Automatic tensioning system for crawler walking of sugarcane harvester

Abstract

The utility model provides an automatic tensioning system for crawler walking of a cane harvester. The automatic tensioning system comprises a guide wheel, a tensioning mechanism, a pressure sensor, an electromagnetic control valve, an oil inlet pipe, an oil return pipe, an oil pump and an oil tank. The fixed end of the tensioning mechanism is connected with the track beam, the free end of the tensioning mechanism is connected with the guide wheel, the guide wheel is matched with the track assembly, the electromagnetic control valve is connected with a grease system of the tensioning mechanism and connected with the oil inlet pipe and the oil return pipe, and the oil inlet pipe and the oil return pipe are both communicated with the oil tank. The pressure sensor is arranged in the tensioning mechanism to obtain oil pressure signals of the tensioning mechanism and is in electric signal connection with the electromagnetic control valve, and the oil pump is arranged between the oil inlet pipe and a pipeline of the oil tank and is in electric signal connection with the electromagnetic control valve. The pressure value of the oil cavity of the tensioning mechanism can be set according to different working conditions, the crawler belt is adjusted to be in the most suitable working state, and the set oil cavity pressure can be constantly kept in the working process.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sugarcane harvester technical field, specifically is a kind of for sugarcane harvester track walking automatic tensioning system. BACKGROUND

[0002] Traditional sugarcane harvester track tensioning mechanism provides pressure compression spring by manual oiling, spring provides thrust to track tensioning mechanism, when track is slack, oil nozzle is rotated to release oil chamber pressure, so as to release spring and reduce thrust, such as the track tensioning device on the sugarcane harvester disclosed in Chinese patent CN206719345U, yellow grease is added to the inside of plunger cylinder from oil inlet, since plunger cylinder and piston are sealing structure, internal pressure forces piston to move to one end, push plate moves, push plate will compress spring, and under the guidance of walking cavity, spring exerts pressure on spring push plate, push guide wheel support, so that guide wheel and track maintain good tensioning relationship.

[0003] But the manual oiling mode of prior art has many problems: released grease cannot be reused;Tensioning mechanism oil chamber pressure cannot display accurate value, under different working conditions, oil chamber pressure cannot be accurately adjusted to adjust to suitable working tensioning state. And track appears over-tight or over-loose during working process, traditional track tensioning mechanism cannot monitor and automatically adjust oil chamber pressure to keep set value, easily cause track component wear to aggravate, reduce service life. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of for sugarcane harvester track walking automatic tensioning system, can set tensioning mechanism oil chamber pressure value according to different working conditions, adjust track to the state most suitable for working, can keep the set oil chamber pressure at any time during working process.

[0005] A kind of for sugarcane harvester track walking automatic tensioning system, including guide wheel, tensioning mechanism, pressure sensor, electromagnetic control valve, oil inlet pipe, oil return pipe, oil pump and oil tank;The fixed end of tensioning mechanism is connected with track beam, the free end of the tensioning mechanism is connected with guide wheel, the guide wheel and track assembly cooperate, electromagnetic control valve connects the grease system of the tensioning mechanism, the electromagnetic control valve connects the oil inlet pipe and the oil return pipe, the oil inlet pipe and the oil return pipe are all communicated with the oil tank, the pressure sensor is arranged in tensioning mechanism and obtains the oil pressure signal of tensioning mechanism, the pressure sensor and the electromagnetic control valve are electric signal connection, the oil pump is arranged between oil inlet pipe and the pipeline of oil tank, the oil pump and the electromagnetic control valve are electric signal connection.

[0006] The pressure sensor can monitor the oil pressure of the tensioning mechanism, and when the pressure is too high, the pressure sensor outputs a signal to control the electromagnetic control valve to open the oil outlet to return oil and release pressure; when the pressure is lower than the design value, the pressure sensor outputs a signal to control the electromagnetic valve to open the oil inlet, and simultaneously transmits the signal to the oil pump to supply oil to the oil cavity, so that automatic adjustment of the track tension and relaxation is realized.

[0007] Specifically, the tensioning mechanism comprises a cylinder, a piston rod in sliding fit with the cylinder, and an oil cavity arranged at one end inside the cylinder.

[0008] Preferably, the tensioning mechanism is connected with the free end of the piston rod through a U-shaped bracket, the opening of the U-shaped bracket is directed to the left, the U-shaped bracket is connected with the guide wheel, and a spring is arranged on the piston rod and abuts against the right side of the U-shaped bracket.

[0009] In the utility model, specifically, the cylinder and the piston rod are both arranged horizontally.

[0010] In the utility model, the guide wheel is arranged at the most front end of the track assembly.

