi-way valve.

[0018] Therefore, the present application realizes the movement of two degrees of freedom of the joystick, that is, it can independently control the two spools of the multi-way valve or can be combined to control, which conforms to the forklift operation control logic, simplifies the operation steps, improves the driving comfort, and at the same time has a simple structure, small volume, low cost and high reliability.

[0019] The present application adopts a multi-link structure to realize the movement of two degrees of freedom of the joystick and the independent and combined control of the two spools. Compared with the combination structure of the universal joint and the sector hinge block of the traditional centralized joystick, the implementation scheme is simpler, greatly reducing the structure volume while improving the reliability of the structure and reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic view of the right side structure of the present invention;

[0021] Figure 2 is a schematic view of the left side structure of the present invention;

[0022] Figure 3 is a schematic view of the installation of the mounting bracket, rotating bracket and fixing plate in the present invention;

[0023] Figure 4 is a schematic view of the rotating bracket structure in the present invention;

[0024] Figure 5 is a schematic view of the rotary axis structure of the present invention

[0025] In the figure: 1 joystick,

[0026] 2 fixed frame, 21 fixing plate, 22 L-shaped plate,

[0027] 3 steering device, 31 mounting bracket, 32 rotating bracket, 321 mounting hole,

[0028] 4 connecting rod, 5 fish-eye rod, 6, rotating mechanism, 61 pin shaft, 62 split pin, 7 multi-way valve, 71 first-stage spool, 72 second-stage spool, 8 mounting plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0030] As Figures 1-5 shown, a centralized control device for a multi-way valve includes a multi-way valve 7 and a control lever 1. The control lever 1 is rotatably connected to a steering device 3 through a fixing bracket 2. The steering device 3 is respectively connected to two valve cores of the multi-way valve 7 through a connecting rod 4 and a ball eye rod 5, so that when the control lever 1 rotates around the axis, one of the valve cores is driven to work; the multi-way valve 7 and the steering device 3 are both fixedly installed on a mounting plate 8.

[0031] That is, a front-back rotation axis and a left-right rotation axis are formed between the fixing bracket 2 and the steering device 3. When the control lever 1 rotates around the axis, one of the valve cores is driven to work, while the other valve core does not work; when the control lever 1 moves to other angles, the two valve cores are jointly controlled to achieve a compound operation of the multi-way valve.

[0032] In a further solution, the steering device 3 includes a mounting bracket 31 fixedly installed on the mounting plate 8. A rotating bracket 32 is rotatably connected to the mounting bracket 31. The fixing bracket 2 is rotatably connected to the rotating bracket 32; the rotating bracket 32 rotates relative to the mounting bracket 31, and its connection part serves as the front-back rotation axis; the fixing bracket 2 rotates relative to the rotating bracket 32, and its connection part serves as the left-right rotation axis.

[0033] In a further preferred solution, the rotating bracket 32 is an S-shaped structure bent into three sections. The first section and the third section are both perpendicular to the second section. The first section and the second section are respectively rotatably connected to the mounting bracket 31 and the fixing bracket 2 through a rotating mechanism 6. The third section of the rotating bracket 32 is hinged to the connecting rod 4. The fixing bracket 2 includes an L-shaped plate 22 rotatably connected to the rotating bracket 32. The horizontal section of the L-shaped plate 22 is rotatably connected to the second section of the rotating bracket 32 through a rotating mechanism 6. The vertical section of the L-shaped plate 22 is arranged parallel to the first section of the rotating bracket 32 and is hinged to the ball eye rod 5; a fixing plate 21 for installing the control lever 1 is fixedly provided on the L-shaped plate 22.

[0034] Preferably, mounting holes 321 are provided on the three sections of the rotating bracket 32. The mounting holes 321 are used to install pin shafts to be respectively connected to the connecting rod, the fixing bracket, and the mounting bracket.

[0035] As Figure 3 described, the first section, the third section of the rotating bracket 32, and the vertical section of the L-shaped plate 22 are all parallel to the mounting bracket 31, while the second section of the rotating bracket 32 and the horizontal section of the L-shaped plate 22 are parallel and in contact with each other. Thus, two independent front-back rotation axis lines and left-right rotation axis lines are formed.

