Labor-saving scissor lift

Abstract

The utility model relates to the technical field of conveying equipment, and provides a labor-saving scissor lift which comprises a seat body, and an object supporting table is arranged above the seat body. The fixed fork arm and the movable fork arm are obliquely arranged in a crossed manner; the lower end of the fixed fork arm is connected to the seat body to form a fixed fulcrum; a rail is arranged on the rail base; the jacking assembly comprises a horizontally arranged wheel shaft, and the wheel shaft is sleeved with a jacking rolling wheel and a rail wheel; the jacking rolling wheel abuts against the fixed fork arm, and the rail wheel abuts against the rail; the driving assembly is connected with a wheel shaft of the jacking assembly; the driving assembly is configured to apply pulling force to the wheel shaft, so that the rail wheel moves along the rail, and then the jacking rolling wheel pushes the fixed fork arm to wind the fixed fulcrum, so that the object supporting table is lifted. Therefore, the track wheel is supported by the track, so that the jacking roller pushes the fixed fork arm to realize the lifting action. The lifting device is of a labor-saving structure, large-load lifting can be achieved with small driving force, and equipment cost and energy consumption are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of conveying equipment, and in particular relates to a labor-saving scissor lift. Background Art

[0002] Scissor lifts are common, such as the structure disclosed in Chinese patent CN118125354A, which usually uses a hydraulic cylinder to raise and lower the scissors. Due to the use of a forceful lever structure, the hydraulic cylinder needs to output a thrust several times the rated load to achieve lifting. Large-sized hydraulic cylinders need to be selected, which increases the manufacturing cost and kinetic energy consumption of the equipment.

[0003] Chinese patent CN218708873U improves the scissor lift equipment by driving the roller to lift and lower by an electric cylinder, which reduces the output thrust to a certain extent. However, the roller contacts the two fork arms at the same time, and is subject to reaction forces in two directions during the pushing process, which increases the output thrust and weakens the labor-saving effect.

[0004] In summary, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] In view of the above-mentioned defects, the utility model mainly provides a labor-saving scissor lift to solve the technical problem that the output thrust increases due to the large resistance during the lifting and pushing process.

[0006] In order to solve the above problems, the utility model provides a labor-saving scissor lift, comprising:

[0007] A seat body, with a supporting platform on the top;

[0008] The fixed fork arm and the movable fork arm are arranged obliquely and crosswise, and the middle parts of the two are rotatably connected; the lower end of the fixed fork arm is rotatably connected to the base body, and a fixed fulcrum is formed at the position of the rotatable connection; the upper end of the movable fork arm is rotatably connected to the support platform; the upper end of the fixed fork arm and the lower end of the movable fork arm form a sliding or rolling fit with the support platform and the base body respectively;

[0009] A rail seat is arranged below the support platform; a rail is arranged on the rail seat;

[0010] The lifting assembly forms rolling contact with the track and the fixed fork arm respectively; the lifting assembly comprises a horizontally arranged wheel shaft, on which a lifting roller and a track wheel are rotatably sleeved; the lifting roller abuts against the fixed fork arm, and the track wheel abuts against the track;

[0011] A driving assembly is connected to the wheel axle of the lifting assembly; the driving assembly is configured to: apply tension to the wheel axle to move the track wheel along the track, thereby causing the lifting roller to push the fixed fork arm to rotate around the fixed fulcrum to lift the support platform.

[0012] According to the labor-saving scissor lift of the utility model, the top position of the track has a horizontal section.

[0013] According to the labor-saving scissor lift of the utility model, the track is an arc-shaped structure.

[0014] According to the labor-saving scissor lift of the utility model, the track is an inclined straight structure.

[0015] According to the labor-saving scissor lift of the utility model, the track structure includes an inclined straight section and an arc section which are connected to each other.

[0016] According to the labor-saving scissor lift of the utility model, an energy storage spring is provided on the seat body; the energy storage spring is configured to: compress and store energy during the descent of the supporting platform; when the supporting platform is lifted, the energy storage spring releases elastic energy to provide vertical lifting force and reduce the load of the drive cylinder.

