A device for measuring the travel distance of a track trolley in a greenhouse

Abstract

The invention discloses a device for measuring the travel distance of a track trolley in a greenhouse, comprising: a trolley, a connecting bracket, and a rotating base, wherein the rotating base is rotatably connected to the connecting bracket, a limit plate is fixedly arranged on the connecting bracket, a follower wheel is arranged at one end of the rotating base, the other end of the rotating base is connected to the limit plate through a spring, the follower wheel is connected to an encoder, and a proximity switch is arranged on the connecting bracket. The invention can accurately measure the travel distance of the trolley traveling in the glass greenhouse, effectively avoids the slipping of the wheels of the trolley and other external interferences, accurately realizes the automatic control of the trolley, and improves the working efficiency and operation accuracy of the track traveling equipment in the glass greenhouse.

Description

Technical Field

[0001] The invention mainly relates to the field of trolley travel distance measuring devices, and specifically relates to a track trolley travel distance measuring device in a greenhouse. Background Art

[0002] Large glass greenhouses in modern agriculture all have special circular pipe rails. The circular pipes can be used as heating pipes to provide temperature for the greenhouse, and can also be used as tracks for driving equipment in the greenhouse to achieve automated production. The trolleys driving on the tracks of modern agricultural glass greenhouses need to achieve accurate distance measurement to achieve automated production. In the process of automatic control, the distance that the trolleys travel on the tracks is generally controlled by a combination of wheels and encoders. The principle of distance measurement is that the output shaft of the trolley wheel is directly or indirectly connected to the encoder. When the wheel rotates one circle, the encoder also rotates the corresponding number of circles. The encoder transmits the data to the control system to achieve distance measurement. This method is simple and easy, but the humidity in the glass greenhouse is high, and there are water droplets condensing on the driving track. Once the wheel slips due to low friction during driving, or the wheel slips due to excessive acceleration at the moment of starting, the measured distance will be different from the actual distance; at the same time, the trolleys in the glass greenhouse not only travel on the track, but also need to travel on the horizontal ground. This distance measurement device will also have data feedback on the ground, which will interfere with driving on the track. Summary of the invention

[0003] The invention provides a device for measuring the distance traveled by a track trolley in a greenhouse, the purpose of which is to achieve accurate distance measurement without being affected by wheel slippage when the trolley measures distance; at the same time, the distance measuring device is fixed on the chassis of the trolley, and the distance measurement can be performed only when the trolley is on the track, and the distance measurement is not performed on the ground.

[0004] In order to achieve the intended purpose, the technical solution adopted by the present invention is:

[0005] A device for measuring the travel distance of a track trolley in a greenhouse comprises: a trolley, a connecting bracket, and a rotating base, wherein the rotating base is rotatably connected to the connecting bracket, a limit plate is fixedly arranged on the connecting bracket, a follower wheel is arranged at one end of the rotating base, the other end of the rotating base is connected to the limit plate through a spring, the follower wheel is connected to an encoder, a proximity switch is arranged on the connecting bracket, and the connecting bracket is installed and fixed on the trolley chassis of the traveling trolley. When the trolley travels on a horizontal ground, the follower wheel makes one end of the follower wheel of the rotating base move downward around the rotating shaft under the action of its own gravity and the tension of the spring. When the end of the rotating base hits the limit plate, the follower wheel moves downward around the rotating shaft. When the trolley reaches the limit plate, the rotating base stops floating downward. At this time, the proximity switch cannot detect the rotating base and feeds back the signal to the control system. The system will determine that the trolley is not running on the track at this time, the encoder stops counting, and the limit plate is adjusted to limit the up and down movement distance of the rotating base. When the trolley is running on the track, the track is stuck in the arc groove section and contacts the follower wheel. One end of the follower wheel of the rotating base will fall on the track. The proximity switch detects the signal and sends a signal to the control system to show that the trolley is already on the track. When the trolley is running, the follower wheel follows the trolley to rotate on the track surface and drives the encoder to rotate through the coupling.

[0006] Furthermore, a bearing with a seat is fixedly connected to the rotating base, the follower wheel is connected to the main shaft, the main shaft passes through the bearing with a seat and is connected to a coupling, and the coupling is connected to an encoder.

[0007] Furthermore, the trolley chassis is also provided with wheels, which include an outer end ground contact section, a middle arc groove section, and an inner end connecting section. The wheel diameter of the outer end ground contact section is larger than the wheel diameter of the follower wheel, and the wheel diameter of the groove bottom of the middle arc groove section is smaller than the wheel diameter of the follower wheel.

