CN107986197B

CN107986197B - Forklift hydraulic system and cold chain forklift with same

Info

Publication number: CN107986197B
Application number: CN201711281906.5A
Authority: CN
Inventors: 李广龙; 陈晓宇; 杨继强; 王泽国
Original assignee: Anhui Industrial Vehicle Co Ltd Of Zhong Lianchong Section
Current assignee: Anhui Industrial Vehicle Co Ltd Of Zhong Lianchong Section
Priority date: 2017-12-07
Filing date: 2017-12-07
Publication date: 2020-02-18
Anticipated expiration: 2037-12-07
Also published as: CN107986197A

Abstract

The invention discloses a hydraulic system of a forklift, which comprises an oil tank and a moisture filtering respirator assembly arranged at an air inlet of the oil tank and used for absorbing moisture in air entering the oil tank. According to the forklift hydraulic system, the wet filtering respirator assembly is arranged, so that moisture and solid particles in air are removed when the air passes through the wet filtering respirator assembly in a low-temperature environment, the moisture and the solid particles are effectively prevented from invading an oil tank, the working performance and the reliability of the hydraulic system are improved, and the service lives of oil and equipment are prolonged. The invention also provides a cold chain forklift.

Description

Forklift hydraulic system and cold chain forklift with same

Technical Field

The invention belongs to the technical field of forklifts, and particularly relates to a hydraulic system of a forklift and a cold chain forklift with the hydraulic system.

Background

With the rapid development of cold-chain logistics, the demand of the refrigeration storage is continuously increased, and the design and application of logistics equipment in a low-temperature environment become hot spots concerned in the industry. As the key equipment of freezer commodity circulation transport, cold chain fork truck plays important role in the freezer operation. Because the particularity of freezer environment, air humidity is big when must considering cold chain fork truck operation under low temperature environment, and steam is many, in case mix into water in the hydraulic oil, not only causes the emulsification of hydraulic oil, more can exert an influence to hydraulic element's life-span and service efficiency. This requires that the hydraulic system of the cold chain forklift needs to be designed specifically to suit the environment of the cold storage.

To current cold chain fork truck that uses under the cold chain environment, mainly adopt the mode of heating hydraulic oil to get rid of the moisture in the hydraulic medium, adopt this kind of mode, can reach better effect to getting rid of moisture, nevertheless have certain loss to the electric quantity of fork truck battery, and steam collection device structure is complicated, also too high to the space requirement of fork truck. In the environment of a refrigeration house where the cold chain forklift is located, air is moist and low in temperature, and moisture enters a hydraulic system to cause certain damage to stability and accuracy of a hydraulic element and the system; the low-temperature humid environment corrodes standard parts, oil cylinders, steel pipes, oil pipe joints and the like on a hydraulic system to a certain extent, the hydraulic system is easy to harden and deteriorate in sealing, and the flowing performance of hydraulic oil is poor.

The mechanical performance of a hydraulic system of the forklift can be affected by the long-time damage, and certain threat can be caused to personal safety.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a forklift hydraulic system and a cold chain forklift with the same, and aims to improve the working performance and reliability of the hydraulic system.

In order to achieve the purpose, the invention adopts the technical scheme that: the forklift hydraulic system comprises an oil tank and a moisture filtering respirator assembly which is arranged at an air inlet of the oil tank and is used for absorbing moisture in air entering the oil tank.

The wet filtering respirator assembly comprises a wet filtering device support and a respirator body arranged on the wet filtering device support.

The moisture filter support is connected with a forklift frame.

The moisture filtering respirator assembly further comprises a moisture filter joint connected with the respirator body and a respirator pipe connected with the moisture filter joint and the oil tank.

The moisture filter joint is in threaded connection with the respirator body.

The respirator body includes the shell body, makes the air carry out the first gaseous diffusion piece that diffuses, carries out filterable first filter core, carries out dry drier, carries out filterable second filter core once more and carries out the second gaseous diffusion piece that diffuses once more to the air, and the shell body has the breathing hole, and first gaseous diffusion piece, first filter core, drier, second filter core and second gaseous diffusion piece set up in the inside of shell body and for starting arranging in proper order from the breathing hole.

