Lifting oil cylinder with stroke feedback

Abstract

The utility model discloses a lifting oil cylinder with stroke feedback. Comprising an oil cylinder body, a piston rod arranged in the oil cylinder body, a pull rod head connected with the front end of the piston rod, a front end working oil port, a rear end working oil port, a front end cover fixedly connected with the oil cylinder body and a piston fixedly connected with the piston rod, wherein the front end working oil port and the rear end working oil port are formed in the oil cylinder body; the rear end cover and the displacement sensor are arranged on the oil cylinder body; the rear end cover is provided with an expansion hole communicated with a rodless cavity of the oil cylinder body, a bin installation cavity used for installing the displacement sensor electronic bin, a cable passing hole communicated with the installation cavity, a rear end connecting plate and a rear end connecting hole formed in the rear end connecting plate. The piston rod is provided with a rod installation cavity used for installing a measuring rod of the displacement sensor and a magnetic ring installation cavity. The stroke position of the lifting oil cylinder can be effectively fed back, the problem caused by the position of a rotary blade is avoided, and the working efficiency of the whole rotary cultivator is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cylinders, and particularly relates to a lifting cylinder with stroke feedback. Background Art

[0002] A rotary tiller is a commonly used agricultural machine. For example, a Chinese invention patent with the patent number CN201310598150.2 discloses a hydraulic lifting rotary tilling mechanism, which includes a frame, a rotary tilling component, a hydraulic cylinder and a hydraulic regulating mechanism. The rotary tilling component is connected to the frame through a fixed shaft. One end of the hydraulic cylinder is installed on the frame, and the other end is connected to the rotary tilling component through a rotating shaft. The hydraulic cylinder is also connected to a hydraulic regulating mechanism installed on the frame. The hydraulic regulating mechanism includes a power source, a power take-off, a gear pump, a distribution valve and a hydraulic oil tank. The power source is connected to the power take-off installed on the gear pump. The distribution valve is respectively connected to the two oil ports of the hydraulic cylinder, the hydraulic oil tank and the gear pump through oil pipes. The hydraulic oil tank is connected to the gear pump through an oil pipe.

[0003] During the actual operation process, the rotary tilling component including the rotary tilling blades is lifted and lowered by the lifting cylinder, so as to realize the rotary tilling of the land. When the rotary tiller is working and reaches the end of the field, the rotary tilling blades controlled by the cylinder need to be lifted up to facilitate the vehicle to turn around. After the turning is completed, the rotary tilling blades are lowered by the cylinder again. However, in the actual operation, the phenomenon of being too high or too low often occurs. In the too high position, the rotary tilling depth is not in place. In the too low position, the rotary tilling blades will be damaged. All of these seriously affect the working efficiency of the rotary tiller. Therefore, we need to solve this problem. Summary of the Utility Model

[0004] Technical Problems to be Solved

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a lifting cylinder with stroke feedback, which overcomes the deficiencies of the prior art, ensures the position of the rotary tilling blades through the lifting cylinder, and improves the working efficiency of the rotary tiller.

[0006] Technical Solutions

[0007] To solve the above technical problems, the present utility model provides a lifting oil cylinder with stroke feedback, which includes an oil cylinder body, a piston rod arranged in the oil cylinder body, a pull rod head connected to the front end of the piston rod, a front end working oil port and a rear end working oil port arranged on the oil cylinder body, a front end cover fixedly connected to the oil cylinder body, and a piston fixedly connected to the piston rod; it further includes a rear end cover and a displacement sensor arranged on the oil cylinder body. The rear end cover is provided with an expansion hole communicating with the rodless cavity of the oil cylinder body, a cavity installation cavity for installing the electronic bin of the displacement sensor, a cable through hole communicating with the installation cavity, a rear end connecting plate, and a rear end connecting hole arranged on the rear end connecting plate. The piston rod is provided with a rod installation cavity and a magnetic ring installation cavity for installing the measuring rod of the displacement sensor.

[0008] As a further preferred technical solution of the present utility model; the rear end cover is provided with an internal threaded hole communicating with the cavity installation cavity, a plug threaded hole communicating with the internal threaded hole, a set screw arranged in the internal threaded hole for limiting the electronic bin of the displacement sensor, and a plug arranged in the plug threaded hole.