[0011] In addition, a working method of the automatic track tensioning system of the sugarcane harvester comprises the following steps:

[0012] S1: identifying the working condition of the sugarcane harvester, and obtaining the pressure threshold of the tensioning mechanism of the track under the working condition;

[0013] S2: the pressure sensor detects the pressure of the grease system inside the tensioning mechanism, and transmits the pressure signal P to the electromagnetic control valve; the pressure signal P reflects the tensioning or relaxation degree of the track.

[0014] S3: the electromagnetic control valve compares the pressure signal P with the pressure threshold, the pressure threshold comprises a first pressure threshold P1 and a second pressure threshold P2, and P1 < P2; if the pressure signal P < P1, the step S4 is entered; if P > P2, the step S5 is entered; if P1 < P < P2, the original state is kept unchanged;

[0015] S4: the electromagnetic control valve opens the oil inlet, the electromagnetic control valve controls the oil pump to work, the grease sequentially passes through the oil tank, the oil pump, the oil inlet pipe and the oil inlet to enter the oil cavity until P > P1, and this step is oil pumping and pressurizing;

[0016] S5: the electromagnetic control valve opens the oil outlet, and the grease is sequentially passed through the oil outlet, the oil return pipe and enters the oil tank until P < P2, and this step is oil discharge pressure reduction.

[0017] The track tensioning device main body according to the internal oil cavity pressure tension or relaxation of the track, the pressure sensor detects the track tensioning device main body oil cavity pressure value and outputs a signal, the electromagnetic valve control circuit transmits the signal of the pressure sensor to the electromagnetic control valve, the electromagnetic control valve controls the oil inlet and oil outlet of the track tensioning device main body, the oil return pipe returns the grease to the oil tank when the track needs to be relaxed, the oil tank stores the grease, the oil pump pumps oil when receiving the signal of the pressure sensor, and the oil inlet pipe delivers the grease to the tensioning device main body when the track needs to be tensioned, and the oil pump control circuit controls the transmission of the pressure sensor signal to the oil pump to perform the oil pumping work.

[0018] The step 1 further includes the step that the driver adjusts the first pressure threshold P1 and the second pressure threshold P2 through the display of the cab according to the obtained working condition data.

[0019] In the utility model, the working condition is divided into clay working condition, sandy soil working condition and marshy land working condition according to the road condition of the sugarcane harvester working.

[0020] The utility model has the advantages of the following:

[0021] The method solves the problem that the tensioning device cannot keep the appropriate tensioning force at all times, and the system keeps the track walking in the appropriate tensioning state, keeps the four-wheel one-track in the appropriate load state, reduces the additional wear of the four-wheel one-track due to the track relaxation, and prolongs the service life of the four-wheel one-track.

[0022] The track automatic tensioning mechanism can automatically tension the track when a certain amount of grease is injected into the oil tank and the oil cavity pressure value is set on the display, the tensioning degree can be adjusted by changing the value, and the track automatic tensioning mechanism is convenient and labor-saving.

[0023] The grease of the tensioning system is circulated through oil inlet and oil return, and the problem that the grease cannot be reused is solved.

[0024] The automatic track tensioning mechanism can set the oil cavity pressure value of the tensioning mechanism according to different working conditions, adjust the track to the most suitable working state, and keep the set oil cavity pressure at all times during the working process. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural schematic view of an automatic track tensioning system for a sugarcane harvester according to the present application.

[0026] Figure 2 is a structural schematic view of a tensioning mechanism according to the present application.

[0027] Figure 3 is a method flow chart of an automatic track tensioning method according to the present application.

[0028] In the figure: 1-track assembly, 2-guide wheel, 3-tensioning mechanism, 4-pressure sensor, 5-solenoid valve control circuit, 6-solenoid control valve, 7-oil return pipe, 8-oil tank, 9-oil pump, 10-oil inlet pipe, 11-oil pump control circuit, 12-track beam, 301-cylinder barrel, 302-piston rod, 303-oil cavity, 304-spring, 305-U-shaped frame. DETAILED DESCRIPTION

[0029] The present application will be further described below in conjunction with the drawings and specific embodiments, and the schematic embodiments and the description thereof are used to explain the present application and do not constitute an improper limitation on the present application.

[0030] In the description of the present application, it should be understood that the terms "left", "right", "up", "down", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or structure must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] Example 1:

[0032] As Figure 1 and Figure 2As shown, an automatic tensioning system for a sugarcane harvester track belt includes a guide wheel 2, a tensioning mechanism 3, a pressure sensor 4, an electromagnetic control valve 6, an oil inlet pipe 10, an oil return pipe 7, an oil pump 9, and an oil tank 8. The fixed end of the tensioning mechanism 3 is connected to a track beam 12, the free end of the tensioning mechanism 3 is connected to the guide wheel 2, the guide wheel 2 cooperates with the track assembly 1, the electromagnetic control valve 6 is connected to the grease system of the tensioning mechanism 3, the electromagnetic control valve 6 is connected to the oil inlet pipe 10 and the oil return pipe 7, the oil inlet pipe 10 and the oil return pipe 7 are both connected to the oil tank 8, the pressure sensor 4 is arranged in the tensioning mechanism 3 to obtain the oil pressure signal of the tensioning mechanism, the pressure sensor 4 and the electromagnetic control valve 6 are electrically connected, the oil pump 9 is arranged between the oil inlet pipe 10 and the oil tank 8, and the oil pump 9 and the electromagnetic control valve 6 are electrically connected.

