Multi-gear speed regulating mechanism of multi-way valve additional connection and forklift

Abstract

The multi-gear speed regulating mechanism comprises a valve rod and a contact switch of the multi-way valve, and further comprises a triggering piece arranged on the valve rod, the triggering piece comprises a first triggering part and a second triggering part which are arranged up and down, and the first triggering part and the second triggering part are arranged on the first triggering part and the second triggering part respectively. The first trigger part protrudes and extends upwards towards the inclined upward direction of a contact of the contact switch to form a first contact end, the second trigger part protrudes and extends upwards towards the inclined downward direction of the contact to form a second contact end, and the first contact end and the second contact end are arranged in a non-equidistant mode with the center line, perpendicular to the valve rod, of the contact. The first contact end and the second contact end respectively trigger the contacts to form different triggering amounts, so that the hydraulic motor is controlled to respectively form different rotating speeds, the hydraulic pump is ensured to respectively output different flows, forward and backward tilting actions of the tilting oil cylinder are respectively controlled through multi-gear speed regulation, and the forward and backward tilting flow requirements of the tilting oil cylinder are accurately matched.

Description

Technical Field

[0001] The utility model relates to the technical field of forklifts, in particular to a multi-speed regulating mechanism with a multi-way valve attached and a forklift. Background Art

[0002] At present, the speed control gear of the multi-way valve additional connection of the forklift generally has only one gear. The valve stem of the multi-way valve is provided with an annular groove with an isosceles trapezoidal cross-section, and the contact switch is arranged in the center of the annular groove. When the valve stem of the multi-way valve moves up or down, the upper and lower groove walls of the groove respectively trigger the contact switch to form the same displacement, so as to control the forklift's pump motor to form two identical speeds, which ultimately causes the hydraulic pump of the forklift's tilt cylinder to output the same flow rate twice. Therefore, the forward and backward tilting actions of the tilt cylinder can only be controlled by one gear. However, when the tilt cylinder tilts, due to the different flow requirements for the forward and backward tilting, it is impossible to accurately match the actual flow requirements, resulting in waste of excess energy and causing energy consumption and temperature rise deviations. Utility Model Content

[0003] Therefore, in order to solve the above problems, the present invention provides a multi-speed regulating mechanism and a forklift truck with a multi-way valve attached, which can achieve multi-speed regulation.

[0004] To achieve the above purpose, the technical solutions provided by the present invention are as follows:

[0005] The utility model provides a multi-speed speed regulation mechanism attached to a multi-way valve, comprising a valve stem of the multi-way valve and a contact switch corresponding one-to-one to the valve stem, and also comprising a trigger member arranged on the valve stem; the trigger member comprises a first trigger portion and a second trigger portion arranged upper and lower, and the first trigger portion protrudes and extends in an obliquely upward direction toward a contact of the contact switch to form a first contact end, and the second trigger portion protrudes and extends in an obliquely downward direction toward the contact to form a second contact end; the first contact end and the second contact end are respectively arranged at unequal distances from the center line of the contact perpendicular to the valve stem, so that the triggering amounts formed by the first contact end and the second contact end respectively triggering the contacts are different, thereby forming a multi-speed speed regulation setting.

[0006] Furthermore, the first trigger portion is a first inclined surface, the second trigger portion is a second inclined surface, and the inclined length of the first inclined surface is not equal to the inclined length of the second inclined surface.

[0007] Furthermore, the outward end of the first inclined surface is the first contact end, and the outward end of the second inclined surface is the second contact end.

[0008] Furthermore, the first inclined surface and the second inclined surface are spaced apart from each other, a transition surface is provided between the first inclined surface and the second inclined surface, and the transition surface is a plane.

[0009] Furthermore, the first trigger part is a first stage, the second trigger part is a second stage, the first stage and the second stage both have multiple steps, and the outermost steps of the first stage and the second stage close to the contact are the first contact end and the second contact end, respectively.

[0010] Furthermore, the outer peripheral wall of the valve stem has a groove corresponding to the contact, the upper groove wall and the lower groove wall of the groove are conical, and the valve stem sleeve is provided with an annular triggering portion; the annular triggering portion is located at the upper groove edge of the groove, the annular triggering portion and the lower groove wall of the groove jointly form the triggering part, and the annular triggering portion is the first triggering portion, and the lower groove wall of the groove is the second triggering portion; or the annular triggering portion is located at the lower groove edge of the groove, the annular triggering portion and the upper groove wall of the groove jointly form the triggering portion, and the upper groove wall of the groove is the first triggering portion, and the annular triggering portion is the second triggering portion.

[0011] Furthermore, one end of the annular trigger portion facing the groove is provided with a tapered surface for matching the groove wall of the groove.

