Descending vibration reduction oil way system of heavy electric forklift

Abstract

The utility model relates to the technical field of forklifts, and discloses a heavy electric forklift descending vibration reduction oil way system, which comprises a main hydraulic system and a vibration reduction valve block, and is characterized in that the main hydraulic system is connected and communicated with the vibration reduction valve block, a lifting oil way pressure sensor is fixedly arranged at the joint of the main hydraulic system and the vibration reduction valve block, and the lifting oil way pressure sensor is connected with the vibration reduction valve block. A left lifting oil cylinder and a right lifting oil cylinder are symmetrically arranged on the two sides of the vibration reduction valve block, a first energy accumulator and a second energy accumulator are symmetrically arranged on the top of the vibration reduction valve block, a third throttling valve is communicated between the vibration reduction valve block and the first energy accumulator in series, and a fourth throttling valve is communicated between the vibration reduction valve block and the second energy accumulator in series. According to the utility model, the energy-saving effect during forklift driving is realized, the driving comfort is better, the impact of a lifting hydraulic system is reduced, the service life of core components such as rollers of a lifting system is prolonged, the system is better applicable to severe working conditions, and the operation and maintenance cost of customers is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fork truck, especially to heavy electric fork truck descending damping oil circuit system. BACKGROUND

[0002] The heavy electric fork truck hoisting system produces different amplitude shaking and vibration under different load and different working condition when descending, which leads to large shaking of the whole vehicle, and the main defects are: first, the whole vehicle vibrates greatly, the driver is not comfortable to operate and is easy to be tired; second, the shaking is large, the life of the roller in the hoisting system gantry under the adverse working condition will be shortened, the roller is extremely easy to be subjected to large variable load under extreme working condition, which leads to the roller being broken; third, frequent vibration leads to large pressure fluctuation of the main system, directly increases the load fluctuation of the adaptive motor, and increases the energy consumption in the whole working condition.

[0003] In order to solve the above problems, the heavy electric fork truck descending damping oil circuit system is designed. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving one of the technical problems in the related art at least to some extent. Therefore, one purpose of the utility model is to propose the heavy electric fork truck descending damping oil circuit system, which is energy-saving, better in driving comfort, reduces the impact of the lifting hydraulic system, prolongs the service life of the core components of the hoisting system such as the roller, is better suitable for adverse working conditions, and reduces the customer operation and maintenance cost.

[0005] The heavy electric fork truck descending damping oil circuit system according to the utility model comprises a main hydraulic system and a damping valve block, the main hydraulic system is connected with the damping valve block, a lifting oil circuit pressure sensor is fixedly installed at the connection of the main hydraulic system and the damping valve block, left lifting oil cylinders and right lifting oil cylinders are symmetrically arranged on the two sides of the damping valve block, accumulators one and two are symmetrically arranged on the top of the damping valve block, a throttle valve three is connected in series between the damping valve block and the accumulator one, and a throttle valve four is connected in series between the damping valve block and the accumulator two.

[0006] The damping valve block comprises a throttle valve one, a throttle valve two, a one-way valve one, a one-way valve two and a two-position two-way proportional electromagnetic valve, the throttle valve one and the one-way valve one are connected in series to form a branch oil circuit one, the throttle valve two and the one-way valve two are connected in series to form a branch oil circuit two, and the branch oil circuit one and the branch oil circuit two are connected in parallel and connected with the two-position two-way proportional electromagnetic valve.

[0007] Preferably, a plurality of interfaces are arranged on the surface of the damping valve block, which are P1, P2, P3, B1 and B2 respectively, one end of the left lifting oil cylinder is provided with an interface Y1, one end of the right lifting oil cylinder is provided with an interface Y2, one end of the accumulator one is provided with an interface X1, and one end of the accumulator two is provided with an interface X2.

[0008] Preferably, the main hydraulic system is connected to P1, the interface Y1 of the left lifting oil cylinder is connected to P2, the interface Y2 of the right lifting oil cylinder is connected to P3, the accumulator one is connected to B1, and the accumulator two is connected to B2.

[0009] Preferably, the two ends of the two-position two-way proportional electromagnetic valve are respectively provided with interfaces D1 and D2, both interfaces D1 and D2 are two-way interfaces, D1 is connected to B1 and B2, and D2 is connected to the one-way valve one and the one-way valve two.

[0010] Preferably, the two ends of the throttle valve one are respectively provided with interfaces J1 and J2, the two ends of the one-way valve are respectively provided with interfaces J3 and J4, the two ends of the throttle valve two are respectively provided with interfaces J5 and J6, the two ends of the one-way valve two are respectively provided with interfaces J7 and J8, the two ends of the throttle valve three are respectively provided with interfaces J9 and J10, and the two ends of the throttle valve four are respectively provided with interfaces J11 and J12.

[0011] The beneficial effects in the utility model are:

[0012] 1. The system is more energy-saving, energy recovery is realized through the setting of the accumulator one and the accumulator two, energy reuse is realized, and energy-saving effect is realized.

