Hydraulic forklift pump noise testing device

Abstract

The utility model relates to a hydraulic forklift pump noise testing device which comprises a sound insulation wall, a driving assembly and a hydraulic assembly are installed in the sound insulation wall, a pump body positioning seat is installed on the sound insulation wall, an oil outlet pipe and an oil inlet pipe are installed on the hydraulic assembly, and the oil outlet pipe and the oil inlet pipe extend out of the sound insulation wall. The driving assembly comprises a driving motor; an output shaft of the driving motor is connected with a transmission shaft through an elastic coupling; the input end and the output end of the oil tank are connected with one end of an oil inlet pipe and one end of an oil outlet pipe respectively. And the other ends of the oil outlet pipe and the oil inlet pipe are connected with a hydraulic forklift pump. The bearing seat is additionally arranged between the motor and the pump body positioning seat, so that the distance between the motor and the oil pump is lengthened, and the influence of environmental noise and the like generated by a transmission shaft, a coupler, especially the motor, on noise test data results is effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic pump testing and relates to a hydraulic forklift pump noise testing device. Background Art

[0002] With the rapid development of the new energy industry in non-road vehicles, electric forklifts are widely used in closed storage environments. Because of the closed environment, if fuel forklifts are used, the noise is loud, so electric forklifts are gradually replacing them. Due to the need to reduce noise, customers in the electric forklift industry have higher and higher requirements for the noise of electric forklifts. The hydraulic system of electric forklifts is one of the main noise sources, among which the hydraulic pump is the main component. The mainstream solution of major manufacturers is to directly connect the motor and the oil pump through the pump body positioning seat, and directly build a brick wall at the pump body positioning seat for sound insulation. This test method is close to the motor and the oil pump, which is easily affected by the motor noise. Especially when the oil pump is loaded, the motor noise is also large. The wall has a general effect on isolating the motor noise, and it is too simple and crude. There are no shock absorption measures, which affects the accuracy of the test results. The test data can only be used for comparison, and cannot accurately reflect the noise curve of the hydraulic pump in the hydraulic system, which is not conducive to the noise avoidance design research of the hydraulic pump. Summary of the invention

[0003] The utility model aims to provide a hydraulic forklift pump noise testing device, which can solve the above-mentioned problems and has high cost performance.

[0004] According to the technical solution provided by the utility model: a hydraulic forklift pump noise testing device includes a soundproof wall, a driving component and a hydraulic component are installed in the soundproof wall, a pump body positioning seat is installed on the soundproof wall, an oil outlet pipe and an oil inlet pipe are installed on the hydraulic component, and the oil outlet pipe and the oil inlet pipe extend out of the soundproof wall; the driving component includes a driving motor, and the output shaft of the driving motor is connected to the transmission shaft through an elastic coupling; the hydraulic component includes an oil tank, and the input end and the output end of the oil tank are respectively connected to one end of the oil inlet pipe and the oil outlet pipe; the other end of the oil outlet pipe and the oil inlet pipe are connected to the hydraulic forklift pump.

[0005] As a further improvement of the utility model, the input end of the hydraulic forklift pump is connected to the transmission shaft through a hydraulic pump coupling.

[0006] As a further improvement of the utility model, a positioning surface is provided on the outer side of the pump body positioning seat.

[0007] As a further improvement of the utility model, a bearing seat is installed on the inner side of the sound insulation wall, and the transmission shaft is rotatably installed in the bearing seat.

[0008] As a further improvement of the utility model, the sound insulation wall is provided with an avoidance hole, a part of the pump body positioning seat is located in the avoidance hole, and the pump body positioning seat is connected to the outer side of the bearing seat.

[0009] As a further improvement of the utility model, a motor base is installed at the bottom of the driving motor.

[0010] As a further improvement of the utility model, the output end of the oil tank is connected to the oil outlet pipe through a pressure regulating valve group.

[0011] As a further improvement of the utility model, the outer layer of the sound insulation wall is galvanized steel plate, with environmentally friendly sound insulation cotton and composite sound insulation board built in, and the inner surface is flame-retardant glass fiber cloth and galvanized perforated mesh.

[0012] The positive effects of this application are:

[0013] 1. The utility model adds a bearing seat between the motor and the pump body positioning seat, which lengthens the distance between the motor and the oil pump and effectively reduces the influence of the environmental noise generated by the transmission shaft, coupling and especially the motor on the noise test data results.

[0014] 2. The utility model effectively reduces the vibration, noise and radial force of the motor during operation, prolongs the service life of the motor, is cheaper than a professional anechoic chamber, and has a high cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the utility model.

[0016] Figure 2 It is a top view of the utility model.

[0017] Figure 1-Figure 2 The hydraulic forklift comprises a hydraulic forklift pump 1, a pump body positioning seat 2, a bearing seat 3, a transmission shaft 4, an elastic coupling 5, a driving motor 6, a motor base 7, a sound insulation wall 8, an oil tank 9, a hydraulic pump coupling 13 and the like. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0019] In order to enable those skilled in the art to better understand the solution of the utility model, the following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so as to describe the embodiments of the utility model described herein. In addition, similar terms such as "including" and "having" mean that in addition to those contents already listed in "including" and "having", other contents that have not been listed can also be "included" and "having"; for example, a process, method, system, product or device that can include a series of steps or units is not necessarily limited to those steps or units that have been clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] Due to the angle of the drawing, some components may not be drawn, but their positions and connection relationships can be partially understood based on the text expression.