[0012] Furthermore, it also includes a switch bracket, which is assembled on the multi-way valve, and the contact switch is assembled on the switch bracket.

[0013] Furthermore, the contact switch is used to trigger the controller to control the rotation speed of the hydraulic motor, thereby adjusting the output flow of the hydraulic pump.

[0014] The utility model provides a forklift, which at least comprises the above-mentioned multi-way valve additionally connected with a multi-speed regulating mechanism.

[0015] The technical solution provided by the utility model has the following beneficial effects:

[0016] The first trigger portion of the trigger member is extended in an oblique upward direction toward the contact of the contact switch to form a first contact end, and the second trigger portion of the trigger member is extended in an oblique downward direction toward the contact to form a second contact end, and the first contact end and the second contact end are respectively arranged at unequal distances from the center line of the contact perpendicular to the valve stem, so as to ensure that the triggering amounts formed by the first contact end and the second contact end respectively triggering the contacts are different, so as to control the hydraulic motor of the forklift to form different speeds, thereby ensuring that the hydraulic pump of the tilt cylinder of the forklift outputs different flow rates, so as to realize the forward and backward tilting actions of the tilt cylinder respectively controlled by multi-speed regulation, so as to accurately match the forward and backward tilting flow requirements of the tilt cylinder, thereby avoiding the waste of excess energy, not only reducing energy consumption but also preventing temperature rise deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure shows a schematic diagram of a multi-speed speed regulating mechanism with a multi-way valve attached in the first embodiment;

[0018] Figure 2 Shown Figure 1 Enlarged schematic diagram of area A in the middle;

[0019] Figure 3 The figure shows a schematic diagram of a multi-speed regulating mechanism with a multi-way valve attached in the second embodiment;

[0020] Figure 4 Shown Figure 3 Enlarged schematic diagram of area B in the middle. DETAILED DESCRIPTION

[0021] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0022] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0023] Example 1

[0024] Reference Figure 1 and Figure 2 As shown, embodiment 1 provides a multi-speed speed regulating mechanism (hereinafter referred to as the multi-speed speed regulating mechanism) with a multi-way valve attached, which is used to trigger the contact switch 2 and control the speed of the hydraulic motor of the forklift and the output flow of the hydraulic pump, thereby realizing the forward and backward tilting action of the tilt cylinder of the forklift.

[0025] The multi-speed control mechanism of this embodiment includes a valve stem 11 of a multi-way valve 1 and a contact switch 2 corresponding to the valve stem 11. The contact switch 2 is used to trigger a controller to control the speed of the hydraulic motor and thereby adjust the output flow of the hydraulic pump.

[0026] The multi-speed speed regulation mechanism of this embodiment also includes a switch bracket 5 and a trigger member 6 arranged on the valve stem 11. The trigger member 6 includes a first trigger part 3 and a second trigger part 4 arranged at an upper and lower intervals. The switch bracket 5 is assembled on the multi-way valve 1, and the contact switch 2 is assembled on the switch bracket 5. The first trigger part 3 protrudes and extends in an oblique upward direction toward the contact 21 of the contact switch 2 to form a first contact end 31, and the second trigger part 4 protrudes and extends in an oblique downward direction toward the contact 21 to form a second contact end 41. The first contact end 31 and the second contact end 41 are respectively arranged at unequal distances from the center line 7 of the contact 21 perpendicular to the valve stem 11, so that the triggering amounts formed by the first contact end 31 and the second contact end 41 triggering the contact 21 are different, thereby forming a multi-speed speed regulation setting.

[0027] In specific implementation, a groove 12 is provided on the side of the trigger member 6 facing the contact 21. The specific groove 12 is a trapezoidal groove, the upper waist of the trapezoidal groove is the first inclined surface, and the lower waist of the trapezoidal groove is the second inclined surface. The inclined length of the first inclined surface is greater than the inclined length of the second inclined surface. At this time, the first trigger part 3 is the first inclined surface, and the second trigger part 4 is the second inclined surface.

[0028] The outward end of the first trigger part 3 is the first contact end 31, and the outward end of the second trigger part 4 is the second contact end 41, and the protruding distance of the first contact end 31 relative to the center axis of the valve stem 11 is greater than the protruding distance of the second contact end 41 relative to the center axis of the valve stem 11.

[0029] In addition, the bottom of the trapezoidal groove is a transition surface between the first triggering portion 3 and the second triggering portion 4, and the transition surface is a plane.

[0030] When the valve stem 11 is at the initial position, the contact 21 is located at a position corresponding to the transition surface between the first triggering portion 3 and the second triggering portion 4 , and the three portions do not contact each other.