[0036] Further solution: the rotating mechanism 6 includes a pin shaft 61 and a split pin 62. That is, a gasket is added at the end of the pin shaft, and then the split pin is used for limiting. The split pin connection is for convenient installation, and the gasket is used to reduce the interference of the split pin on the movement.

[0037] Further solution: both ends of the connecting rod 4 are hinged to the steering device and the first spool valve 71 of the multi-way valve through pin shafts; both ends of the ball eye rod 5 are respectively hinged to the steering device and the second spool valve 72 of the multi-way valve.

[0038] The ball eye rod is a ball eye connecting rod, which is an existing product. One end is a connecting end with a connection hole, and the other end is a ball head end with spherical inner and outer rings. A bolt is embedded in the inner ring of the ball head end of the ball eye rod. After passing through the through hole on the L-shaped plate in the fixing bracket, it is fixed with a nut. Here, the ball head end of the ball eye rod is hinged with the steering device by a bolt and nut with clearance fit, which is to control the clearance between the ball eye rod and the surface of the L-shaped plate. The clearance is to ensure that the fixing bracket rotates and there is no interference between the ball eye rod and the L-shaped plate when the ball eye rod moves up and down. The connecting end of the ball eye rod is hinged to the second spool valve 72 through a pin shaft.

[0039] That is, the specific structure in this embodiment is:

[0040] The control lever 1 is welded to the fixing plate 21, and the fixing plate 21 is welded to the top of the L-shaped plate 22; circular through holes are opened in both the horizontal section and the vertical section of the L-shaped plate 22. The horizontal section is hinged to the rotating bracket 32 through a pin shaft 61, and the outer end of the rotating bracket 32 is connected through a gasket and a split pin 62. Then, the control lever 1, the fixing bracket 2 and the pin shaft 61 form a rotating pair and rotate around the axis of the left and right rotation shaft of the pin shaft 61. The surfaces of the fixing bracket 2 and the rotating bracket 32 are in contact to form a sliding pair. The vertical section of the L-shaped plate 22 is connected to the bolt protruding from the ball head end of the ball eye rod 5 and adopts clearance fit, ensuring a certain clearance between the L-shaped plate 22 and the ball eye rod 5, so that there is no interference between the control lever 1 and the ball eye rod 5 when the control lever 1 rotates left and right.

[0041] The mounting bracket 31 is welded to the mounting plate 8 for mounting the multi-way valve. Its outer end has a circular through hole and is hinged to the rotating bracket 32 through a pin shaft 61. The surfaces of the rotating bracket 32 and the mounting bracket 31 are in contact to form a rotating pair; the rotating bracket 32 is a three-section bent plate bent twice, and circular through holes are opened on all three sections, which are respectively hinged to the mounting bracket 31, the fixing bracket 2 and the connecting rod 4 to form three rotating pairs and three sliding pairs. The rotating bracket 32 rotates around the axis of the front and back rotation shaft at the center of the circular through hole on the mounting bracket 31.

[0042] One end of the connecting rod 4 is hinged to the first-stage spool valve 71 of the multi-way valve, and the other end is hinged to the rotating bracket 32, realizing the connection between the first-stage spool valve 71 and the control lever 1, and using the neutral position and stroke of the first-stage spool valve 71 to limit the initial position and rotation stroke of the rotating bracket 32.

[0043] The ball head end of the ball eye rod 5 is hinged to the steering device with a clearance fit to ensure there is a gap between the two to avoid interference during rotation. The other end is hinged to the second-stage spool valve 72 of the multi-way valve with a pin shaft, realizing the connection between the second-stage spool valve 72 and the control lever 1, and using the neutral position and stroke of the second-stage spool valve 72 to limit the initial position and rotation stroke of the control lever 1.

[0044] Therefore, in this application, the steering device composed of the mounting bracket and the rotating bracket forms a multi-link mechanism with the control lever, the connecting rod, and the ball eye rod. The mounting bracket serves as the fixed end, and due to the relative positional relationship among the mounting bracket, the rotating bracket, and the fixed bracket for fixedly installing the control lever, the rotating bracket 32 rotates relative to the mounting bracket 31, and its connection point serves as the front-back rotation axis A; the fixed bracket 2 rotates relative to the rotating bracket 32, and its connection point serves as the left-right rotation axis B (as Figure 5 shown).