The first gas diffusion member and the second gas diffusion member are made of sponge.

The respirator body still including set up in the inside respiratory mask of shell body, respiratory mask has lets the expansion room that filtered and air after the drying got into, and the volume size of expansion room is adjustable.

The shell body and the respiratory mask are both made of elastomer materials.

The invention also provides a cold chain forklift which comprises the forklift hydraulic system.

According to the forklift hydraulic system, the wet filtering respirator assembly is arranged, so that moisture and solid particles in air are removed when the air passes through the wet filtering respirator assembly in a low-temperature environment, the moisture and the solid particles are effectively prevented from invading an oil tank, the working performance and the reliability of the hydraulic system are improved, and the service lives of oil and equipment are prolonged.

Drawings

The description includes the following figures, the contents shown are respectively:

FIG. 1 is a schematic diagram of the forklift hydraulic system of the present invention;

FIG. 2 is a schematic structural view of a moisture-filtering respirator assembly;

FIG. 3 is an exploded schematic view of a moisture-filtering respirator assembly;

FIG. 4 is a cross-sectional view of a respirator body;

FIG. 5 is a schematic view of the construction of a moisture filter holder;

FIG. 6 is a schematic view of the construction of the moisture filter adapter;

FIG. 7 is a schematic structural view of a lift cylinder;

FIG. 8 is a schematic diagram of the hydraulic circuit;

labeled as: 1. a hydraulic pump; 2. a diverter; 3. a steering cylinder; 4. a multi-way valve; 5. inclining the oil cylinder; 6. a lifting oil cylinder; 601. a piston rod; 602. a cylinder body; 7. an oil tank; 8. a moisture-filtering respirator assembly; 801. an outer housing; 802. a breathing hole; 803. a first gas diffusion member; 804. a first filter element; 805. a desiccant; 806. a second gas diffusion member; 807. an expansion chamber; 808. a respiratory mask; 809. a second filter element; 810. a respirator body; 811. a limiting plate; 812. a dehumidifier support; 813. a moisture filter joint; 814. a ventilator tube; 815. a hose clamp; 816. an air duct; 817. a threaded connection; 818. an inlet and outlet hole; 10. a pipe joint; 11. a first oil pipe; 12. a second oil pipe.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.

As shown in fig. 1 to 3, the present invention provides a forklift hydraulic system suitable for a cold chain forklift, which mainly comprises a hydraulic pump 1, an oil tank 7 and a moisture filtering respirator assembly 8 arranged at an air inlet of the oil tank 7 and used for absorbing moisture in air entering the oil tank 7, wherein the oil tank 7 is used for storing hydraulic oil, and the hydraulic pump 1 is used for pumping the hydraulic oil in the oil tank 7 to hydraulic elements of the forklift.

Specifically, the oil tank 7 has an air inlet, and the moisture-filtering respirator assembly 8 is used for drying and filtering air entering the oil tank 7, and the air dried and filtered by the moisture-filtering respirator assembly 8 enters the oil tank 7 through the air inlet. Like this when fork truck moves in low temperature environment, when the wet respirator assembly 8 of air-passing filter, moisture and solid particle in the air are got rid of, effectively prevent moisture and solid particle invasion oil tank 7, are favorable to improving hydraulic system's working property and reliability, prolong the life of fluid and equipment. The energy-saving and environment-friendly hydraulic oil tank has the effects of saving energy and protecting environment, reduces the power consumption of a storage battery, and can radically solve the problem of oil water inflow in a low-temperature environment, thereby avoiding the emulsification of hydraulic oil and the damage of hydraulic elements.

