Wheel starting resistance coefficient measuring device

Abstract

The invention discloses a wheel starting resistance coefficient measuring device which comprises a bottom plate, a bearing plate, a first support, a second support, an inclined assembly, a wheel carrier and a weight. One end of the bottom plate is hinged to one end of the bearing plate, the first support is arranged at the other end of the bottom plate, the second support is arranged at the other end of the bearing plate, one end of the inclined assembly is installed in the first support, the other end of the inclined assembly is installed in the second support, the inclined assembly is used for achieving inclination of the bearing plate, and the wheel carrier is used for installing a wheel to be tested and a weight. According to the measuring device, the starting resistance coefficient of the polyurethane wheel can be rapidly measured, a traction device and a force measuring device are not needed, the measuring operation is simple and convenient, and the result is accurate.

Description

Technical Field

[0001] The invention relates to the technical field of wheel starting resistance coefficient measurement, and in particular to a wheel starting resistance coefficient measurement device. Background Art

[0002] The polyurethane wheel installed on the equipment or vehicle as a driving wheel is usually driven by an electric motor through a reduction mechanism. When starting the equipment or vehicle, the torque output by the motor driving the polyurethane wheel through the reduction gear must be greater than the resistance torque when the polyurethane wheel starts to rotate. The resistance torque is related to the load applied to the polyurethane wheel and the size and material of the polyurethane wheel. In engineering, the starting resistance coefficient is usually used to describe the starting resistance of the polyurethane wheel. The starting resistance coefficient is defined as the force that drives the polyurethane wheel to rotate divided by the load applied to the polyurethane wheel. Therefore, when designing a vehicle or equipment using a polyurethane wheel, it is necessary to measure the starting resistance coefficient of the relevant polyurethane wheel.

[0003] The currently disclosed devices for measuring the starting resistance coefficient usually use a traction device to pull the roller to rotate, and calculate the starting resistance coefficient based on the traction force measured by the force measuring device and the load borne by the roller. In this measurement method, the error of the force measuring device will affect the calculated starting resistance coefficient.

[0004] Therefore, it is urgent to design a better starting resistance coefficient measuring device. Summary of the invention

[0005] In view of the above problems existing in the prior art, a device for measuring the starting resistance coefficient of a wheel is provided.

[0006] The specific technical solutions are as follows:

[0007] A wheel starting resistance coefficient measuring device mainly comprises: a bottom plate, a support plate, a first support, a second support, a tilting assembly, a wheel frame and a weight;

[0008] One end of the base plate is hinged to one end of the support plate, the first support is arranged at the other end of the base plate, the second support is arranged at the other end of the support plate, one end of the tilting component is installed in the first support, and the other end of the tilting component is installed in the second support. The tilting component is used to realize the tilting of the support plate, and the wheel frame is used to install the wheel to be measured and the weight.

[0009] The above-mentioned wheel starting resistance coefficient measuring device also has the following characteristics: the tilting assembly includes a screw, a first rotating shaft and a second rotating shaft, one end of the screw extends into the first support, and the other end of the screw extends into the second support, the threads at both ends of the screw have opposite rotation directions, the first rotating shaft can be rotatably mounted on the first support, the second rotating shaft can be rotatably mounted on the second support, the first rotating shaft is threadedly matched with one end of the screw, and the second rotating shaft is threadedly matched with the other end of the screw.

[0010] The above-mentioned wheel starting resistance coefficient measuring device also has the following feature: the axis of the first rotating shaft intersects with the axis of the first support, and the axis of the second rotating shaft intersects with the axis of the second support.

[0011] The above-mentioned wheel starting resistance coefficient measuring device also has the feature that a hand wheel is sleeved on the screw.

[0012] The above-mentioned wheel starting resistance coefficient measuring device also has the following characteristics: a first bracket is provided at one end of the base plate, a second bracket is provided at one end of the support plate, and the first bracket and the second bracket are hingedly connected via a hinge shaft.

[0013] The above-mentioned wheel starting resistance coefficient measuring device also has the feature that a baffle is provided at each end of the supporting plate.

