CN204041378U - Adopt the crank-connecting rod transmission type hydraulic press pump of linear electric motor - Google Patents

Abstract

The utility model discloses a crank connecting rod transmission type hydraulic pump adopting a linear motor, which comprises at least one plunger, and the plunger is movably arranged in a cavity, and is characterized in that it also includes a linear motor, the The motor secondary of the linear motor is provided with at least one rack, and at least one gear meshes with the rack; the plunger is connected at the eccentric position of the gear through a hinge rod, and the hinge rod is connected to the gear and The plungers are all hinged. The crank-link transmission hydraulic pump adopting the linear motor of the utility model makes full use of the crank-link mechanism when the transmission angle and the pressure angle are large, and it is a stroke amplification mechanism. At this time, the hydraulic pump can output low-pressure and large-flow liquid; When the pressure angle and pressure angle are small, the crank-link mechanism is a force amplification mechanism. At this time, the hydraulic pump can output high-pressure and small-flow liquid.

Description

Crank connecting rod hydraulic pump with linear motor

technical field

The utility model belongs to the mechanical field, and relates to a crank connecting rod transmission type hydraulic pump adopting a linear motor, in particular to a plunger type hydraulic pump used in a hydraulic elevator drive system.

Background technique

At present, the throttling speed regulating system hydraulic speed regulating technology widely used in the industrial field mainly includes the throttling speed regulating system composed of a constant pump and a throttle valve and the pump speed regulating system driven by a variable pump. High-power hydraulic pumps with continuously adjustable flow and pressure are mainly swash plate axial piston pumps, but the structure of the swash plate axial piston pump is extremely complicated, especially the plunger has to withstand the radial force formed Torque, which makes its friction conditions deteriorate, service life and mechanical efficiency are reduced. In addition, the sliding shoe connected to the lower end of the plunger has a complex structure, extremely harsh friction conditions, and a complicated flow distribution system, etc., making the manufacturing process of the plunger pump extremely complicated. The traditional swash plate axial piston pump also has a fatal flaw that cannot be ignored, that is, the flow rate is unstable, resulting in the so-called pulsation rate. To reduce the flow rate pulsation rate, not only the number of plungers needs to be increased, but also the The number is a prime number, such as 3, 5, 7, 11, 13, 17, 19, 23 and so on. Therefore, an excessive number of plungers is actually a helpless choice, which not only makes the mechanism complicated, but also keeps the manufacturing cost high. At present, the throttling speed control system widely used in the industrial field has extremely low energy utilization rate and is only suitable for small power transmission occasions. In the occasions that require high power and continuous speed regulation, the pump speed control system driven by variable pump is often used . The high-power hydraulic pumps with continuously adjustable flow and pressure are mainly swash plate axial piston pumps. In the past, high-quality swash plate axial piston pumps mainly relied on imports, mainly German Rexroth and Japanese Kawasaki companies. products are extremely expensive. Taking the swash plate axial piston pump of common specifications for construction machinery as an example, the price of a single unit is generally more than 30,000 yuan. Recently, Shandong Zhongchuan Hydraulic has successfully produced high-quality hydraulic pumps that can replace imported ones, and the price of a single unit is about 20,000 yuan. Such high prices have put great pressure on downstream industries.

The Chinese patent with the authorized notification number CN 102207066 B also discloses a double-acting plunger pump driven by a symmetrical toggle lever, but this double-acting plunger pump only shows the last stage of mechanical transmission. With the drive motor, it will be found that the overall layout of the double-acting plunger pump is extremely asymmetrical. In addition, the toggle mechanism in the double-acting plunger pump is hinged on the eccentric pin shaft on the end face of the gear. The pin shaft is a cantilever beam, and the stress condition is extremely poor.

Linear motor is one of the new types of motors researched and developed in recent years. It is a power device that directly converts electrical energy into linear motion. Linear motors have many outstanding advantages, such as good starting performance, convenient maintenance, simple structure, etc. In some occasions, linear motors have their unique applications and cannot be replaced by rotary motors. Linear motors are especially suitable for occasions that require frequent reciprocating motion, appropriate thrust, appropriate motion speed, and appropriate positioning accuracy.

Contents of the invention

In order to solve the above-mentioned problems, the utility model provides a crank-connecting rod driven hydraulic pump with a linear motor, which has a simple structure, low cost, and can continuously adjust flow and pressure.

The technical solution of the utility model is to provide a crank-connecting rod transmission hydraulic pump adopting a linear motor, which includes two plungers, and the plunger is movably arranged in a cavity, and is characterized in that it also includes a linear motor, The motor secondary of the linear motor is provided with two racks; with the motor secondary as the axis of symmetry, two gears are symmetrically arranged on both sides of the motor secondary, and the two gears are respectively connected to one of the racks. meshing; the plungers are connected at an eccentric position of the gear through a hinge rod, and the hinge rod is hinged with the gear and the plunger.

Preferably, the ends of the cavity are provided with an oil inlet and an oil discharge; the oil inlet communicates with the oil tank through a one-way valve, and the oil discharge connects with an external hydraulic system through a one-way valve.

Preferably, the outlet of the one-way valve of the oil discharge circuit communicates with the pressure regulator, and the outlet of the pressure regulator leads to the hydraulic actuator system.

Preferably, a digital pressure switch is connected to the voltage regulator.

Preferably, the movers of the two servo linear motors are controlled by a two-axis linkage numerical control system.

The crank connecting rod driven hydraulic pump adopting the linear motor of the utility model has the following advantages:

1) The geometry of each basic structure in the mechanism is relatively simple, and it is convenient to manufacture.