[0017] According to the labor-saving scissor lift of the utility model, there are four energy storage springs, which are respectively arranged at the four vertices of the seat body.

[0018] According to the labor-saving scissor lift of the utility model, the driving assembly is a driving cylinder; the cylinder body of the driving cylinder is hingedly connected to the seat body, and the telescopic rod is hingedly connected to the wheel axle.

[0019] According to the labor-saving scissor lift of the utility model, the driving cylinder is an electric cylinder, a hydraulic cylinder or a pneumatic cylinder.

[0020] According to the labor-saving scissor lift of the utility model, the driving assembly includes a winch, and a pull rope or a pull belt is wound around the winch, and the pull rope or the pull belt is also connected to the wheel axle.

[0021] According to the labor-saving scissor lift of the utility model, there are two tracks; correspondingly, there are two lifting rollers and two track wheels sleeved on the wheel axle.

[0022] According to the labor-saving scissor lift of the utility model, the rail seat is fixed on the seat body.

[0023] In summary, the utility model sets a rail seat and uses the rail to support the rail wheel, so that the lifting roller pushes the fixed fork arm to achieve the lifting action. The utility model is a labor-saving structure and can use a smaller lifting thrust F 顶, to achieve the lifting of larger loads. The pulling force provided by the drive cylinder only needs to generate a force component greater than F on the fixed fork arm. 顶 , the lifting action can be realized. Compared with the prior art, under the same rated lifting load, the utility model significantly reduces the specifications of the driving cylinder, reduces the manufacturing cost of the equipment and the energy consumption of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the jacking assembly of the utility model;

[0026] Figure 3 It is a schematic diagram of the lifting working principle of the utility model;

[0027] Figure 4 It is a schematic diagram of force analysis of the wheel axle of the utility model;

[0028] Figure 5 It is a structural schematic diagram of an embodiment of the track of the utility model;

[0029] Figure 6 It is a structural schematic diagram of an embodiment of the track of the utility model;

[0030] Figure 7 It is a structural schematic diagram of an embodiment of the track of the utility model;

[0031] Figure 8 It is a structural schematic diagram of an embodiment of the track of the utility model;

[0032] Fig. 9 It is a structural schematic diagram of an embodiment of the utility model;

[0033] In the figure: 1-base, 11-supporting platform, 12-energy storage spring, 13-fixed fulcrum, 14-support foot; 2-fixed fork arm, 21-center of gravity; 3-movable fork arm, 4-driving cylinder, 41-lifting roller, 42-track wheel, 43-axle; 5-rail seat, 51-track, 52-horizontal section; 6-winch, 61-pull rope. DETAILED DESCRIPTION

[0034] See also Figure 1 The utility model provides a labor-saving scissor lift, comprising:

[0035] The seat body 1 has a support table 11 on the top;

[0036] The fixed fork arm 2 and the movable fork arm 3 are arranged obliquely and crosswise, and the middle part of the two forms a rotation connection; the position where the two are rotated together forms a center of gravity 21;

[0037] The lower end of the fixed fork arm 2 is rotatably connected to the seat body 1; the position of the rotatable connection forms a fixed fulcrum 13;

[0038] The upper end of the movable fork arm 3 is rotatably connected to the support platform 11;

[0039] The upper end of the fixed fork arm 2 and the lower end of the movable fork arm 3 form a sliding or rolling fit with the support platform 11 and the base body 1 respectively;

[0040] The sliding or rolling matching method can be implemented by using a structure known in the art, such as the matching of a rolling wheel and a wheel groove; or a linear slide rail structure, etc.