[0014] The above-mentioned wheel starting resistance coefficient measuring device also has such a feature that the wheel frame is a U-shaped member, one side of the wheel frame has a receiving groove for receiving the wheel to be measured, and the other side of the wheel frame can be used to place the weight;

[0015] Rolling members are arranged around one side of the wheel frame, and the rolling members can be rollingly matched with two side edges of the support plate that are away from each other.

[0016] The above-mentioned wheel starting resistance coefficient measuring device also has the feature that the rolling element is a bearing, a pulley or a roller.

[0017] The above-mentioned wheel starting resistance coefficient measuring device also has the following feature: fastening holes are provided on two opposite sides of the wheel frame, and fasteners are passed through the fastening holes and the wheel to be measured to be used for mounting the wheel to be measured on the wheel frame.

[0018] The above-mentioned wheel starting resistance coefficient measuring device also has a feature that a boss is provided on the other side of the wheel frame, and the boss is used to cover the weight.

[0019] The positive effects of the above technical solution are:

[0020] The present invention provides a wheel starting resistance coefficient measuring device, which places a wheel frame with weights and polyurethane wheels on a supporting plate, and tilts the supporting plate by operating a tilting component. When the wheel frame tilts to the point where it starts to slide, the starting resistance coefficient of each polyurethane wheel is measured and calculated. The starting resistance coefficient of the polyurethane wheel can be quickly measured without the need for a traction device and a force measuring device, and the measuring operation is simple and convenient, and the result is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the overall structure of a wheel starting resistance coefficient measuring device provided by the present invention in a first state;

[0022] Figure 2 A schematic diagram of the cross-sectional structure of a wheel starting resistance coefficient measuring device provided by the present invention along a first direction;

[0023] Figure 3 A schematic cross-sectional structure diagram of a wheel starting resistance coefficient measuring device provided by the present invention in a second state;

[0024] Figure 4 A schematic diagram of the cross-sectional structure of a wheel starting resistance coefficient measuring device provided by the present invention along a second direction;

[0025] Figure 5 This is a schematic diagram of measurement calculation.

[0026] In the accompanying drawings: 1, base plate; 2, supporting plate; 3, first support; 4, second support; 5, wheel frame; 52, boss; 6, weight; 7, screw; 8, first rotating shaft; 9, second rotating shaft; 10, hand wheel; 11, first bracket; 12, second bracket; 13, hinge shaft; 14, baffle; 15, bearing; 16, bolt; 17, first bushing; 18, second bushing; 19, third bushing; 20, gasket; 21, screw nut. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] See also Figures 1 to 5 The present invention discloses a wheel starting resistance coefficient measuring device, which is used to measure the starting resistance coefficient of a wheel, such as a polyurethane wheel 100. The wheel to be measured includes the polyurethane wheel 100 but is not limited to the polyurethane wheel 100, and can also be other various wheels. The wheel starting resistance coefficient measuring device includes: a bottom plate 1, a support plate 2, a first support 3, a second support 4, a tilting assembly, a wheel frame 5 and a weight 6;

[0031] One end of the base plate 1 is hinged to one end of the supporting plate 2, the first support 3 is arranged at the other end of the base plate 1, the second support 4 is arranged at the other end of the supporting plate 2, one end of the tilting component is installed in the first support 3, and the other end of the tilting component is installed in the second support 4. The tilting component is used to realize the tilting of the supporting plate 2, and the wheel frame 5 is used to install the wheel to be measured and the weight 6.

[0032] Optionally, the first support 3 is connected to the upper surface of the base plate 1 by means of screws, bolts 16 and the like, and the second support 4 is connected to the lower surface of the support plate 2 by means of screws, bolts 16 and the like. The first support 3 is fixed to the base plate 1, and the two will not move relative to each other, and the second support 4 is fixed to the support plate 2, and the two will not move relative to each other. The first support 3 and the base plate 1 are combined as a whole, and the second support 4 and the support plate 2 are combined as a whole, and are movable. Optionally, in this embodiment, the first support 3 and the second support 4 are sleeve structures.