2) Driven by a linear motor, there is no need for additional devices that convert rotary motion into linear motion. Compared with devices driven by ordinary AC motors, the weight and volume of the entire system are reduced, while the noise is low, the efficiency is high, and it does not pollute the environment. , is a green device.

3) The use of linear motors has greatly improved the automation and equipment of the device, and the work performance has been greatly improved, which is the development direction of the new generation of equipment.

4) The crank-link mechanism in this device is a nonlinear mechanism. When the transmission angle and pressure angle are large, the crank-link mechanism is a stroke amplification mechanism. At this time, the hydraulic pump can output low-pressure and large-flow liquid; When the angle is small, the crank-link mechanism is a force amplification mechanism. At this time, the hydraulic pump can output high-pressure and small-flow liquid.

5) The dual-station structure is adopted, and the force is balanced, which can effectively prolong the life of the structure. .

Description of drawings

Fig. 1 is a structural schematic view of the best embodiment of the crank-connecting rod transmission hydraulic pump using a linear motor in the present invention.

Detailed ways

The specific implementation manner of the present utility model is described in further detail below.

As shown in FIG. 1 , the crank-connecting rod driven hydraulic pump adopting linear motors of the present invention includes two linear motors 10 , and the linear motors 10 include a rod-shaped motor secondary 12 and a motor primary 14 . A double-sided rack 16 is fixedly connected to the motor secondary 12 (or a double-sided rack 16 is directly processed on the motor secondary 12), and a gear 18 and a gear 18' meshed with the rack 16 are arranged on both sides. Of course, those of ordinary skill in the art can easily think of a rack 16 fixedly connected on the motor secondary 12 according to the thinking of the present invention, and several gears 18 and gears 18 ' are arranged on the same side of the rack 16; Two separate racks 16 are arranged on both sides of the stage 12, and a plurality of gears 18 and gears 18' are arranged along the direction of the racks 16, so as to realize the function of a hydraulic pump. '

A left plunger 20 and a right plunger 20' are arranged on both sides of the motor secondary 12 respectively. The left plunger 20 and the right plunger 20' are fitly placed in their respective cavities; There is an oil inlet and outlet passage (not shown); the oil inlet passage (not shown) communicates with the fuel tank (not shown) through a one-way valve (not shown), and the oil outlet passage (not shown) passes through a one-way valve Interface with external hydraulic system (not shown). The outlet of the one-way valve (not shown) in the oil discharge circuit communicates with the voltage regulator (not shown), and the outlet of the voltage regulator leads to the hydraulic actuator system (not shown); a digital pressure switch is connected to the voltage regulator (not shown). The oil inlet and outlet, one-way valve, oil tank, voltage stabilizer, digital pressure switch and hydraulic actuator system are well-known and widely used structures in the industry, and are not the innovation points of the utility model.

The left plunger 20 and the right plunger 20' are hinged on the gear 18 and the gear 18' and the eccentric position of the gear 18 and the gear 18' through the hinge rod 22 and the hinge rod 22'.

The linear motor 10 drives the motor secondary 12 to move up or down, so that the rack 16 fixed on the motor secondary 12 also moves symmetrically.

When the rack 16 moves downward, it will drive the gears 18 and 18' on both sides and the gears 18 and 18' to move clockwise and counterclockwise respectively, and drive the crank connecting rod 22 and hinge rod 22' mechanism on both sides to drive The left plunger 20 and the right plunger 20' move symmetrically to the inside at the same time. At this time, the volumes of the left and right chambers expand to form a negative pressure, and the hydraulic oil in the oil tank opens the lower one-way valve under the action of atmospheric pressure. The valves respectively enter the cavities of the left plunger 20 and the right plunger 20'.

When the rack 16 moves upward, it will drive the gears 18 and 18' on both sides and the gears 18 and 18' to move counterclockwise and clockwise respectively, and drive the crank connecting rod 22 and hinge rod 22' mechanism on both sides to drive the left column The plug 20 and the right plunger 20' move symmetrically inwardly at the same time. At this time, the volume of the cavity corresponding to the left plunger 20 and the right plunger 20' shrinks, forming pressure on the oil, so that the lower check valve leading to the oil tank is closed, and the upper check valve is opened at the same time to realize the pressure oil output. .

The above embodiment is only one implementation mode of the present utility model, and its description is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (5)

1. adopt a crank-connecting rod transmission type hydraulic press pump for linear electric motor, it comprises two plungers, and described plunger is movably set in a cavity volume, it is characterized in that: also comprise linear electric motor, the motor secondary of described linear electric motor is provided with two tooth bars; With described motor secondary for symmetry axis, arrange two gears in the bilateral symmetry of described motor secondary, gear described in two engages with tooth bar described in respectively; Described plunger is all connected to gear eccentricity position described in by a toggle, described toggle and described gear and plunger all hinged.

2. the crank-connecting rod transmission type hydraulic press pump of employing linear electric motor according to claim 1, is characterized in that: the end of described cavity volume is equipped with in-line and oil extraction road; Described in-line is communicated with fuel tank by one-way valve, and described oil extraction road is connected with external hydraulic system by one-way valve.

3. the crank-connecting rod transmission type hydraulic press pump of employing linear electric motor according to claim 2, is characterized in that: the outlet of the one-way valve on described oil extraction road communicates with voltage stabilizer, and hydraulic executing system is led in the outlet of voltage stabilizer.

4. the crank-connecting rod transmission type hydraulic press pump of employing linear electric motor according to claim 3, is characterized in that: described voltage stabilizer is connected to digital pressure switch.

5. the crank-connecting rod transmission type hydraulic press pump of employing linear electric motor according to claim 4, is characterized in that: the mover of linear electric motor described in two is controlled by two-axle interlocking numerical control system.