[0009] As a further preferred technical solution of the present utility model; the rear end cover is provided with a guiding installation body matched with the oil cylinder body and a pressure equalizing column connected to the guiding installation body. There is a pressure equalizing gap between the pressure equalizing column and the rodless cavity of the oil cylinder body.

[0010] As a further preferred technical solution of the present utility model; a plurality of oil grooves are evenly distributed on the end face of the pressure equalizing column, and the oil grooves communicate with the expansion hole.

[0011] As a further preferred technical solution of the present utility model; the length of the pressure equalizing column is 2-3 times the length of the guiding installation body.

[0012] As a further preferred technical solution of the present utility model; the diameter of the expansion hole gradually increases as it approaches the piston.

[0013] As a further preferred technical solution of the present utility model; an installation guiding cavity is arranged at the end of the rod installation cavity, and the diameter of the installation guiding cavity gradually decreases as it approaches the rod installation cavity.

[0014] Beneficial effects

[0015] Compared with the prior art, the present utility model can effectively feedback the stroke position of the lifting oil cylinder, avoid problems caused by the position of the rotary tillage knife, and ensure the working efficiency of the entire rotary tiller. Brief description of the drawings

[0016] Figure 1 It is a structural schematic diagram of the present utility model;

[0017] Figure 2 Schematic diagram of the installation of the rear end cover and displacement sensor in the present utility model;

[0018] Figure 3 is Figure 2 Partial enlarged view at position C in Specific implementation manner

[0019] This specific implementation manner is a lifting oil cylinder with stroke feedback, and its structural schematic diagram is as Figures 1-3 shown. The lifting oil cylinder with stroke feedback includes an oil cylinder body 1, a piston rod 2 arranged in the oil cylinder body 1, a pull rod head 3 connected to the front end of the piston rod 2, a front working oil port A and a rear working oil port B arranged on the oil cylinder body 1, a front end cover 4 fixedly connected to the oil cylinder body 1, and a piston 5 fixedly connected to the piston rod 2; since the above technical features are all prior arts, they will not be described in detail here. The applicant found in actual work that when the existing lifting oil cylinder drives the rotary tillage blade to adjust, the situation that the rotary tillage blade is actually not in place often occurs. This non - in - place situation involves two cases. One is that the position of the rotary tillage blade is too high, which makes the tillage depth insufficient. The other is that the position of the rotary tillage blade is too low, which makes the tillage too deep and even causes damage to the rotary tillage blade. This situation often occurs when the rotary tiller turns around because when turning around, the rotary tillage blade needs to be lifted first and then lowered after turning around. At this time, the phenomenon that the rotary tillage blade is not in place often appears, which seriously affects the tillage efficiency. It also includes a rear end cover 6 and a displacement sensor 7 arranged on the oil cylinder body 1. The rear end cover 6 is provided with an expansion hole 601 communicating with the rodless cavity of the oil cylinder body 1, a chamber installation cavity 602 for installing the electronic chamber of the displacement sensor 7, a cable through - hole 603 communicating with the installation cavity, a rear end connecting plate 604, and a rear end connecting hole 605 arranged on the rear end connecting plate 604. The piston rod 2 is provided with a rod installation cavity 201 for installing the measuring rod of the displacement sensor 7 and a magnetic ring installation cavity 202. The side rod installation cavity is used to install the side rod of the displacement sensor, the magnetic ring installation cavity is used to install the magnetic ring of the position sensor, and the chamber installation cavity is used to install the electronic chamber of the position sensor. By using the displacement sensor to determine the position of the piston rod, the precise control of the position of the oil cylinder can be realized, ensuring the accurate position of the rotary tillage blade.

[0020] Further, to ensure the working efficiency of the rotary tiller, the rear end cover 6 is provided with an internal screw hole 606 communicating with the bin installation cavity 602, a plug screw hole 607 communicating with the internal screw hole, a set screw 608 disposed in the internal screw hole 606 for limiting the electronic bin of the displacement sensor 7, and a plug 609 disposed in the plug screw hole 607. The set screw further fixes the electronic bin in the bin installation cavity to prevent it from moving. At the same time, the plug screw hole is provided with a plug to protect the set screw 608.