[0033] Optionally, in this embodiment, the tilting assembly includes a screw 7, a first rotating shaft 8 and a second rotating shaft 9, one end of the screw 7 extends into the first support 3, and the other end of the screw 7 extends into the second support 4, the threads at both ends of the screw 7 have opposite rotation directions, the first rotating shaft 8 can be rotatably installed on the first support 3, the second rotating shaft 9 can be rotatably installed on the second support 4, the first rotating shaft 8 is threadedly matched with one end of the screw 7, and the second rotating shaft 9 is threadedly matched with the other end of the screw 7.

[0034] Optionally, since the lead screw nut assembly can be purchased directly from the market, the lead screw 7 is equipped with a lead screw nut 21, the lead screw nut 21 is connected to the first rotating shaft 8, the first rotating shaft 8 is threadedly connected to the lead screw 7 through the lead screw nut 21, the lead screw nut 21 is connected to the second rotating shaft 9, and the second rotating shaft 9 is threadedly connected to the lead screw 7 through the lead screw nut 21. In this embodiment, two lead screw nuts 21 are required. Optionally, the first rotating shaft 8 and the second rotating shaft 9 with internal threads can be directly designed, and the first rotating shaft 8 and the second rotating shaft 9 are directly sleeved on both ends of the lead screw 7. Among them, the lead screw 7 and the first support 3 and the second support 4 can all move relative to each other to meet the inclination of the support plate 2. Optionally, a gasket 20 for limiting is provided at the end of the lead screw 7 to prevent the lead screw 7 from slipping out of the first support 3 or the second support 4. The gasket 20 is mounted on the end of the lead screw 7 with a structure such as a screw or a bolt 16.

[0035] The axis of the first rotating shaft 8 intersects with the axis of the first support 3, and the axis of the second rotating shaft 9 intersects with the axis of the second support 4. Optionally, in this embodiment, the axis of the first rotating shaft 8 is perpendicular to the axis of the first support 3, and the axis of the second rotating shaft 9 is perpendicular to the axis of the second support 4. The bottom plate 1 is always placed horizontally, and the axis of the first support 3 is vertical. Then, the axis of the first rotating shaft 8 is horizontal, and the support plate 2 will be tilted under the action of the tilting component, and the position of the second support 4 relative to the support plate 2 is fixed. At this time, the axis of the second support 4 will change from vertical to tilted to adapt to the tilt of the support plate 2, and the axis of the second rotating shaft 9 is still in a horizontal state.

[0036] A hand wheel 10 is sleeved on the lead screw 7. Turning the hand wheel 10 causes the lead screw 7 to rotate, which can drive the first rotating shaft 8 on the lead screw 7 to rise or fall, thereby driving the support plate 2 to rise and fall, thereby achieving the tilting of the support plate 2.

[0037] A first bracket 11 is provided at one end of the bottom plate 1, and a second bracket 12 is provided at one end of the support plate 2, and the first bracket 11 and the second bracket 12 are hinged by a hinge shaft 13. Optionally, both the first bracket 11 and the second bracket 12 are "["-shaped structures, and the open ends of the two "["-shaped structures are arranged in opposite directions and hinged by the hinge shaft 13, and the flat end of the "["-shaped structure is connected to the bottom plate 1 or the support plate 2. The hinged setting is to achieve micro-rotation when the support plate 2 is tilted. Among them, the first bracket 11 and the bottom plate 1 are connected by structures such as screws and bolts 16. The first bracket 11 and the bottom plate 1 are fixed, and there is no relative movement between the two. The second bracket 12 and the support plate 2 are connected by structures such as screws and bolts 16. The second bracket 12 and the support plate 2 are fixed, and there is no relative movement between the two. The whole of the first bracket 11 and the bottom plate 1 and the whole of the second bracket 12 and the support plate 2 are movable.

[0038] Optionally, a baffle 14 is provided at each end of the support plate 2. The baffle 14 is provided on the upper surface of the support plate 2, and the wheel to be measured is placed on the upper surface of the support plate 2. The baffle 14 is used to block the wheel to be measured and prevent it from slipping out of the support plate 2. The upper surface of the baffle 14 is paved with a friction substrate, and the friction substrate can be connected by fasteners or adhesive.