[0008] Furthermore, the trolley chassis is also provided with wheels, which include an outer arc groove section, a middle ground-contacting section, and an inner connecting section, wherein the wheel diameter of the middle ground-contacting section is larger than the wheel diameter of the follower wheel, and the groove bottom wheel diameter of the outer arc groove section is smaller than the wheel diameter of the follower wheel.

[0009] Preferably, the limiting plate is fixed inside the connecting bracket.

[0010] Preferably, the follower wheel is made of polyurethane material.

[0011] Preferably, the encoder adopts Omron encoder E6B2-CWZ6C.

[0012] Beneficial effects: The present invention can accurately measure the travel distance of the trolley in the glass greenhouse, effectively avoid the slipping of the trolley wheels and other external interference, accurately realize the automatic control of the trolley, and improve the working efficiency and operation accuracy of the track driving equipment in the glass greenhouse. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the state of the present invention when the trolley is running on the track.

[0014] Figure 2 The present invention is in the state when the trolley is off the track and running on the ground.

[0015] Figure 3 It is a stereogram of the present invention.

[0016] Figure 4 This is the structural diagram of the trolley wheel.

[0017] Figure 5 It is a schematic diagram of the connection between the present invention and the chassis of a trolley.

[0018] Figure 6 The position diagram of the follower wheel and the track when the trolley is running on the track.

[0019] Among them: 1, connecting bracket 2, proximity switch 3, rotating base 4, follower wheel 401, main shaft 5, rotating shaft 6, seat bearing 7, coupling 8, encoder 9, spring 10, limit plate 11, trolley 1101, trolley chassis 12, wheel 1201, ground section 1202, arc groove section 1203, connecting section 13 track. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] like Figures 1 to 6As shown, a device for measuring the travel distance of a track trolley in a greenhouse comprises: a trolley 11, a connecting bracket 1, and a rotating base 3, wherein the connecting bracket 1 is fixed on the trolley chassis 1101. The rotating base 3 is rotatably connected to the connecting bracket 1 through a rotating shaft 5, a follower wheel 4 is arranged at one end of the rotating base 3, a bearing 6 with a seat is fixedly connected to the rotating base 3, the follower wheel 4 is connected to the main shaft 401, the main shaft 401 passes through the bearing 6 and is connected to the coupling 7, and the coupling 7 is connected to the encoder 8. A limit plate 10 is fixedly arranged on the connecting bracket 1, and the other end of the rotating base 3 is connected to the limit plate 10 through a spring 9, and a proximity switch 2 is arranged on the connecting bracket 1. The trolley chassis 1101 is also provided with a wheel 12, which includes an outer end ground contact section 1201, a middle arc groove section 1202, and an inner end connecting section 1203. The wheel diameter of the outer end ground contact section 1201 is larger than the wheel diameter of the follower wheel 4, and the wheel diameter of the groove bottom of the middle arc groove section 1202 is smaller than the wheel diameter of the follower wheel 4.

[0023] The wheel 12 structure of the trolley 11 chassis mentioned in the present invention is only one solution. The distribution positions of the ground section 1201, the arc groove section 1202, and the connecting section 1203 mentioned in the above technical solution on the wheel 12 can be adjusted according to the actual situation of the user. For example, the trolley chassis 1101 is also provided with a wheel 12, and the wheel 12 includes an outer arc groove section 1202, a middle ground section 1201, and an inner connecting section 1203. The wheel diameter of the middle ground section 1201 is larger than the wheel diameter of the follower wheel 4, and the groove bottom wheel diameter of the outer arc groove section 1202 is smaller than the wheel diameter of the follower wheel 4. The purpose is to make the track 13 stuck in the arc groove 1202 when the trolley is running on the track 13, and adjust the structural characteristics of the wheel 12 according to the actual width of the track 13. The wheel 12 is integrally processed and formed, and different tracks 13 only need to select different wheels 12. The track 13 is a slender round tube, and the size of the track 13 satisfies the requirement of being stuck in the arc groove segment 1202 .