[0021] Further, to ensure the normal operation of the position sensor, the rear end cover 6 is provided with a guiding installation body 610 cooperating with the oil cylinder body 1 and a pressure equalizing column 611 connected to the guiding installation body 610. There is a pressure equalizing gap X between the pressure equalizing column 611 and the rodless cavity of the oil cylinder body 1. The existence of the pressure equalizing gap enables the incoming hydraulic oil to act on the pressure equalizing column evenly. Further, the length of the pressure equalizing column 611 is 2-3 times the length of the guiding installation body 610.

[0022] Further, a plurality of oil grooves 612 are evenly distributed on the end face of the pressure equalizing column 611. The oil grooves 612 communicate with the expansion hole 601. The depth of the oil grooves is 0.5-1 mm. One end of the oil groove communicates with the expansion hole, and the other end communicates with the outer circumferential surface of the pressure equalizing column.

[0023] In this embodiment, the diameter of the expansion hole 601 gradually increases as it approaches the piston 5; an installation guiding cavity 203 is provided at the end of the rod installation cavity 201, and the diameter of the installation guiding cavity 203 gradually decreases as it approaches the rod installation cavity 201.

[0024] All technical features in this embodiment can be freely combined according to actual needs.

[0025] The above embodiments are the preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. Lifting oil cylinder with stroke feedback, comprising an oil cylinder body (1), a piston rod (2) arranged in the oil cylinder body (1), a pull rod head (3) connected to the front end of the piston rod (2), a front end working oil port (A) and a rear end working oil port (B) arranged on the oil cylinder body (1), a front end cover (4) fixedly connected to the oil cylinder body (1), and a piston (5) fixedly connected to the piston rod (2); characterized in that: It further includes a rear end cover (6) and a displacement sensor (7) provided on the cylinder body (1). The rear end cover (6) is provided with an expansion hole (601) communicating with the rodless cavity of the cylinder body (1), a chamber installation cavity (602) for installing the electronic chamber of the displacement sensor (7), a cable through hole (603) communicating with the installation cavity, a rear end connecting plate (604), and a rear end connecting hole (605) provided on the rear end connecting plate (604). The piston rod (2) is provided with a rod installation cavity (201) for installing the measuring rod of the displacement sensor (7) and a magnetic ring installation cavity (202).

2. The lifting oil cylinder with stroke feedback according to claim 1, wherein: The rear end cover (6) is provided with an internal thread hole (606) communicating with the chamber installation cavity (602), a plug thread hole (607) communicating with the internal thread hole, a set screw (608) provided in the internal thread hole (606) for limiting the electronic chamber of the displacement sensor (7), and a plug (609) provided in the plug thread hole (607).

3. A lifting oil cylinder with stroke feedback according to claim 1, characterized in that: The rear end cover (6) is provided with a guiding installation body (610) cooperating with the cylinder body (1) and a pressure equalizing column (611) connected to the guiding installation body (610). There is a pressure equalizing gap between the pressure equalizing column (611) and the rodless cavity of the cylinder body (1).

4. The lifting oil cylinder with stroke feedback according to claim 3, wherein: A plurality of oil grooves (612) are evenly distributed on the end face of the pressure equalizing column (611), and the oil grooves (612) communicate with the expansion hole (601).

5. The lifting oil cylinder with stroke feedback according to claim 3, characterized in that: The length of the pressure equalizing column (611) is 2-3 times the length of the guiding installation body (610).

6. A lifting oil cylinder with stroke feedback according to claim 1 or 2 or 3 or 4, characterized in that: The diameter of the expansion hole (601) gradually increases as it approaches the piston (5).

7. A lifting oil cylinder with stroke feedback according to claim 1 or 2 or 3 or 4, characterized in that: An installation guiding cavity (202) is provided at the end of the rod installation cavity (201), and the diameter of the installation guiding cavity (202) gradually decreases as it approaches the rod installation cavity (201).

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