[0039] Optionally, in this embodiment, the wheel frame 5 is a U-shaped member, one side of the wheel frame 5 has a receiving groove for receiving the wheel to be measured, and the other side of the wheel frame 5 can be placed with a weight 6;

[0040] Rolling members are arranged around one side of the wheel frame 5 , and the rolling members can roll with two side edges of the support plate 2 that are away from each other.

[0041] Optionally, the rolling element is a bearing 15, a pulley or a roller. For example, in this embodiment, the rolling element is a bearing 15.

[0042] In order to achieve the installation and fastening of the wheel to be measured, such as a polyurethane wheel, two opposite sides of the wheel frame 5 are provided with fastening holes, and fasteners are inserted through the fastening holes and the wheel to be measured, so as to install the wheel to be measured on the wheel frame 5. Optionally, the fasteners can be structures such as screws, bolts 16 or pins. Among them, the screws and bolts 16 need to be used with nuts, which will not be described in detail here.

[0043] In a specific embodiment, two fastening holes are provided on both sides of the wheel frame 5, and a fastener such as a bolt 16 is passed through each fastening hole, and each fastener sleeve is provided with two polyurethane wheels 100, and a total of four polyurethane wheels 100 are installed. Preferably, in order to achieve the fastening of the polyurethane wheel 100, each fastener sleeve is provided with a plurality of sleeves, for example, there is a sleeve on each side of the polyurethane wheel 100, and a total of three sleeves are installed for the two polyurethane wheels 100. For example, a first sleeve 17, a second sleeve 18 and a third sleeve 19. The design of the sleeve is only for example and is not used to limit the present invention.

[0044] A protruding column 52 is provided on the other side of the wheel frame 5 , and the protruding column 52 is used for sleeve-mounting the weight 6 .

[0045] When measuring a wheel starting resistance coefficient provided by the present invention:

[0046] The bottom plate 1 is placed on a horizontal plane, and the tilting assembly is operated to make the support plate 2 horizontal. The wheel frame 5 with the wheel to be measured is placed on the friction substrate. The wheel to be measured is in direct contact with the friction substrate. The tilting assembly is operated to tilt the support plate 2 so that the angle between the support plate 2 and the bottom plate 1 gradually increases. The tilt of the support plate 2 increases when the wheel frame 5 starts to move ( Figure 2 When the wheel frame 5 moves to the left (critical point), the downward component force F in the inclined direction generated by the total weight G of the wheel frame 5, the structure inside the wheel frame 5 (such as the polyurethane wheel 100, the bushing, the bolt 16, the nut) and the weight 6 is equal to the sum of the starting resistances of all the polyurethane wheels 100. At this time, the starting resistance coefficient can be calculated.

[0047] In the embodiment with the lead screw 7 in front, first rotate the hand wheel 10 in a first direction, for example, counterclockwise, until it cannot rotate any further. At this time, the limit washers at both ends of the lead screw 7 are in contact with the support plate 2 and the bottom plate 1 respectively, and the support plate 2 is in a horizontal state. The wheel frame 5 equipped with four polyurethane wheels 100 of exactly the same material, structure, and size is placed on the support plate 2 (placed on the right side), and the bearings 15 on both sides of the wheel frame 5 are placed on both sides of the support plate 2 respectively, to restrict the freedom of the wheel frame 5 to move to both sides of the support plate 2. When the hand wheel 10 is rotated in a second direction, for example, clockwise, the two lead screw nuts 21 (the first rotating shaft 8 and the second rotating shaft 9) respectively move away from the hand wheel 10, pushing the support plate 2 to rotate along the axis of the hinge shaft 13, so that the support plate 2 has a certain angle with the horizontal plane. When the wheel frame 5 starts to move ( Figure 2 When the wheel frame 5 moves to the left (critical point), the downward component force F in the inclined direction generated by the total weight G of the wheel frame 5, the structure inside the wheel frame 5 (such as the polyurethane wheel 100, the bushing, the bolt 16, the nut) and the weight 6 is equal to the sum of the starting resistances of all the polyurethane wheels 100. At this time, the starting resistance coefficient can be calculated.

