Crank Power Meter Test Benchmark System

Abstract

The present invention proposes a crank power meter test reference system, including a main frame, including a vertical rod, a chain crank mounting system installed on the top of the main frame, the crank is installed on the chain crank mounting system during testing, and a suspension rod is hung on the crank end; a weight group, including a plurality of weights stacked on each other, the top weight is hung on the bottom of the suspension rod; the weights are hung on each other through a suspension structure; a lifting platform, the weight group is placed on the lifting platform; an electronic control unit is used to drive the motor. The entire equipment structure of the present invention is reasonable and compact. For the first time, an automated design concept is proposed in the industry. The lifting platform is driven up and down by a motor to lift and unload weights of different weights, so that different weights exert force on the crank to deform the crank, which truly simulates the pedaling of the crank by both feet during outdoor riding. It no longer relies on manual movement to increase or decrease weights, which improves efficiency.

Description

Technical Field

[0001] The invention belongs to the field of mechanical equipment, and in particular relates to a crank power meter test reference system. Background Art

[0002] One of the main indicators for judging the quality of a bicycle is its speed, that is, the amount of power required when riding a bicycle. Currently, the cycling power is mainly measured by a crank power meter. Most crank power meters on the market currently use a method of hanging a fixed weight to calibrate the power meter measurement benchmark. Specifically, the crank is fixed by a crank mounting system, and force is applied to the crank end by adding or removing weights to simulate the force generated by a person when riding. Based on the force changes of the simulated strain gauge on the crank, the power generated by the simulated person when riding is obtained, thereby verifying the accuracy of the power meter.

[0003] The above system has the following defects:

[0004] The existing method of simulating force is to manually move weights. The process is as follows: a tray is hung on the crank end, and the weights are manually moved to the tray. One simulation is 200kg. The weight of each weight is 10kg. The defects of manually moving the weights are: A. Due to the need to move them repeatedly and the heavy weight, the efficiency is low and the operator is easily injured. In practice, operators often sprain their bodies; B. When placing the weights manually on the tray, the operation accuracy is low and it is easy to put them off, thus affecting the accuracy of the simulated force. Summary of the invention

[0005] The existing crank power meter test benchmark system mostly simulates force by manually moving weights, which leads to low efficiency, easy injury to operators and low operation accuracy. The present invention proposes a fully automatic crank power meter test benchmark system.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A crank power meter test reference system comprises: a main frame, comprising a vertical rod, a chain crank mounting system is installed on the top of the main frame, the crank is installed on the chain crank mounting system during testing, and a suspension rod is hung on the crank end; a weight group, comprising a plurality of weights stacked on each other, the uppermost weight is hung on the bottom end of the suspension rod; the weights are hung on each other through a suspension structure, when the bottom of the weight is not subject to an upward supporting force, the weight is freely suspended under the previous weight; a lifting platform, the weight group is placed on the lifting platform, and the lifting and lowering of the lifting platform driven by a motor is realized to apply or cancel the upward supporting force on the weight group; an electronic control unit is used to drive the motor.

[0008] Furthermore, the lifting platform includes a supporting plate and a vertical sliding rod, and the supporting plate is sleeved on the vertical sliding rod.

[0009] Furthermore, a truncated table piece is arranged at the bottom end of the suspension rod, and two inverted L-shaped pieces are symmetrically arranged on the uppermost weight of the weight group.

[0010] Furthermore, the weight group includes a weight body and a suspension structure, the weight body has a concave portion at the bottom; the top is either provided with a convex portion that cooperates with the concave portion, or is provided as a hanging structure; the middle part has an active cavity that passes through the concave portion; the suspension structure includes a stop portion and a fixed portion, the stop portion can move up and down in the active cavity, and the fixed portion is fixed on the convex portion of another weight.

[0011] Furthermore, the suspension structure includes a T-shaped piece and a screw, the T-shaped piece has a screw hole with a central hole. During installation, the upper end of the T-shaped piece is located in the movable cavity, and the lower end extends out of the concave portion and is assembled on the convex portion of the next weight. The screw passes through the screw hole and is screwed on the convex portion of the weight.

[0012] Furthermore, the chain crank mounting system includes a crank horizontal fixing tool and a chain tensioning platform. The crank horizontal fixing tool includes a tool body, a pressure block and a horizontal hole. The crank is movably installed on the tool body through the pressure block. After adjusting the level, a weight is suspended at one end through a suspension rod, and the other end is fixed by a horizontal positioning shaft inserted into the horizontal hole.