As shown in fig. 1-4, the moisture-filtering respirator assembly 8 includes a moisture-filter holder 812 and a respirator body 810 disposed on the moisture-filter holder 812. The moisture filter support 812 is connected with the forklift frame, the moisture filter support 812 is installed on the frame of the cold chain forklift through bolts, the respirator body 810 is installed on the moisture filter support 812, and the respirator body 810 is used for drying and filtering air. The respirator body 810 comprises an outer shell 801, a first air diffuser 803 for diffusing air, a first filter element 804 for filtering air, a drying agent 805 for drying air, a second filter element 809 for re-filtering air and a second air diffuser 806 for re-diffusing air, wherein the outer shell 801 is provided with a breathing hole 802, and the first air diffuser 803, the first filter element 804, the drying agent 805, the second filter element 809 and the second air diffuser 806 are arranged in the outer shell 801 and are arranged in sequence from the breathing hole 802. The outer shell 801 is a hollow cylinder structure, the first gas diffusing member 803, the first filter element 804, the drying agent 805, the second filter element 809 and the second gas diffusing member 806 are disposed in a hollow inner cavity of the outer shell 801, the outer shell 801 has a breathing hole 802 for allowing air in the external environment to pass through, the breathing hole 802 is disposed at one axial end of the outer shell 801, the breathing hole 802 penetrates through the side wall of the end of the outer shell 801 in the axial direction, the breathing hole 802 is provided in plurality, and the plurality of breathing holes 802 are uniformly distributed in the circumferential direction by taking the axis of the outer shell 801 as a center line.

As shown in fig. 4, the first gas diffuser 803, the first filter element 804, the drying agent 805, the second filter element 809 and the second gas diffuser 806 are sequentially arranged from the breathing hole 802 toward the inside of the outer housing 801 along the axial direction of the outer housing 801, and the air in the external environment enters the first gas diffuser 803 through the breathing hole 802, the first gas diffusion member 803 serves to disperse air and to allow the air to uniformly and smoothly enter the first filter element 804, the first filter element 804 is used for filtering solid particles such as dust contained in the air, the air after the first filtration enters the drying agent 805, the desiccant 805 absorbs moisture in the air, the dried air enters the second filter element 809, the second filter 809 is also used to filter solid particles such as dust in the air, the air after the second filtration enters the second gas diffusion member 806, the second gas diffusion member 806 serves to re-diffuse the air after the two times of filtering and drying. The material of the first gas diffusion member 803 and the second gas diffusion member 806 is preferably sponge, the first gas diffusion member 803 and the second gas diffusion member 806 have a certain thickness, the first gas diffusion member 803 and the second gas diffusion member 806 are circular ring structures, the first gas diffusion member 803 and the second gas diffusion member 806 are coaxially arranged with the outer shell 801, and the outer circular surfaces of the first gas diffusion member 803 and the second gas diffusion member 806 are attached to the inner circular surface of the outer shell 801. The provision of the first gas diffusion member 803 and the second gas diffusion member 806 helps to improve the drying and filtering effect of the air. The filtering precision of the first filter element 804 and the second filter element 809 is 3 μm, and the filtering precision of the filter elements is high, so that the air filtering effect can be improved, and the working performance and the reliability of the hydraulic system can be further improved. The first filter element 804 is located above the first gas diffusing member 803, the first filter element 804 is a circular ring structure, the first filter element 804, the first gas diffusing member 803 and the second gas diffusing member 806 are coaxially disposed, and an outer circumferential surface of the first filter element 804 is attached to an inner circumferential surface of the outer housing 801. The desiccant 805 is positioned over the first filter element 804, the primary component of the desiccant 805 is silica gel with a color indicating color, and the desiccant 805 gradually changes from blue to red as the moisture absorption of the desiccant 805 increases. The second filter element 809 is located above the drying agent 805, the second filter element 809 is in a circular ring structure, the second filter element 809 and the first filter element 804 are coaxially arranged, the outer circular surface of the second filter element 809 is attached to the inner circular surface of the outer shell 801, the second gas diffusion member 806 is located above the second filter element 809, and the first gas diffusion member 803 is located above the breathing hole 802.