[0041] Combination Figure 2 , further comprising a rail seat 5, arranged below the support platform 11; a rail 51 is arranged on the rail seat 5;

[0042] The lifting assembly forms rolling contact with the track 51 and the fixed fork arm 2 respectively; the lifting assembly comprises a horizontally arranged wheel shaft 43, on which a lifting roller 41 and a track wheel 42 are rotatably sleeved; the lifting roller 41 abuts against the fixed fork arm 2, and the track wheel 42 abuts against the track 51;

[0043] A driving assembly connected to the axle 43 of the lifting assembly; the driving assembly is configured to: apply a pulling force to the axle 43 to move the track wheel 42 along the track 51, thereby causing the lifting roller 41 to push the fixed fork arm 2 to rotate around the fixed fulcrum 13 to lift the support platform 11;

[0044] When the support platform 11 descends, the track wheel 42 is pushed to move in the opposite direction along the track 51 under the action of gravity, and the driving cylinder 4 applies a pulling force to the wheel shaft 43 to control the descending speed of the support platform 11 .

[0045] As an embodiment, the driving assembly of the utility model is a driving cylinder 4; the cylinder body of the driving cylinder 4 is rotatably connected to the base body 1, and can also be rotatably connected and fixed to a support on the ground. The telescopic rod of the driving cylinder 4 is rotatably connected to the wheel axle 43. Those skilled in the art can make adaptive selections according to actual usage scenarios.

[0046] Optionally, the rotation connection method of the present invention can be a hinge or other well-known structures.

[0047] Preferably, the drive cylinder 4 of the utility model is an electric cylinder; in the scenario where the lifting load is large, the drive cylinder 4 can also be a hydraulic cylinder. Optionally, in the scenario where the load is small, the drive cylinder 4 can also be a pneumatic cylinder.

[0048] See also Fig. 9As an embodiment, the driving assembly of the utility model includes a winch 6, on which a pull rope 61 is wound, and the pull rope 61 is also connected to the wheel axle 43; the winch 6 winds the pull rope 61 to generate tension on the wheel axle 43.

[0049] Optionally, the drawstring 61 of the present invention may also be replaced by a drawstring.

[0050] For the sake of clarity, the working principle of the present invention is described by taking the driving assembly as an embodiment of the driving cylinder 4. The effects of other embodiments of the driving assembly are the same as those of the driving cylinder 4 and will not be described in detail.

[0051] Combination Figure 3 , the weight of the object carried by the support platform 11 acts on the center of the support platform 11, and its load is recorded as: G 物 , fixed pivot 13 and G 物 The length of the lever arm is recorded as: L 物 ;

[0052] The lifting thrust exerted by the lifting roller 41 on the fixed fork arm 2 is recorded as: F 顶 The arm length of the force from the fixed support point 13 is recorded as: L 顶 According to the common knowledge in this field, it can be known that the conditions for achieving jacking are: F 顶 *L 顶 ≥G 物 *L 物 ;

[0053] On the fixed fork arm 2, the distance between the fixed support point 13 and the center of gravity 21 is recorded as: L a ; Combining the geometric relationship in the figure, we can know that L 物 Always less than L a .

[0054] Combination Figure 3 Due to the travel limit of the track 51, during the lifting process of the support platform 11, the fixed support point 13 and the contact point between the lifting roller 41 and the fixed fork arm 2 are always located on both sides of the center of gravity 21. 顶 Always greater than L a .

[0055] Then we can know that L 顶 Always greater than L 物 .

[0056] Unlike the prior art with a small force arm, the utility model has a large force arm and is a labor-saving structure. 顶 , to achieve the lifting of larger loads. The pulling force provided by the drive cylinder 4 generates a force component on the fixed fork arm 2 that only needs to meet the required F 顶Compared with the prior art, under the same rated lifting load, the utility model significantly reduces the specification of the drive cylinder 4, reduces the manufacturing cost of the equipment and the energy consumption of operation.

[0057] The utility model sets a rail seat 5 and uses the rail 51 to support the rail wheel 42, so that the lifting roller 41 pushes the fixed fork arm 2 to achieve the lifting action. The utility model is a labor-saving structure, and a small lifting thrust F 顶 , to achieve the lifting of a larger load. The pulling force provided by the drive cylinder 4 generates a force component on the fixed fork arm 2 that only needs to meet the required F 顶 Compared with the prior art, under the same rated lifting load, the utility model significantly reduces the specification of the drive cylinder 4, reduces the manufacturing cost of the equipment and the energy consumption of operation.