[0013] Furthermore, the chain tensioning platform includes: a support seat and a sliding seat above it, the sliding seat includes a fixed block, a sliding block, a stopper and a rotating handle from left to right, one end of the lead screw is fixed to the fixed block, passes through the sliding block and the stopper and is connected to the rotating handle, a vertical piece is provided on the sliding block, one end of the chain is fixed to the vertical piece, and the other end is fixed to the support seat.

[0014] Furthermore, the electronic control unit includes an MCU controller, and an up switch, a down switch and a reset switch electrically connected to the MCU controller, and the MCU controller controls the forward, reverse and stop of the motor according to the received up switch, down switch and reset switch signals.

[0015] Furthermore, it includes a toothed plate installed on the vertical rod, and the electronic control unit also includes a U-shaped beam sensor installed on the support plate to cooperate with the toothed plate to sense the rising and falling distance of each / group of weights; two photoelectric sensors are installed on the vertical rod up and down to sense the maximum rising height and minimum falling height of the support plate.

[0016] Furthermore, the motor is a three-phase asynchronous motor.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are:

[0018] The crank power meter test benchmark system of the present invention has a reasonable and compact design of the entire equipment structure. It is the first time that the industry has proposed an automated design concept. The motor drives the lifting platform to rise and fall to lift and unload weights of different weights, thereby realizing that different weights exert force on the crank to deform the crank, which truly simulates the pedaling of the crank by both feet during outdoor riding. It no longer relies on manual movement to increase or decrease weights, which improves efficiency. At the same time, because the weight group is neatly placed on the lifting platform in advance, the force centers of each weight are in the same straight line, and there will be no offset phenomenon during loading and unloading, thereby improving operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a front view of a crank power meter test reference system according to an embodiment of the present invention;

[0020] Figure 2 A three-dimensional diagram of a crank power meter test reference system according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of a weight set according to an embodiment of the present invention;

[0022] Figure 4 for Figure 3 The weight set is shown in a sectional view along the AA line;

[0023] Figure 5 The chain tensioning platform of the embodiment of the present invention is a three-dimensional Figure 1 ;

[0024] Figure 6 The chain tensioning platform of the embodiment of the present invention is a three-dimensional Figure 1 ;

[0025] In the above figures:

[0026] 1. Main frame; 101. Vertical rod;

[0027] 2. Lifting platform; 201. Pallet; 202. Vertical slide bar; 203. Screw rod; 204 Pallet

[0028] 3. Motor;

[0029] 4. Weight set; 41. Weight body; 411. Concave platform; 412. Active cavity; 413. Boss platform; 414. Hanging structure; 4141. Inverted L-shaped piece; 42. T-shaped piece; 43. Screw;

[0030] 5. Electronic control unit;

[0031] 6. Suspension rod; 601. Round table piece;

[0032] 7. Crank;

[0033] 8. Crank horizontal fixing tool; 801. Tool body; 802. Press block; 803. Horizontal hole;

[0034] 9. Chain tensioning platform; 91. Support seat; 92. Sliding seat; 921. Fixed block; 922. Sliding block; 923. Stopper; 924. Locking device; 925. Rotating handle; 93. Lead screw; 94. Vertical piece; 95. Sliding block guide rod;

[0035] 10. Chain; 12. Tooth plate; 121. Comb teeth; 13. Horizontal positioning shaft. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1, Reference Figure 1 and Figure 2 The crank dynamometer test reference system of this embodiment includes: a main frame 1, a lifting platform 2, a motor 3, a weight set 4, a suspension rod 6, a chain crank mounting system, and an electronic control unit 5.

[0038] The main frame 1 includes a whole frame composed of a horizontal bar and six vertical bars 101. The six vertical bars 101 divide the space inside the frame into two parts, the left side is the lifting part of the weight group 4, and the right side is the electric control part, including the electric control unit 5 for driving the motor. The main frame 1 is installed with a chain crank mounting system.

[0039] The lifting platform 2 is used to support the weight group 4, including a support plate 201, a vertical slide bar 202, the support plate 201 is mounted on the vertical slide bar 202, the bottom end of the support plate 201 is a top plate 204, the top plate 204 is connected to the driving screw 203, the motor 3 rotates and outputs power to convert it into a driving force for the screw 203 to drive the top plate 204 to further drive the support plate 201 to rise or fall under the guidance of the vertical slide bar 202. In order to increase stability, there are four vertical slide bars 202, which are mounted at the four corners of the support plate 201, so as to ensure the stability of the weight group 4 when rising and falling.