As shown in FIG. 4, the respirator body 810 further comprises a respirator 808 and an airway tube 816 disposed within the outer shell 801, the respirator 808 having an expansion chamber 807 for filtered and dried air to enter, the expansion chamber 807 being adjustable in volume. The outer shell 801 has an inlet/outlet hole 818 for allowing air to pass through, the inlet/outlet hole 818 and the breathing hole 802 are disposed at the same end of the outer shell 801, the inlet/outlet hole 818 is axially disposed on the side wall of the end portion of the outer shell 801, air filtered and dried by the respirator body 810 flows through the inlet/outlet hole 818 to the air inlet of the oil tank 7, and the air duct 816 is used for guiding the air entering the expansion chamber 807 to the inlet/outlet hole 818. The air duct 816 is a hollow tube with two open ends, the first air diffuser 803, the second air diffuser 806, the first filter element 804 and the second filter element 809 are sleeved on the air duct 816 and are coaxially arranged with the air duct 816, the outer circular surface of the air duct 816 is attached to the inner circular surfaces of the first air diffuser 803, the second air diffuser 806, the first filter element 804 and the second filter element 809, the drying agent 805 is arranged around the air duct 816 in a circle outside the air duct 816, and the drying agent 805 is sandwiched between the first filter element 804 and the second filter element 809. In the axial direction of the outer shell 801, the air duct 816 is positioned between the access hole 818 and the respiratory mask 808, the central hole of the air duct 816 is communicated with the expansion chamber 807 and the access hole 818, the diameter of the central hole of the air duct 816 is larger than that of the access hole 818, and the central hole of the air duct 816 and the access hole 818 are coaxially arranged.

Preferably, as shown in fig. 4, the outer shell 801 and the respiratory mask 808 are made of elastomer materials, the outer shell 801 and the respiratory mask 808 have a certain amount of telescopic deformation, and both the outer shell 801 and the respiratory mask 808 can expand and contract along the axial direction, so that the reliability of air breathing is ensured. The respiratory mask 808 is positioned over the second gas dispersion member 806, and the second gas dispersion member 806 is sandwiched between the respiratory mask 808 and the second filter element 809. The respiratory mask 808 is a structure with an open end and a hollow interior, the open end of the respiratory mask 808 faces the second filter element 809, the diameter of the open end of the respiratory mask 808 is larger than the diameter of the central hole of the air duct 816, the hollow inner cavity of the respiratory mask 808 is an expansion chamber 807, and air which is dispersed again by the second air diffuser 806 enters the expansion chamber 807 and then enters the air duct 816.

Preferably, the material of the outer shell 801 is transparent, and the outer shell 801 is transparent, so that the state change of the drying agent 805 inside can be observed conveniently, and the color change caused by the state change of the drying agent 805 can be seen clearly.

As shown in fig. 2-6, the moisture-filtering respirator assembly 8 further includes a moisture filter fitting 813 connected to the respirator body 810 and a respirator tube 814 connected to the moisture filter fitting 813 and to the fuel tank 7. One end of the moisture filter joint 813 is connected with the respirator body 810, and the other end of the moisture filter joint 813 is connected with the respirator pipe 814. The respirator pipe 814 is positioned below the moisture filter bracket 812, one end of the respirator pipe 814 is connected with the moisture filter joint 813, the other end of the respirator pipe 814 is connected with the oil tank 7 at the air inlet of the oil tank 7, and the moisture filter joint 813 and the respirator pipe 814 guide the filtered and dried air in the respirator body 810 into the oil tank 7.

Preferably, the moisture filter joint 813 is in threaded connection with the respirator body 810, so that the assembly and disassembly are convenient. As shown in fig. 4, the outer case 801 has a threaded connection portion 817 to which the moisture filter joint 813 is connected, the threaded connection portion 817 is provided with an external thread, the moisture filter joint 813 has an internal thread hole into which the threaded connection portion 817 is inserted, and the threaded connection portion 817 and the access hole 818 are provided at the same end of the outer case 801.