[0031] When the valve stem 11 moves upward, the valve stem 11 drives the first triggering part 3 and the second triggering part 4 of the trigger member 6 to rise synchronously, and the first triggering part 3 gradually moves away from the contact 21, while the second triggering part 4 gradually approaches the contact 21 until they abut against each other. In the rising process of the valve stem 11, since the second triggering part 4 protrudes and extends in an inclined downward direction, the contact 21 slides obliquely on the second triggering part 4 while moving forward. When it slides to the second contact end 41 of the second triggering part 4, the displacement of the contact 21 in the forward direction is also the largest. This displacement is the triggering amount formed by the second contact end 41 triggering the contact 21.

[0032] When the valve stem 11 moves downward, the valve stem 11 drives the first triggering part 3 and the second triggering part 4 of the trigger member 6 to descend synchronously, the second triggering part 4 gradually moves away from the contact 21, and the first triggering part 3 gradually approaches the contact 21 until they abut against each other. In the rising process of the valve stem 11, since the first triggering part 3 protrudes and extends in an inclined upward direction, the contact 21 slides obliquely on the first triggering part 3 while moving forward. When it slides to the first contact end 31 of the first triggering part 3, the displacement of the contact 21 in the forward direction is also the largest. This displacement is the triggering amount formed by the first contact end 31 triggering the contact 21.

[0033] In short, when the contact 21 slides to the first contact end 31 of the first trigger part 3 and the second contact end 41 of the second trigger part 4 respectively, the first contact end 31 and the second contact end 41 respectively trigger the contact 21 to form different triggering amounts, and the controller controls the hydraulic motor of the forklift to form different speeds respectively, thereby ensuring that the hydraulic pumps of the forklift's tilt cylinder output different flow rates respectively, so as to achieve multi-speed speed regulation.

[0034] By extending the first trigger portion 3 obliquely upward toward the contact 21 of the contact switch 2 to form a first contact end 31, and extending the second trigger portion 4 obliquely downward toward the contact 21 to form a second contact end 41, and the first contact end 31 and the second contact end 41 are respectively arranged at unequal distances from the center line 7 of the contact 21 perpendicular to the valve stem 11, it is ensured that the triggering amounts formed by the first contact end 31 and the second contact end 41 respectively triggering the contact 21 are different, and the controller controls the hydraulic motor of the forklift to form different speeds, thereby ensuring that the hydraulic pumps of the tilt cylinder of the forklift output different flow rates, so as to realize the forward and backward tilting actions of the tilt cylinder respectively controlled by multi-speed regulation, so as to accurately match the forward and backward tilting flow requirements of the tilt cylinder, thereby avoiding the waste of excess energy, not only reducing energy consumption but also preventing temperature rise deviation.

[0035] In addition, the trigger member 6 of this embodiment has a simple structure, low cost and is easy to install, and there is no need to process the complex first trigger part 3 and second trigger part 4 on the valve stem 11 itself, so as to ensure that the valve stem 11 has a simple structure and low cost.

[0036] Of course, in other embodiments, the oblique length of the first trigger portion 3 may also be smaller than the oblique length of the second trigger portion 4, and multi-speed regulation may also be achieved.

[0037] In addition, the first trigger part 3 can also be the first stage, and the second trigger part 4 can be the second stage. The first stage and the second stage both have multiple steps, and the outermost steps of the first stage and the second stage close to the contact 21 are the first contact end 31 and the second contact end 41 respectively, so that multi-speed regulation can also be achieved.

[0038] Example 2

[0039] like Figure 3 and Figure 4 As shown, embodiment 2 provides a multi-speed regulating mechanism with an additional connection to a multi-way valve. The structures of embodiment 2 and embodiment 1 are substantially the same, except that an annular trigger portion is sleeved on the valve stem 11 of the multi-way valve 1 of the prior art, and the valve stem 11 has a groove 12' belonging to the prior art and having an isosceles trapezoidal cross-section, that is, the upper groove wall and the lower groove wall of the groove 12' are conical, and the upper groove wall and the lower groove wall of the groove 12' are axially symmetrically arranged, the annular trigger portion is located at the lower groove edge of the groove 12', and the annular trigger portion and the lower groove wall of the groove 12' together form a trigger member. At this time, the upper groove wall of the groove 12' is the first trigger portion 3', and the annular trigger portion is the second trigger portion 4'.

[0040] The second trigger portion 4' is provided with a tapered surface 411 on the upper end facing the groove 12' for matching the lower groove wall of the groove 12' to ensure that the contact 21 of the contact switch 2 can slide from the lower groove wall of the groove 12' to the tapered surface 411 of the second trigger portion 4'.