[0040] refer to Figure 3 and Figure 4 The weight group 4 includes a plurality of weights stacked on each other, and the top weight is hung on the bottom end of the suspension rod 6; the weights are hung on each other through the suspension structure 414, and when the bottom of the weight is not supported by the upward support force, the weight is freely suspended under the previous weight.

[0041] During the test, first fix the two ends of the chain 8 to the chain crank mounting system, adjust the level, install the pedal shaft to the crank, connect the pedal shaft to the weight group 4 with the suspension rod 6, and drive the lifting platform 2 up / down through the motor 3 to realize automatic mounting of different weights.

[0042] The weight of this embodiment can realize the loading and unloading of weights of different weights by controlling the start and stop and the forward and reverse rotation of the motor. In actual control, the start and stop of the motor can be controlled according to the moving distance of the support plate by setting a scale on the side of the weight group.

[0043] Example 2, reference Figure 3 and Figure 4 This embodiment proposes a weight set 4, including a weight body 41 and a hanging structure 414, the weight body 41 has a concave portion 411 at the bottom; the top is either provided with a convex portion 413 that cooperates with the concave portion 411, or is provided as a hanging structure 414; the middle part has an active cavity 412 that passes through the concave portion 411; the hanging structure 414 includes a stopper and a fixing portion, the stopper can move up and down in the active cavity, and the fixing portion is fixed on the convex portion of another weight.

[0044] The weights in the weight group 4 are stacked on each other when placed, and the top weight needs to be hung on the bottom end of the suspension rod 6, so the top weight is set as a hanging structure 414. The design of the hanging structure 414 must cooperate with the bottom end of the suspension rod. A hook can be set at the bottom end of the suspension rod 6, and a matching ring is set on the top of the weight. In order to facilitate quick hanging, this embodiment has a truncated table piece 601 at the bottom end of the suspension rod 6, and two inverted L-shaped pieces 4141 are symmetrically provided on the top weight of the weight group 4.

[0045] The weights at the lower end of the weight group 4 are sequentially hung on each other through the suspension structure, and are automatically hung when the supporting force is unloaded. This embodiment realizes the sleeve through the simplest suspension structure, including a T-shaped piece 42 and a screw 43. The T-shaped piece 42 has a screw hole with a central hole. When installed, the upper end of the T-shaped piece 42 is located in the active cavity 412, and the lower end extends out of the concave platform 411 to be assembled on the convex platform 413 of the next weight. The screw 43 passes through the screw hole and is screwed on the convex platform 413 of the weight. The concave and convex parts of the upper and lower weights cooperate to play a positioning role, ensuring that the gravity of each weight is located in the same straight line when stacked.

[0046] When the gravity of the weight group fully acts on the support plate 201, due to the cooperation of the concave and convex structures, the gap between the weights is almost zero. When the lowest weight is not supported by the support plate, the convex part of the lower weight is separated from the concave part of the upper weight.

[0047] The weight set of this embodiment realizes automatic suspension when the external force is unloaded, and further realizes automatic loading and unloading of different forces. The structure design is simple and can be applied to the first embodiment and other systems that require loading force.

[0048] Example 3, reference Figure 5 and Figure 6This embodiment proposes a chain crank mounting system, including a crank horizontal fixing tool 8 and a chain tensioning platform 9. The crank horizontal fixing tool 8 includes a tool body 801, a pressure block 802 and a horizontal hole 803. The crank 7 is movably installed on the tool body 801 through the pressure block 802. After adjusting the level, a weight is hung on one end through a suspension rod 6, and the other end is fixed by a horizontal positioning shaft 12 inserted into the horizontal hole. The chain tensioning platform 9 includes: a support seat 91 and a sliding seat 92 above it. The sliding seat 92 includes a fixed block 921, a slider 922, a stopper 923, a locking device 924 and a rotating handle 925 from left to right. One end of the lead screw 93 is fixed on the fixed block 921, passes through the slider 922 and the stopper 923, and is connected to the rotating handle 925. The slider 922 is provided with a vertical piece 94. When in use, the first end of the chain 10 is fixed on the vertical piece 94, and the tail end is fixed on the support seat 91. The rotating handle 925 rotates, drives the slider 922 to tighten the chain 10, and then locks the lead screw 93 through the locking device 924. In order to enhance the stability of the slider 922 during movement, it also includes a slider guide rod 95, which is respectively located on both sides of the lead screw 93, one end of which is fixed on the fixed block 921, passes through the slider 922, and is fixed on the stopper 923.