As shown in fig. 2 to 5, the respirator body 810 is arranged vertically, the moisture filtering respirator assembly 8 further comprises a limiting plate 811 for limiting the respirator body 810, so as to prevent the respirator body 810 from moving up and down, and the limiting plate 811 is sandwiched between the respirator body 810 and the moisture filter bracket 812. Limiting plate 811 has and lets and strain the first hole of dodging that wetter joint 813 male, strain wetter support 812 and have and let and strain wetter joint 813 male second and dodge the hole, first hole and the second of dodging dodge the hole and dodge the hole for the round hole and first and second and dodge the hole and be coaxial setting, first hole of dodging is located the second top of dodging the hole, it connects 813 to strain the wetter and inserts the second in proper order from bottom to top and dodge hole and first dodge the hole, shell body 801 inserts in the top of limiting plate 811 downwards and strains in wetter joint 813, realize and strain the fixed connection that wetter 813 connects. Preferably, the limiting plate 811 is fixedly connected to the dehumidifier support 812 by bolts.

As shown in fig. 2 and fig. 3, preferably, both ends of the respirator tube 814 are fixedly connected with the moisture filter joint 813 and the oil tank 7 through a throat hoop 815, so that the respirator tube is convenient to assemble and disassemble. The breather pipe 814 is an L-shaped structure, and the breather pipe 814 is used for preventing hydraulic oil in the oil tank 7 from immersing into the breather body 810 during shaking.

Preferably, the hydraulic oil adopted by the forklift hydraulic system is L-HV32 low-temperature hydraulic oil, and the L-HV32 low-temperature hydraulic oil has low kinematic viscosity, is suitable for an environment with the temperature of no less than-30 ℃, and is suitable for forklift hydraulic systems with large low-temperature areas or temperature change ranges and harsh working conditions.

As shown in fig. 1, the basic principle of the forklift hydraulic system of the present invention is as follows: the hydraulic pump 1 pumps hydraulic oil from an oil tank 7 to enter a steering gear 2, the hydraulic oil is distributed in the steering gear 2, when the forklift needs to turn, the hydraulic oil enters a steering oil cylinder 3, when the forklift inclines and lifts, the hydraulic oil enters a multi-way valve 4, and the hydraulic oil is controlled by the multi-way valve 4 to respectively flow into an inclined oil cylinder 5 and a lifting oil cylinder 6.

Preferably, the lifting oil cylinder 6 is a full-liquid oil cylinder, so that condensed water generated after air enters the oil cylinder can be prevented from entering hydraulic oil. As shown in fig. 7, the lift cylinder 6 mainly includes a cylinder body 602 and a piston rod 601, the piston rod 601 is inserted into the cylinder body 602, one end of the piston rod 601 is located inside the cylinder body 602, and the other end of the piston rod 601 is located outside the cylinder body 602. The maximum cross section diameter of the piston rod 601 is smaller than the inner diameter of the cylinder body 602, so that the whole cylinder body 602 can be filled with hydraulic oil, and the problem that condensed water enters the hydraulic oil after air enters the cavity of the common cylinder is solved. The piston rod 601 of the lifting oil cylinder 6 is processed by a chromium plating process, and a chromium plating layer is formed on the surface of the piston rod 601, so that the surface hardness and the rust-proof function of the piston rod 601 are improved, the piston rod 601 is in a working state for a long time and exposed in humid air, and the piston rod can be protected by the chromium plating layer, so that the rust-proof effect is achieved.

As shown in fig. 8, the forklift hydraulic system of the present invention further includes a first oil pipe 11, a second oil pipe 12 and a pipe joint 10, which are connected in sequence, the second oil pipe 12 is a flexible pipe, two ends of the second oil pipe 12 are respectively connected with the first oil pipe 11 and the pipe joint 10 through joints, and the joints at two ends of the second oil pipe 12, the pipe joint 10 and the first oil pipe 11 are all made of stainless steel, so as to achieve an antirust effect.

The invention also provides a cold chain forklift which comprises the forklift hydraulic system. The specific structure of the forklift hydraulic system can refer to fig. 1 to 8, and details are not repeated herein. Since the cold chain forklift of the present invention includes the forklift hydraulic system in the above-described embodiment, it has all the advantages of the forklift hydraulic system described above.