[0024] Specific working principle: The entire distance measuring device is installed and fixed on the trolley chassis 1101 of the traveling trolley 11 through the connecting bracket 1. When the trolley 11 is traveling on the horizontal ground, the follower wheel 4 moves one end of the follower wheel 4 of the rotating base 3 downward around the rotating shaft 5 under the action of its own gravity and the tension of the spring 9. The result is as follows Figure 2As shown. When the end of the rotating base 3 hits the limit plate 10, the rotating base 3 stops floating downward. At this time, the proximity switch 2 cannot detect the rotating base 3 and feeds back the signal to the control system. The system will determine that the trolley 11 is not running on the track 13 at this time, and the encoder 8 stops counting. Even if foreign objects on the ground cause the follower wheel 4 to rotate at this time, the distance measuring device will not measure and record the travel distance of the trolley. The adjustable limit plate 10 can limit the up and down movement distance of the rotating base 3. In actual use, the position of the limit plate 10 only needs to meet the requirement of ensuring that the follower wheel 4 does not contact the ground. When the trolley 11 is running on the track 13, the track 13 is stuck in the arc groove section 1202 and contacts the follower wheel 4. One end of the follower wheel 4 of the rotating base 3 will fall on the track 13. The proximity switch 2 detects the signal and sends a signal to the control system to show that the trolley 11 is already on the track 13. Figure 1 As shown; due to the bearing effect of the track 13 and the tension of the spring 9, the follower wheel 4 is tightly attached to the surface of the track 13. When the trolley 11 is running, the follower wheel 4 follows the trolley 11 to rotate on the surface of the track 13, and drives the encoder 8 to rotate through the coupling 7. Through the counting feedback of the encoder 8, the actual running distance of the trolley 11 on the track 13 can be accurately measured. Since the device is completely independent of the trolley wheel 12, the slip of the wheel 12 will not have any effect on it, and the surface of the counting follower wheel 4 is made of polyurethane material, which increases the friction between the track 13 while ensuring a certain hardness, avoiding the inaccurate distance measurement caused by the slip of the counting follower roller itself. When the trolley 11 travels from the track 13 to the ground, one end of the follower wheel 4 of the rotating base 3 rotates downward around the rotating shaft 5, and the proximity switch 2 cannot detect a signal, and the measuring device stops the distance measurement function.

[0025] In summary, the present invention achieves the intended purpose.

Claims

1. A device for measuring the travel distance of a track trolley in a greenhouse, characterized in that: include: A trolley, a connecting bracket, and a rotating base, wherein the rotating base is rotatably connected to the connecting bracket, a limit plate is fixedly arranged on the connecting bracket, a follower wheel is arranged at one end of the rotating base, and the other end of the rotating base is connected to the limit plate through a spring, the follower wheel is connected to an encoder, a proximity switch is arranged on the connecting bracket, and the connecting bracket is installed and fixed on the chassis of the traveling trolley. When the trolley is traveling on a horizontal ground, the follower wheel makes one end of the follower wheel of the rotating base move downward around the rotating shaft under the action of its own gravity and the tension of the spring. When the end of the rotating base hits the limit plate, the rotating base Stop floating downward. At this time, the proximity switch cannot detect the rotating base and feeds back the signal to the control system. The system will determine that the trolley is not running on the track at this time, the encoder stops counting, and adjusts the limit plate to limit the up and down movement distance of the rotating base. When the trolley is running on the track, the track is stuck in the arc groove segment and contacts the follower wheel. One end of the follower wheel of the rotating base will fall on the track. The proximity switch detects the signal and sends a signal to the control system to show that the trolley is already on the track. When the trolley is running, the follower wheel follows the trolley to rotate on the track surface and drives the encoder to rotate through the coupling.

2. A greenhouse track trolley travel distance measuring device as claimed in claim 1, characterized in that: The rotating base is fixedly connected to a bearing with a seat, the follower wheel is connected to the main shaft, the main shaft passes through the bearing with a seat and is connected to a coupling, and the coupling is connected to an encoder.

3. A greenhouse track trolley travel distance measuring device as claimed in claim 1, characterized in that: The trolley chassis is also provided with wheels, which include an outer end ground contact section, a middle arc groove section, and an inner end connecting section. The wheel diameter of the outer end ground contact section is larger than the wheel diameter of the follower wheel, and the wheel diameter of the groove bottom of the middle arc groove section is smaller than the wheel diameter of the follower wheel.

4. A greenhouse track trolley travel distance measuring device as claimed in claim 1, characterized in that: The trolley chassis is also provided with wheels, which include an outer arc groove section, a middle ground-contacting section, and an inner connecting section. The wheel diameter of the middle ground-contacting section is larger than the wheel diameter of the follower wheel, and the groove bottom wheel diameter of the outer arc groove section is smaller than the wheel diameter of the follower wheel.

5. A greenhouse track trolley travel distance measuring device as claimed in claim 1, characterized in that: The limiting plate is fixed inside the connecting bracket.

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