[0045] When the control lever is pushed forward and backward, the rotating bracket rotates around the front-back rotation axis, driving the connecting rod to act. The connecting rod, the surface of the rotating bracket, and the spool valve mounting surface are coplanar, controlling the up and down movement of the first-stage spool valve to realize the forward and backward tilting operations of the forklift mast. At the same time, the rotation angle of the rotating bracket is limited by the stroke of this spool valve; since the center of the hinge hole of the ball eye rod and the fixed bracket is on the axis of the front-back rotation axis, the ball eye rod and the second-stage spool valve will not move when the rotating bracket rotates, realizing the separate control of the spool valve.

[0046] When the control lever is pushed left and right, the fixed bracket rotates around the left-right rotation axis, driving the ball eye rod to act. The ball head end of the ball eye rod is hinged to the steering device with a clearance fit, leaving a certain gap between them to avoid interference actions, controlling the up and down movement of the spool valve to realize the lifting and lowering operations of the forklift forks. Since the control lever is hinged to the rotating bracket through the fixed bracket, when the control lever rotates left and right, the rotating bracket will not rotate, that is, the connecting rod and the first-stage spool valve will not move, realizing the separate control of a single spool valve. Similarly, when the control lever is pushed at other angles, it is the combined control of the two spool valves to realize the compound operation of the multi-way valve.

[0047] Another embodiment of this application is to provide a forklift, and the forklift includes the centralized control device of the multi-way valve in the above embodiment.

[0048] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the spirit of the present invention's design, any modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A centralized control device for a multi-way valve, comprising a multi-way valve (7) and a joystick (1), characterized in that: The joystick (1) is rotatably connected to the steering device (3) through a fixing bracket (2). The steering device (3) is respectively connected to two valve cores of the multi-way valve (7) through a connecting rod (4) and a fish-eye rod (5), so that when the joystick (1) rotates around its axis, it drives one of the valve cores to work. The multi-way valve (7) and the steering device (3) are both fixedly installed on the mounting plate (8). The steering device (3) includes a mounting bracket (31) fixedly installed on the mounting plate (8). A rotating bracket (32) is rotatably connected to the mounting bracket (31). The rotating bracket (32) rotates relative to the mounting bracket (31) with its connection point as the front-back rotation axis. The fixing bracket (2) is rotatably connected to the rotating bracket (32). The fixing bracket (2) rotates relative to the rotating bracket (32) with its connection point as the left-right rotation axis. The two ends of the connecting rod (4) are respectively hinged to the steering device and the first-stage valve core (71) of the multi-way valve through a pin shaft. The two ends of the fish-eye rod (5) are respectively hinged to the steering device and the second valve core (72) of the multi-way valve.

2. The centralized control device for a multi-way valve according to claim 1, characterized in that: The rotating bracket (32) is an S-shaped structure bent into three sections. The first section and the third section are both perpendicular to the second section. The first section and the second section are respectively rotationally connected to the mounting bracket (31) and the fixing bracket (2) through a rotating mechanism (6). The third section of the rotating bracket (32) is hinged to the connecting rod (4).

3. The centralized control device of a multi-way valve according to claim 2, characterized in that: Mounting holes (321) are provided on the three sections of the rotating bracket (32).

4. The centralized control device of a multi-way valve according to claim 2, characterized in that: The fixing bracket (2) includes an L-shaped plate (22) rotatably connected to the rotating bracket (32). The horizontal section of the L-shaped plate (22) is rotationally connected to the second section of the rotating bracket (32) through a rotating mechanism (6). The vertical section of the L-shaped plate (22) is arranged parallel to the first section of the rotating bracket (32) and is hinged to the fish-eye rod (5). A fixing plate (21) for mounting the joystick (1) is fixedly provided on the L-shaped plate (22).

5. The centralized control device for a multi-way valve according to claim 2, characterized in that: The rotating mechanism (6) includes a pin shaft (61) and a split pin (62).

6. A forklift, characterized in that: The forklift includes a centralized control device for the multi-way valve according to any one of claims 1-5.

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