[0022] like Figure 1-Figure 2 As shown, the utility model is a hydraulic forklift pump noise testing device, including a sound insulation wall 8, a drive assembly and a hydraulic assembly are installed in the sound insulation wall 8, a pump body positioning seat 2 is installed on the sound insulation wall 8, an oil outlet pipe 11 and an oil inlet pipe 12 are installed on the hydraulic assembly, and the oil outlet pipe 11 and the oil inlet pipe 12 extend out of the sound insulation wall 8.

[0023] The driving assembly includes a driving motor 6, and the output shaft of the driving motor 6 is connected to the transmission shaft 4 through an elastic coupling 5. The driving motor 6 is used to provide a power source, and the elastic coupling 5 is used to reduce vibration generated during high-speed rotation.

[0024] The pump body positioning seat 2 is used to maintain the concentricity of the hydraulic forklift pump 1 and the drive motor 6, avoiding the need for center calibration every time installation, saving installation time. A positioning surface is provided on the outer side of the pump body positioning seat 2 for positioning and installing the hydraulic forklift pump 1. The input end of the hydraulic forklift pump 1 is connected to the transmission shaft 4 through the hydraulic pump coupling 13.

[0025] In order to improve the rigidity and rotation accuracy of the transmission shaft 4 , a bearing seat 3 is installed inside the sound insulation wall 8 , and the transmission shaft 4 is rotatably installed in the bearing seat 3 .

[0026] The sound insulation wall 8 is provided with an avoidance hole, a part of the pump body positioning seat 2 is located in the avoidance hole, and the pump body positioning seat 2 is connected to the outer side of the bearing seat 3 .

[0027] In order to reduce the vibration of the driving motor 6 , a motor base 7 is installed at the bottom of the driving motor 6 .

[0028] The hydraulic assembly includes an oil tank 9, the input end and the output end of the oil tank 9 are respectively connected to an oil inlet pipe 12 and one end of an oil outlet pipe 11. The other ends of the oil outlet pipe 11 and the oil inlet pipe 12 are connected to a hydraulic forklift pump 1.

[0029] In order to improve the controllability of the test, the output end of the oil tank 9 is connected to the oil outlet pipe 11 through the pressure regulating valve group 10.

[0030] The outer layer of the soundproof wall 8 is galvanized steel plate, with built-in environmentally friendly sound insulation cotton and composite sound insulation board. The inner surface is flame-retardant glass fiber cloth and galvanized perforated mesh plate, which are used for sound absorption and sound insulation.

[0031] Working principle: This is a hydraulic forklift pump noise test device. The hydraulic forklift pump 1 draws oil from the oil tank 9, and the oil returns to the oil tank after the pressure is adjusted by the pressure regulating valve group. It is necessary to test the oil pump at different driving speeds and adjust different outlet pressures through the pressure regulating valve group to achieve noise testing of the forklift pump at various speeds and pressures. The oil temperature, speed and pressure values ​​required for the test process are set by the host computer. The drive motor provides the power source and the oil tank provides hydraulic oil as the fluid medium. NVH gravity acceleration sensors and microphones are arranged around the hydraulic pump to be tested for data collection.

[0032] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A hydraulic forklift pump noise testing device, comprising a sound insulation wall (8), characterized in that: A drive assembly and a hydraulic assembly are installed in the soundproof wall (8); a pump body positioning seat (2) is installed on the soundproof wall (8); an oil outlet pipe (11) and an oil inlet pipe (12) are installed on the hydraulic assembly; the oil outlet pipe (11) and the oil inlet pipe (12) extend out of the soundproof wall (8); the drive assembly comprises a drive motor (6); an output shaft of the drive motor (6) is connected to a transmission shaft (4) via an elastic coupling (5); the hydraulic assembly comprises an oil tank (9); an input end and an output end of the oil tank (9) are respectively connected to one end of the oil inlet pipe (12) and the oil outlet pipe (11); and the other ends of the oil outlet pipe (11) and the oil inlet pipe (12) are connected to a hydraulic forklift pump (1).

2. The hydraulic forklift pump noise testing device according to claim 1, characterized in that: The input end of the hydraulic forklift pump (1) is connected to the transmission shaft (4) via a hydraulic pump coupling (13).

3. The hydraulic forklift pump noise testing device according to claim 1, characterized in that: A positioning surface is provided on the outer side of the pump body positioning seat (2).

4. The hydraulic forklift pump noise testing device according to claim 1, characterized in that: A bearing seat (3) is installed on the inner side of the sound insulation wall (8), and a transmission shaft (4) is rotatably installed in the bearing seat (3).

5. The hydraulic forklift pump noise testing device according to claim 1, characterized in that: The sound insulation wall (8) is provided with an avoidance hole, a portion of the pump body positioning seat (2) is located in the avoidance hole, and the pump body positioning seat (2) is connected to the outer side of the bearing seat (3).

6. The hydraulic forklift pump noise testing device according to claim 1, characterized in that: A motor base (7) is installed at the bottom of the driving motor (6).

7. The hydraulic forklift pump noise testing device according to claim 1, characterized in that: The output end of the oil tank (9) is connected to the oil outlet pipe (11) via a pressure regulating valve group (10).

8. The hydraulic forklift pump noise testing device according to claim 7, characterized in that: The outer layer of the sound insulation wall (8) is galvanized steel plate, with environmentally friendly sound insulation cotton and composite sound insulation board inside, and the inner surface is flame-retardant glass fiber cloth and galvanized perforated mesh.

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