[0013] 2. The driving comfort is better, the impact of the lifting hydraulic system is reduced, the energy absorption capacity of the oil circuit is realized by using the designed damping valve block, and the purpose of reducing the impact of the hydraulic oil circuit system is achieved.

[0014] 3. The service life of core components such as rollers of the lifting system is prolonged, the system is better suitable for harsh working conditions, the operation and maintenance cost of customers is reduced, the vibration of the system core components is reduced by reducing the impact of the oil circuit system, the working amplitude of each element in the system is small, the purpose of protecting each component is achieved, and the effect of prolonging the service life of the equipment is finally realized. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model provides a schematic diagram of the heavy electric fork truck descending damping oil circuit system.

[0016] In the drawing: 1, damping valve block; 2, throttle valve one; 3, one-way valve one; 4, throttle valve two; 5, one-way valve two; 6, two-position two-way proportional electromagnetic valve; 7, throttle valve three; 8, throttle valve four; 9, accumulator one; 10, accumulator two; 11, left lifting oil cylinder; 12, right lifting oil cylinder; 13, lifting oil circuit pressure sensor; 14, main hydraulic system. DETAILED DESCRIPTION

[0017] Refer to Figure 1The heavy electric forklift descending damping oil path system comprises a main hydraulic system 14 and a damping valve block 1, the main hydraulic system 14 is connected with the damping valve block 1, a lifting oil path pressure sensor 13 is fixedly installed at the connection of the main hydraulic system 14 and the damping valve block 1, left lifting oil cylinders 11 and right lifting oil cylinders 12 are symmetrically arranged on the two sides of the damping valve block 1, accumulators one 9 and accumulators two 10 are symmetrically arranged on the top of the damping valve block 1, a throttle valve three 7 is connected in series between the damping valve block 1 and the accumulators one 9, and a throttle valve four 8 is connected in series between the damping valve block 1 and the accumulators two 10.

[0018] The damping valve block 1 comprises a throttle valve one 2, a throttle valve two 4, a one-way valve one 3, a one-way valve two 5 and a two-position two-way proportional solenoid valve 6, the throttle valve one 2 and the one-way valve one 3 are connected in series to form a branch oil path one, the throttle valve two 4 and the one-way valve two 5 are connected in series to form a branch oil path two, the branch oil path one and the branch oil path two are connected in parallel and connected with the two-position two-way proportional solenoid valve 6.

[0019] The surface of the damping valve block 1 is provided with a plurality of interfaces, respectively P1, P2, P3, B1, B2, one end of the left lifting oil cylinder 11 is provided with an interface Y1, one end of the right lifting oil cylinder 12 is provided with an interface Y2, one end of the accumulator one 9 is provided with an interface X1, one end of the accumulator two 10 is provided with an interface X2, the main hydraulic system 14 is connected with P1, the interface Y1 of the left lifting oil cylinder 11 is connected with P2, the interface Y2 of the right lifting oil cylinder 12 is connected with P3, the accumulator one 9 is connected with B1, the accumulator two 10 is connected with B2, both ends of the two-position two-way proportional solenoid valve 6 are respectively provided with interfaces D1 and D2, both interfaces D1 and D2 are two-way interfaces, D1 is connected with B1 and B2, D2 is connected with the one-way valve one 3 and the one-way valve two 5, both ends of the throttle valve one 2 are respectively provided with interfaces J1 and J2, both ends of the one-way valve are respectively provided with interfaces J3 and J4, both ends of the throttle valve two 4 are respectively provided with interfaces J5 and J6, both ends of the one-way valve two 5 are respectively provided with interfaces J7 and J8, both ends of the throttle valve three 7 are respectively provided with interfaces J9 and J10, both ends of the throttle valve four 8 are respectively provided with interfaces J11 and J12, the P1 port on the damping valve block 1 is connected with the lifting oil pressure sensor 13, the P1 port on the damping valve block 1 directly takes oil from the main hydraulic system 14, the P2 port on the damping valve block 1 is connected with the Y1 port on the left lifting oil cylinder 11, the J1 port on the throttle valve one 2 and the J5 port on the throttle valve two 4, the P3 port on the damping valve block 1 is directly connected with the Y2 port on the right lifting oil cylinder 12, the J1 port on the throttle valve one 2 and the J5 port on the throttle valve two 4, and is also connected with the P1 port on the damping valve block 1, the J2 port on the throttle valve one 2 is connected with the J3 port on the one-way valve one 3, the J6 port on the throttle valve two 4 is connected with the J7 port on the one-way valve two 5, the J4 ports on the one-way valve one 3 and the one-way valve two 5 are respectively connected with the D2 port on the two-position two-way proportional solenoid valve 6, the D1 port on the two-position two-way proportional solenoid valve 6 is respectively connected with the B1 and B2 ports on the damping valve block 1, the B1 and B2 ports on the damping valve block 1 are respectively connected with the J9 and J12 ports on the throttle valve three 7 and the throttle valve four 8, the J10 and J11 ports on the throttle valve three 7 and the throttle valve four 8 are respectively connected with the X1 and X2 ports on the accumulator one 9 and the accumulator two 10.