[0033] In this embodiment, the tensioning mechanism 3 includes a cylinder barrel 301, a piston rod 302 slidingly fitted with the cylinder barrel 301, and an oil cavity 303 arranged at one end inside the cylinder barrel 301. The oil cavity 303 is connected to the electromagnetic control valve 6, and the pressure sensor 4 is arranged on the inner wall of the oil cavity 303 after penetrating the cylinder barrel 301. The pressure sensor 4 is signal-connected to the electromagnetic valve control line 5 and the electromagnetic valve controller, and the oil pump 9 is signal-connected to the oil pump 9 control line and the electromagnetic valve controller.

[0034] In this embodiment, the tensioning mechanism 3 is connected to the free end of the piston rod 302 through a U-shaped bracket 305, the U-shaped bracket 305 is open to the left, the U-shaped bracket 305 is connected to the guide wheel 2, and the right side of the U-shaped bracket 305 abuts against a spring 304 sleeved on the piston rod 302.

[0035] In this embodiment, the cylinder barrel 301 and the piston rod 302 are both arranged horizontally, the guide wheel 2 is arranged at the most front end of the track assembly 1, i.e., the guide wheel 2 is arranged at the leftmost end, the guide wheel 2 is moved to the left to realize tensioning, and is moved to the right to realize relaxation.

[0036] In this embodiment, according to the tensioning or relaxation of the track assembly 1 by the internal oil cavity 303 pressure, the pressure sensor 4 detects the oil cavity 303 pressure value and outputs a pressure signal, the electromagnetic valve control line 5 transmits the pressure sensor 4 signal to the electromagnetic valve, the electromagnetic control valve 6 controls the oil inlet and outlet of the track tensioning device main body, the oil return pipe 7 returns grease to the oil tank 8 when the track needs to be relaxed, the oil tank 8 stores grease, the oil pump 9 pumps oil when receiving the pressure sensor 4 signal, the oil inlet pipe 10 delivers grease to the tensioning device main body when the track needs to be tensioned, and the oil pump 9 control line controls the transmission of the pressure sensor 4 signal to the oil pump 9 for pumping work.

Claims

1. A self-tensioning system for a cane harvester track, characterised in that The invention relates to a track assembly (1) comprising a guide wheel (2), a tensioning mechanism (3), a pressure sensor (4), an electromagnetic control valve (6), an oil inlet pipe (10), an oil return pipe (7), an oil pump (9) and an oil tank (8); the fixed end of the tensioning mechanism (3) is connected to a track beam (12), the free end of the tensioning mechanism (3) is connected to the guide wheel (2), the guide wheel (2) cooperates with the track assembly (1), the electromagnetic control valve (6) is connected to the grease system of the tensioning mechanism (3), the electromagnetic control valve (6) is connected to the oil inlet pipe (10) and the oil return pipe (7), the oil inlet pipe (10) and the oil return pipe (7) are both connected to the oil tank (8), the pressure sensor (4) is arranged in the tensioning mechanism (3) to obtain the oil pressure signal of the tensioning mechanism, the pressure sensor (4) and the electromagnetic control valve (6) are electrically connected, the oil pump (9) is arranged between the oil inlet pipe (10) and the oil tank (8), and the oil pump (9) and the electromagnetic control valve (6) are electrically connected.

2. An automatic tensioning system for a cane harvester track according to claim 1, characterised in that The tensioning mechanism (3) comprises a cylinder barrel (301), a piston rod (302) slidingly fitted with the cylinder barrel (301), and an oil cavity (303) arranged at one end inside the cylinder barrel (301); the oil cavity (303) is connected to the electromagnetic control valve (6), and the pressure sensor (4) is arranged on the inner wall of the oil cavity (303) after penetrating the cylinder barrel (301).

3. An automatic tensioning system for a cane harvester track according to claim 2, characterised in that The tensioning mechanism (3) is connected to the free end of the piston rod (302) through a U-shaped bracket (305), the opening of the U-shaped bracket (305) faces left, the U-shaped bracket (305) is connected to the guide wheel (2), and the right side of the U-shaped bracket (305) abuts against a spring (304) sleeved on the piston rod (302).

4. An automatic tensioning system for a cane harvester track according to claim 2, characterised in that: Both the cylinder barrel (301) and the piston rod (302) are arranged horizontally.

5. An automatic tensioning system for a cane harvester track according to claim 2, characterised in that: The guide wheel (2) is arranged at the most front end of the track assembly (1).

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