The invention is described above with reference to the accompanying drawings. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.

Claims

1. Fork truck hydraulic system, including the oil tank with be arranged in with the hydraulic pump in the hydraulic component of cold chain fork truck is pumped to hydraulic oil in the oil tank, its characterized in that: the moisture filtering respirator assembly is arranged at the air inlet of the oil tank and is used for absorbing moisture in air entering the oil tank;

the moisture filtering respirator assembly comprises a moisture filter support and a respirator body arranged on the moisture filter support, the respirator body comprises an outer shell, a first air diffusion piece for diffusing air, a first filter core for filtering the air, a drying agent for drying the air, a second filter core for filtering the air again and a second air diffusion piece for diffusing the air again, the outer shell is provided with a breathing hole for allowing the air in the external environment to pass through, and the first air diffusion piece, the first filter core, the drying agent, the second filter core and the second air diffusion piece are arranged in the outer shell and are sequentially arranged from the breathing hole;

the respirator body also comprises a respirator arranged in the outer shell and positioned above the second gas diffusion piece and a gas guide pipe arranged in the outer shell, the respirator is provided with an expansion chamber for allowing filtered and dried air to enter, the outer shell and the respirator can expand and contract along the axial direction, and the volume of the expansion chamber is adjustable; the outer shell is provided with an inlet and outlet hole through which air passes, the air filtered and dried by the respirator body flows to an air inlet of the oil tank through the inlet and outlet hole, the air guide pipe is used for guiding the air entering the expansion chamber to the inlet and outlet hole, the first air diffusion piece, the second air diffusion piece, the first filter element and the second filter element are sleeved on the air guide pipe and are coaxially arranged with the air guide pipe, the drying agent is arranged around the air guide pipe for a circle at the outer side of the air guide pipe, and the drying agent is clamped between the first filter element and the second filter element; in the axial direction of the outer shell, the air duct is positioned between the inlet and outlet hole and the respirator, and the central hole of the air duct is communicated with the expansion chamber and the inlet and outlet hole.

2. The forklift hydraulic system of claim 1, wherein: the moisture filter support is connected with a forklift frame.

3. The forklift hydraulic system of claim 1, wherein: the wet filtering respirator assembly further comprises a wet filtering device joint connected with the respirator body and a respirator pipe connected with the wet filtering device joint and the oil tank.

4. The forklift hydraulic system of claim 3, wherein: the moisture filter joint is in threaded connection with the respirator body.

5. The forklift hydraulic system of any one of claims 1 to 4, wherein: the breathing hole sets up a plurality ofly and this a plurality of breathing holes is for the axis of outer casing along circumference evenly distributed for the central line.

6. The forklift hydraulic system of any one of claims 1 to 4, wherein: the first gas diffusion member and the second gas diffusion member are made of sponge.

7. The forklift hydraulic system of any one of claims 1 to 4, wherein: the shell body and the respiratory mask are both made of elastomer materials.

8. The forklift hydraulic system of claim 7, wherein: the shell body is made of transparent materials.

9. The forklift hydraulic system of claim 3, wherein: the moisture filtering respirator assembly comprises a respirator body, a moisture filtering respirator support and a moisture filtering respirator assembly, wherein the respirator body is vertically arranged, the moisture filtering respirator assembly further comprises a limiting plate used for limiting the respirator body, and the limiting plate is clamped between the respirator body and the moisture filtering respirator support; the limiting plate has and lets wet ware joint male first hole of dodging, wet ware support of straining has and lets wet ware joint male second dodge the hole, first hole and the second of dodging dodge the hole for the round hole and first hole and the second of dodging dodge the hole and be coaxial setting, first hole of dodging is located the second top of dodging the hole, wet ware joint inserts the second from bottom to top in proper order and dodges the hole and first dodge the hole, the shell body inserts wet ware joint in the top of limiting plate is downwards, the limiting plate passes through bolt fixed connection with wet ware support of straining.

10. Cold chain fork truck, its characterized in that: comprising a forklift hydraulic system as claimed in any one of claims 1 to 9.