[0049] During the test, the chain 10 is fixed at both ends on the chain tensioning platform 9, locked with nuts, and placed for rotation; after the left / right crank is adjusted to be horizontal, the chain 10 is further tightened and fixed by rotating the handle 925. This adjustment method is simple and fast and can be applied to the first embodiment or the second embodiment and other systems that require adjustment of the tensioning force.

[0050] Embodiment 4: This embodiment proposes a crank power meter test benchmark control system based on the hardware equipment of embodiment 1, embodiment 2 or embodiment 3, including a tooth plate 12 installed on the vertical rod 101, and a U-shaped counter-beam sensor installed on the support plate 201, which cooperates with the tooth plate 12 to sense the rising and falling distance of each / group of weights. The tooth plate 12 of this embodiment includes a plurality of comb teeth 12 arranged at intervals. When the weights are freely stacked together, and when the weights are freely suspended under the previous weight, the distance between the two adjacent weights at two moments is the distance between the two comb teeth 121. The tooth plate 12 is vertically placed in the U-shaped counter-beam sensor, and moves up and down in the U-shaped counter-beam sensor to transmit the sensed comb signal to the MCU controller; the MCU controller further converts the number and weight of the loaded weights, and realizes automatic loading and unloading of weights on demand in turn.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A crank power meter test reference system, characterized in that include: The main frame includes a vertical rod, a chain crank mounting system is installed on the top of the main frame, the crank is installed on the chain crank mounting system during testing, and a suspension rod is hung on the crank end; The weight set includes a plurality of weights stacked on each other, the uppermost weight being hung on the bottom of the suspension rod; the weights are hung on each other through a suspension structure, and when the bottom of a weight is not supported upward, the weight hangs freely under the previous weight; A lifting platform, wherein the weight group is placed on the lifting platform, and the lifting and lowering of the lifting platform is driven by a motor to apply or remove an upward supporting force on the weight group; An electronic control unit, used to drive the motor; The weight group includes a weight body and a suspension structure, wherein the weight body has a concave portion at the bottom; the top is either provided with a convex portion cooperating with the concave portion, or is provided as a hanging structure; the middle part has an active cavity that passes through the concave portion; the suspension structure includes a stopper and a fixed portion, the stopper can move up and down in the active cavity, and the fixed portion is fixed on the convex portion of another weight.

2. The crank power meter test reference system according to claim 1, characterized in that The lifting platform comprises a support plate and a vertical sliding rod, and the support plate is mounted on the vertical sliding rod.

3. The crank power meter test reference system according to claim 1, characterized in that A truncated table is provided at the bottom end of the suspension rod, and two inverted L-shaped parts are symmetrically provided on the uppermost weight of the weight group.

4. The crank power meter test reference system according to claim 1, characterized in that :The suspension structure includes a T-shaped piece and a screw. The T-shaped piece has a screw hole with a central hole. When installed, the upper end of the T-shaped piece is located in the movable cavity, and the lower end extends out of the concave portion and is assembled on the convex portion of the next weight. The screw passes through the screw hole and is screwed on the convex portion of the weight.

5. The crank dynamometer test reference system according to claim 1, 2 or 3, characterized in that :The chain crank mounting system includes a crank horizontal fixing tool and a chain tensioning platform. The crank horizontal fixing tool includes a tool body, a pressure block and a horizontal hole. The crank is movably installed on the tool body through the pressure block. After adjusting the level, a weight is hung on one end through a suspension rod, and the other end is fixed by a horizontal positioning shaft inserted into the horizontal hole.

6. The crank power meter test reference system according to claim 5, characterized in that :The chain tensioning platform includes: a support seat and a sliding seat above it, the sliding seat includes a fixed block, a slider, a stopper and a rotating handle from left to right, one end of the lead screw is fixed on the fixed block, passes through the slider and the stopper and is connected to the rotating handle, a vertical piece is provided on the slider, one end of the chain is fixed on the vertical piece, and the other end is fixed on the support seat.

7. The crank power meter test reference system according to claim 2, characterized in that The electric control unit includes an MCU controller, and an upward switch, a downward switch and a reset switch electrically connected to the MCU controller. The MCU controller controls the forward, reverse and stop of the motor according to the received upward switch, downward switch and reset switch signals.

8. The crank power meter test reference system according to claim 7, characterized in that: It includes a toothed plate installed on the vertical rod, and the electric control unit also includes a U-shaped beam sensor installed on the support plate to cooperate with the toothed plate to sense the rising and falling distance of each / group of weights; two photoelectric sensors are installed on the vertical rod up and down to sense the maximum rising height and the minimum falling height of the support plate.

9. The crank power meter test reference system according to claim 1, characterized in that :The motor is a three-phase asynchronous motor.

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