[0020] When the device is used, the following two cases are worked;

[0021] 1, the damping valve block 1 is not working state

[0022] When the heavy electric forklift is full of lifting and then descending, the two-position two-way proportional solenoid valve 6 is not working, the valve core is located at the left side of the two-position two-way proportional solenoid valve 6, from P2 to J1-J2-J3-J4-D2 and P3 to J5-J6-J7-J8-D2 cannot form a path;

[0023] 2, the damping valve block 1 working state

[0024] When the heavy electric forklift is full of load and rises and then falls, if the pressure fluctuation is large in the process of full load and bad working condition, the lifting oil way pressure sensor 13 will sense it, at this time the lifting oil way pressure sensor 13 will give a signal to the two-position two-way proportional electromagnetic valve 6, let the two-position two-way proportional electromagnetic valve 6 open, at this time the two-position two-way proportional electromagnetic valve 6 will work in the right side position passage, at this time the two-position two-way proportional electromagnetic valve 6 right side will store the fluctuating high pressure oil energy in the accumulator one 9 and the accumulator two 10 through the following passage: P2 and P3-J5-J6-J7-J8-D2-D1-B1 and B2, B1-J9-J10-X1, B2-J12-J11-X2, when the lifting oil way pressure sensor 13 detects that the load pressure is decreasing, at this time the hydraulic energy stored in the accumulator one 9 and the accumulator two 10 needs to be released, through the circuit opposite to the recovery channel just now, that is: D1-D2-J4-J2-J1, it can be seen that the check valve one 3 and the check valve two 5 are arranged reversely, one is responsible for recovery and one is responsible for release, the whole process is to control the two-position two-way proportional electromagnetic valve 6 in the real-time control system according to the pressure signal, so as to realize the real-time on-off of the accumulator one 9, the accumulator two 10 and the lifting hydraulic system; The purpose of setting two accumulators in the system is: one is to achieve the energy recovery and release required by the system, at the same time, it can reduce the volume of a single accumulator, which is convenient for arranging on the compact lifting system without affecting the field of vision; In addition, even if one accumulator fails, this system can still relieve the vibration and impact of the falling hydraulic system.

Claims

1. A heavy electric forklift truck lowering damping oil circuit system comprising a main hydraulic system and a damping valve block, characterized in that: The main hydraulic system is connected with the damping valve block, a lifting oil way pressure sensor is fixedly installed at the connection position of the main hydraulic system and the damping valve block, left and right lifting oil cylinders are symmetrically arranged at the two sides of the damping valve block, accumulators one and two are symmetrically arranged at the top of the damping valve block, a throttle valve three is connected in series between the damping valve block and the accumulator one, and a throttle valve four is connected in series between the damping valve block and the accumulator two. The damping valve block comprises a throttle valve one, a throttle valve two, a one-way valve one, a one-way valve two and a two-position two-way proportional electromagnetic valve, the throttle valve one and the one-way valve one are connected in series to form a branch oil way one, the throttle valve two and the one-way valve two are connected in series to form a branch oil way two, and the branch oil way one and the branch oil way two are connected in parallel and connected with the two-position two-way proportional electromagnetic valve.

2. The heavy electric forklift descent damping oil passage system according to claim 1, characterized by: The surface of the damping valve block is provided with a plurality of interfaces, namely P1, P2, P3, B1 and B2, one end of the left lifting oil cylinder is provided with an interface Y1, one end of the right lifting oil cylinder is provided with an interface Y2, one end of the accumulator one is provided with an interface X1, and one end of the accumulator two is provided with an interface X2.

3. The heavy electric forklift descent damping oil passage system according to claim 2, characterized by: The main hydraulic system is connected with P1, the interface Y1 of the left lifting oil cylinder is connected with P2, the interface Y2 of the right lifting oil cylinder is connected with P3, the accumulator one is connected with B1, and the accumulator two is connected with B2.

4. The heavy electric forklift descent damping oil passage system according to claim 2, characterized by: The two ends of the two-position two-way proportional electromagnetic valve are respectively provided with interfaces D1 and D2, the interfaces D1 and D2 are both two-way interfaces, D1 is connected with B1 and B2, and D2 is connected with the one-way valve one and the one-way valve two.

5. The heavy electric motorized forklift descent damping oil passage system according to claim 1, characterized by: The two ends of the throttle valve one are respectively provided with interfaces J1 and J2, the two ends of the one-way valve are respectively provided with interfaces J3 and J4, the two ends of the throttle valve two are respectively provided with interfaces J5 and J6, the two ends of the one-way valve two are respectively provided with interfaces J7 and J8, the two ends of the throttle valve three are respectively provided with interfaces J9 and J10, and the two ends of the throttle valve four are respectively provided with interfaces J11 and J12.

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