[0041] The upper end of the upper groove wall of the groove 12' is the first contact end 31', and the lower end of the tapered surface 411 of the second triggering portion 4' is the second contact end 41'. Since the tapered surface 411 of the second triggering portion 4' is superimposed on the outer peripheral wall of the valve stem 11, the protruding distance of the first contact end 31' relative to the central axis of the valve stem 11 is smaller than the protruding distance of the second contact end 41' relative to the central axis of the valve stem 11. In this way, it can be ensured that the triggering amount formed by the first contact end 31' triggering the contact 21 is smaller than the triggering amount formed by the second contact end 41' triggering the contact 21, thereby realizing multi-speed regulation.

[0042] Of course, in other embodiments, the second trigger portion 4' may also be located at the upper groove edge of the groove 12', in which case the annular trigger portion is the first trigger portion 3', and the lower groove wall of the groove 12' is the second trigger portion 4'.

[0043] Furthermore, the upper and lower groove walls of the groove 12 ′ may not be arranged axially symmetrically, as long as the protrusion distances of the first contact end 31 ′ and the second contact end 41 ′ relative to the central axis of the valve stem 11 are different.

[0044] Example 3

[0045] The third embodiment provides a forklift, which includes at least the multi-way valve of the first embodiment or the second embodiment and an additional multi-speed speed regulating mechanism.

[0046] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.

Claims

1. A multi-speed speed regulating mechanism with a multi-way valve attached, comprising a valve stem of the multi-way valve and a contact switch corresponding to the valve stem, characterized in that: It also includes a trigger member arranged on the valve stem; the trigger member includes a first trigger part and a second trigger part arranged in an upper and lower manner, and the first trigger part protrudes and extends in an oblique upward direction toward the contact of the contact switch to form a first contact end, and the second trigger part protrudes and extends in an oblique downward direction toward the contact to form a second contact end; the first contact end and the second contact end are respectively arranged at unequal distances from the center line of the contact perpendicular to the valve stem, so that the triggering amounts formed by the first contact end and the second contact end respectively triggering the contacts are different, thereby forming a multi-speed regulation setting.

2. The multi-speed regulating mechanism with a multi-way valve attachment according to claim 1, characterized in that: The first trigger portion is a first inclined surface, the second trigger portion is a second inclined surface, and the inclined length of the first inclined surface is not equal to the inclined length of the second inclined surface.

3. The multi-speed regulating mechanism with a multi-way valve attachment according to claim 2, characterized in that: The outward end of the first inclined surface is the first contact end, and the outward end of the second inclined surface is the second contact end.

4. The multi-speed speed regulating mechanism with a multi-way valve attachment according to claim 3, characterized in that: The first inclined surface and the second inclined surface are spaced apart from each other, a transition surface is provided between the first inclined surface and the second inclined surface, and the transition surface is a plane.

5. The multi-speed speed regulating mechanism with a multi-way valve attachment according to claim 1, characterized in that: The first trigger portion is a first stage, the second trigger portion is a second stage, the first stage and the second stage both have multiple steps, and the outermost steps of the first stage and the second stage close to the contact are the first contact end and the second contact end, respectively.

6. The multi-speed speed regulating mechanism with a multi-way valve attachment according to claim 1, characterized in that: The outer peripheral wall of the valve stem has a groove corresponding to the contact, the upper groove wall and the lower groove wall of the groove are tapered, and the valve stem sleeve is provided with an annular triggering portion; the annular triggering portion is located at the upper groove edge of the groove, the annular triggering portion and the lower groove wall of the groove jointly form the triggering member, and the annular triggering portion is the first triggering portion, and the lower groove wall of the groove is the second triggering portion; or the annular triggering portion is located at the lower groove edge of the groove, the annular triggering portion and the upper groove wall of the groove jointly form the triggering member, and the upper groove wall of the groove is the first triggering portion, and the annular triggering portion is the second triggering portion.

7. The multi-speed speed regulating mechanism with a multi-way valve attachment according to claim 6, characterized in that: One end of the annular triggering portion facing the groove is provided with a tapered surface for matching the groove wall of the groove.

8. The multi-speed regulating mechanism with a multi-way valve attached according to any one of claims 1 to 7, characterized in that: It also includes a switch bracket, which is assembled on the multi-way valve, and the contact switch is assembled on the switch bracket.

9. The multi-speed speed regulating mechanism with a multi-way valve attachment according to any one of claims 1 to 7, characterized in that: The contact switch is used to trigger the controller to control the rotation speed of the hydraulic motor and thus adjust the output flow of the hydraulic pump.

10. A forklift, characterized in that: At least includes a multi-speed speed regulating mechanism coupled with a multi-way valve as described in any one of claims 1-9.

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