[0048] The component force F divided by the positive pressure N is the starting resistance coefficient of each polyurethane wheel 100. The calculation method of the starting resistance coefficient is as follows: Figure 4 As shown, select two points such as A1 and A2 on the bottom plate 1, find two points B1 and B2 on the support plate 2 that are aligned with A1 and A2 respectively, and the four points form a right-angled trapezoid. Measure the line segments A1A2, B1B2, A1B1 and A2B2, and calculate the angle θ between the support plate 2 and the horizontal plane. When the wheel frame 5 starts to slide, F = G*sinθ, N = G*cosθ, then F divided by N is equal to tanθ, that is, the starting resistance coefficient is equal to tanθ, which can be calculated in the previous section.

[0049] It should be noted that the size and material of all polyurethane wheels 100 must be consistent.

[0050] The present invention provides a wheel starting resistance coefficient measuring device, which places a wheel frame 5 with a weight 6 and a polyurethane wheel 100 on a support plate 2, and tilts the support plate 2 by operating a tilting component. When the wheel frame 5 tilts to the point where it starts to slide, the starting resistance coefficient of each polyurethane wheel 100 is measured and calculated. The starting resistance coefficient of the polyurethane wheel 100 can be quickly measured without the need for a traction device and a force measuring device. The measurement operation is simple and convenient, and the result is accurate.

[0051] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A wheel starting resistance coefficient measuring device, characterized in that: include: A base plate, a support plate, a first support, a second support, a tilting assembly, a wheel frame, and a weight; One end of the base plate is hinged to one end of the support plate, the first support is arranged at the other end of the base plate, the second support is arranged at the other end of the support plate, one end of the tilting component is installed in the first support, and the other end of the tilting component is installed in the second support. The tilting component is used to realize the tilting of the support plate, and the wheel frame is used to install the wheel to be measured and the weight.

2. The wheel starting resistance coefficient measuring device according to claim 1, characterized in that: The tilting assembly includes a screw, a first rotating shaft and a second rotating shaft. One end of the screw extends into the first support, and the other end of the screw extends into the second support. The threads at both ends of the screw have opposite rotation directions. The first rotating shaft can be rotatably mounted on the first support, and the second rotating shaft can be rotatably mounted on the second support. The first rotating shaft is threadedly matched with one end of the screw, and the second rotating shaft is threadedly matched with the other end of the screw.

3. The wheel starting resistance coefficient measuring device according to claim 2, characterized in that: The axis of the first rotating shaft intersects with the axis of the first support, and the axis of the second rotating shaft intersects with the axis of the second support.

4. The wheel starting resistance coefficient measuring device according to claim 2, characterized in that: A hand wheel is sleeved on the lead screw.

5. The wheel starting resistance coefficient measuring device according to any one of claims 1 to 4, characterized in that: A first bracket is arranged at one end of the bottom plate, and a second bracket is arranged at one end of the support plate. The first bracket and the second bracket are hingedly connected via a hinge shaft.

6. The wheel starting resistance coefficient measuring device according to any one of claims 1 to 4, characterized in that: A baffle is respectively arranged at both ends of the supporting plate.

7. The wheel starting resistance coefficient measuring device according to any one of claims 1 to 4, characterized in that: The wheel frame is a U-shaped part, one side of the wheel frame has a receiving groove for receiving the wheel to be measured, and the other side of the wheel frame can be used to place the weight; Rolling members are arranged around one side of the wheel frame, and the rolling members can be rollingly matched with two side edges of the support plate that are away from each other.

8. The wheel starting resistance coefficient measuring device according to claim 7, characterized in that: The rolling element is a bearing, a pulley or a roller.

9. The wheel starting resistance coefficient measuring device according to claim 7, characterized in that: Two opposite side surfaces of the wheel frame are both provided with fastening holes, and fasteners are passed through the fastening holes and the wheel to be measured so as to install the wheel to be measured on the wheel frame.

10. The wheel starting resistance coefficient measuring device according to claim 7, characterized in that: A convex column is arranged on the other side of the wheel frame, and the convex column is used for sleeve-mounting the weight.

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