[0058] In the initial state of the lifting action, the height of the support platform 11 is the lowest. 顶 maximum,

[0059] See also Figure 4 , the force exerted by the drive cylinder 4 on the wheel shaft 43 is recorded as: F 驱 ;

[0060] The lifting thrust exerted by the wheel shaft 43 on the fixed fork arm 2 through the lifting roller 41 is recorded as: F 顶 ;

[0061] The reaction force exerted by the fixed fork arm 2 on the wheel axle 43 is recorded as: F 压 ; It is easy to know F 压 =F 顶 ;

[0062] The reaction force of the track 51 on the track wheel 42 is recorded as: F 反 ;

[0063] It can be learned that: F 驱 With F 反 The combined force forms F 顶 ; and at any time, F 驱 、F 反 and F 压 The three must be balanced.

[0064] At any time during the lifting process, F 顶 The value of F 驱 With F 反 The angle between the two determines the F 驱 The value of also determines the output load of the drive component.

[0065] According to the parallelogram law, those skilled in the art can know that: 驱 With F反 The angle between F and 驱 The size of the drive component can meet the F 顶 need.

[0066] Affected by the shape of track 51, during the entire lifting process, F 驱 With F 反 The angle between the two will change, so that F 驱 There will be a maximum value and a minimum value. Therefore, the pulling force provided by the driving cylinder 4 can smoothly complete the lifting action as long as it can produce the required lifting thrust.

[0067] As a preferred solution, the utility model can optimize the shape of the track 51 to make F 驱 The inventors conducted a large number of experiments to test the F 驱 The relationship between the lifting load of the equipment and the lifting load of the equipment. 驱 The maximum value may not exceed 1.5 times of the jacking load, or even be less than the jacking load. Compared with the prior art, the specification of the driving cylinder 4 is greatly reduced.

[0068] The utility model provides various embodiments of the track 51 shape structure for different purposes:

[0069] See also Figure 5 As an embodiment of the track 51 structure, the track 51 is an arc-shaped structure; F 驱 With F 反 The angle is smaller, and the F 驱 Value, even F 驱 <F 顶 .

[0070] Moreover, during the lifting process of the arc, F 驱 With F 反 The angle of F 驱 The fluctuation range is small. Under the premise of certain load, a smaller drive cylinder 4 can be adapted to reduce equipment cost and energy consumption.

[0071] See also Figure 6 As an embodiment of the track 51 structure, the track 51 has a horizontal section 52 at the top; in this section, F 反 The direction is vertical, F 驱 With F 反 The angle between F 驱 <F 顶 , reducing the required output load of the drive cylinder 4. At the same time, it is beneficial for the drive cylinder 4 to maintain the jacking posture, making it convenient for the lift to carry out the transportation operation of loading and unloading goods in this state.

[0072] See also Figure 7 As an embodiment of the track 51 structure, the track 51 is an inclined straight structure; when the horizontal stroke of the track wheel 42 is the same, the vertical stroke can be increased. It is suitable for situations where the lifting range is large.

[0073] See also Figure 8 As an embodiment of the track 51 structure, the track 51 structure includes an inclined straight section and an arc section connected to each other; in the initial stage of lifting, a large lifting thrust needs to be provided. At this time, the track 51 is an arc structure, which reduces the F of the drive cylinder 4. 驱 ; Afterwards, the vertical lifting distance can be increased on the inclined straight structure, taking into account the vertical stroke.

[0074] Preferably, based on the consideration of force balance, the number of the rails 51 is two; correspondingly, the number of the lifting rollers 41 and the number of the rail wheels 42 sleeved on the wheel axle 43 are both two.

[0075] See also Figure 1 As a preferred solution, the seat body 1 is provided with an energy storage spring 12; during the descending process of the support platform 11, the energy storage spring 12 is compressed and stores energy. When the support platform 11 is lifted, the energy storage spring 12 releases elastic energy to provide a vertical lifting force to reduce F 顶 The initial value of reduces the load on the drive cylinder 4.

[0076] Preferably, there are four energy storage springs 12 , which are respectively arranged at the four vertices of the seat body 1 .

[0077] Optionally, four supporting feet 14 are provided at the bottom of the base body 1 ; the height of the supporting feet 14 is adjustable, so as to facilitate adjusting the levelness of the supporting platform 11 .

[0078] Optionally, the rail seat 5 is fixed on the seat body 1 to facilitate the overall transportation of the equipment.

[0079] In summary, the utility model provides a labor-saving scissor lift, which provides a rail seat, uses the rail to support the rail wheel, and enables the lifting roller to push the fixed fork arm to achieve the lifting action. The utility model is a labor-saving structure, and can use a smaller lifting thrust F 顶 , to achieve the lifting of larger loads. The pulling force provided by the drive cylinder only needs to generate a force component greater than F on the fixed fork arm. 顶 , the lifting action can be realized. Compared with the prior art, under the same rated lifting load, the utility model significantly reduces the specifications of the driving cylinder, reduces the manufacturing cost of the equipment and the energy consumption of operation.

[0080] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A labor-saving scissor lift, characterized in that: include: A seat body, with a support platform on the top; The fixed fork arm and the movable fork arm are arranged obliquely and crosswise, and the middle parts of the two are rotatably connected; the lower end of the fixed fork arm is rotatably connected to the base body, and a fixed fulcrum is formed at the position of the rotatable connection; the upper end of the movable fork arm is rotatably connected to the support platform; the upper end of the fixed fork arm and the lower end of the movable fork arm form a sliding or rolling fit with the support platform and the base body respectively; A rail seat is arranged below the support platform; a rail is arranged on the rail seat; The lifting assembly forms rolling contact with the track and the fixed fork arm respectively; the lifting assembly comprises a horizontally arranged wheel shaft, on which a lifting roller and a track wheel are rotatably sleeved; the lifting roller abuts against the fixed fork arm, and the track wheel abuts against the track; A driving assembly is connected to the wheel axle of the lifting assembly; the driving assembly is configured to: apply tension to the wheel axle to move the track wheel along the track, thereby causing the lifting roller to push the fixed fork arm to rotate around the fixed fulcrum to lift the support platform.

2. The labor-saving scissor lift according to claim 1, characterized in that: The track has a horizontal section at its top position.

3. The labor-saving scissor lift according to claim 1, characterized in that: The track is an arc-shaped structure.

4. The labor-saving scissor lift according to claim 1, characterized in that: The track is an inclined straight structure.

5. The labor-saving scissor lift according to claim 1, characterized in that: The track structure comprises an inclined straight section and an arc section which are connected to each other.

6. The labor-saving scissor lift according to any one of claims 1 to 5, characterized in that: An energy storage spring is provided on the seat body; the energy storage spring is configured to compress and store energy during the descending process of the supporting platform; when the supporting platform is lifted, the energy storage spring releases elastic energy to provide vertical lifting force and reduce the load of the driving cylinder.

7. The labor-saving scissor lift according to claim 6, characterized in that: There are four energy storage springs, which are respectively arranged at the four vertices of the seat body.

8. The labor-saving scissor lift according to claim 6, characterized in that: The driving assembly is a driving cylinder; the cylinder body of the driving cylinder is hingedly connected to the seat body, and the telescopic rod is hingedly connected to the wheel axle.

9. The labor-saving scissor lift according to claim 8, characterized in that: The driving cylinder is an electric cylinder, a hydraulic cylinder or a pneumatic cylinder.

10. The labor-saving scissor lift according to claim 6, characterized in that: The driving assembly comprises a winch, a pull rope or a pull belt is wound around the winch, and the pull rope or the pull belt is also connected to the wheel axle.

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