Hydraulic machine sliding block micro-speed control system

Abstract

A hydraulic machine sliding block micro-speed control system comprises a main pump set, an outlet of a plunger pump of the main pump set is connected with an oil inlet of a cartridge valve set, an oil outlet of the cartridge valve set is connected with a self-weight fast lower cartridge valve set, and an oil outlet A of the self-weight fast lower cartridge valve set is connected with a rodless cavity of a main oil cylinder. An oil outlet B of the valve group inserted below the self-weight block is connected with a rod cavity of the main oil cylinder; the hydraulic system further comprises a liquid filling control branch connected with a rodless cavity of the main oil cylinder, the liquid filling control branch comprises a liquid filling control box, and the liquid filling control box is connected with a liquid filling valve which is communicated with the rodless cavity of the main oil cylinder in a one-way mode through an oil way. The oil inlet of the prefill valve is also connected with a prefill valve control oil way; the prefill valve control oil circuit is connected with the prefill valve control valve group; and the prefill valve control valve group is connected with the prefill pump. According to the structure, a small-displacement pump set does not need to be additionally arranged to achieve the micro-speed pressing action of the sliding block, then the equipment cost is reduced, more importantly, the structure of a hydraulic system is simplified, the equipment failure rate is reduced, and the equipment can work more stably.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic press control machinery, and particularly relates to a hydraulic press slider micro-speed control system. Background Art

[0002] The existing servo motor drives the Rexroth A15VSO175 plunger pump, which is composed of a pump group. The rated input speed of the plunger pump is 400-1800rad / min, so the conventional displacement of this type of pump group is 70-315L / min. However, for a small press, the displacement of 70L / min cannot meet the micro-speed movement of the slider in some pressing processes, so another small displacement pump group (output flow 15L / min) is required to achieve the micro-speed (slider speed is generally not more than 10mm / s) pressing action of the slider, see Figure 1 . Utility Model Content

[0003] In order to save a small pump group for driving a slider to move at a slow speed so as to reduce the equipment cost, the utility model proposes a hydraulic press slider slow speed control system.

[0004] The utility model is achieved in this way:

[0005] A hydraulic press slider micro-speed control system, including a main pump group, the main pump group includes at least one servo motor and a plunger pump connected to the servo motor; the outlet of the plunger pump is connected to the oil inlet of the cartridge valve group, the oil outlet of the cartridge valve group is connected to the deadweight fast-down cartridge valve group, the oil outlet A of the deadweight fast-down cartridge valve group is connected to the rodless chamber of the main oil cylinder, and the oil outlet B of the deadweight fast-down cartridge valve group is connected to the rod chamber of the main oil cylinder; it is characterized in that: it also includes a filling control branch connected to the rodless chamber of the main oil cylinder, the filling control branch includes a filling control box, the filling control box is connected to the one-way filling valve of the rodless chamber of the main oil cylinder through an oil circuit; the oil inlet of the filling valve is also connected to the filling valve control oil circuit; the filling valve control oil circuit is connected to the filling valve control valve group, which is used to control the opening and closing of the filling valve; the filling valve control valve group is connected to the filling pump; the filling pump is used to supply oil to the filling valve control valve group.

[0006] Preferably, the filling valve control valve group includes a filling control valve for controlling the opening and closing of the filling valve; a plunger pump external control valve for controlling the variables of the plunger pump; and an empty circulation control valve for empty circulation of the oil when the filling control valve and the plunger pump external control valve are not in use to avoid an increase in the oil temperature; the oil inlet of the filling control valve is connected to the oil outlet of the filling pump; the oil inlet of the empty circulation control valve is connected to the oil outlet of the filling pump; the oil inlet of the plunger pump external control valve is connected to the oil outlet of the filling pump; the oil outlet of the filling control valve is connected to the filling valve control oil circuit; the oil outlet of the empty circulation control valve is connected to the oil return from the oil tank; the oil outlet of the plunger pump external control valve is connected to the external control oil port of the plunger pump oil pump.

[0007] Preferably, the filling control valve is a two-position four-way valve.

[0008] Preferably, the plunger pump external control valve is a two-position four-way valve.

[0009] Preferably, the dry circulation control valve is an electromagnetic unloading valve.

[0010] The utility model has the advantages and technical effects: when the slider of the press needs to move at a slow speed, the A15VSO175 plunger pump is driven by external control oil to reduce the output variable, and the flow output range of the pump group can be expanded in combination with the speed control of the servo motor. Therefore, there is no need to equip another small displacement pump group to achieve the slider's slow pressing action, thereby reducing equipment costs, and more importantly, simplifying the structure of the hydraulic system, reducing the equipment failure rate, and making the equipment work more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the hydraulic principle circuit without external connection to the H5 port of the A15VSO175 plunger pump;

[0012] Figure 2 It is a hydraulic principle circuit connected to the H5 port of the A15VSO175 plunger pump;

[0013] Figure 3 This is the hydraulic principle diagram of the plunger pump of this application

[0014] Figure 4 This is the displacement control curve of the A15VSO175 plunger pump with a stroke controller. In the figure, 10, main pump group; 101, plunger pump; 102, servo motor; 20, cartridge valve group; 30, deadweight fast-down cartridge valve group; 401, rodless chamber; 402, rod chamber; 501, filling control box; 502, filling valve; 503, filling valve control oil circuit; 504, filling valve control valve group; 514, filling control valve; 524, dry cycle control valve; 534, plunger pump external control valve; 505, filling pump. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0016] See also Figures 2 to 4A hydraulic press slider micro-speed control system includes a main pump group 10, the main pump group includes at least one servo motor 102 and a plunger pump 101 connected to the servo motor. In this embodiment, two groups of plunger pumps are selected. The plunger pump preferably adopts a plunger pump with an H5 stroke controller, and its model is A15VSO175 plunger pump. The plunger pump has an external oil pump control port; the oil outlet of the plunger pump is connected to the oil inlet of the cartridge valve group 20, and the cartridge valve group 20 is used to control the oil supply of the main pump group to the deadweight fast-down cartridge valve group 30 or to draught back to the main oil tank; the outlet of the cartridge valve group The oil port is connected to the self-weighted fast-down plug-in valve group 30, and the self-weighted fast-down plug-in valve group is used to control the oil flow to the rodless chamber or the rod chamber of the oil cylinder; the oil outlet A of the self-weighted fast-down plug-in valve group is connected to the rodless chamber 401 of the master cylinder, and the oil outlet B of the self-weighted fast-down plug-in valve group is connected to the rod chamber 402 of the master cylinder; it also includes a filling control branch connected to the rodless chamber of the master cylinder, and the filling control branch includes a filling control box 501, and the filling control box is connected to the filling valve 502 that is unidirectionally connected to the rodless chamber of the master cylinder through an oil circuit; the oil inlet of the filling valve is also connected to the filling valve control oil circuit 503;

[0017] The filling valve control oil circuit is connected to the filling valve control valve group 504, which is used to control the opening or closing of the filling valve 502, and is also used to control whether the main oil pump A15VSO175 plunger pump 101 is variable;

[0018] The filling valve control valve group is connected to the filling pump 505; the filling pump is used to supply oil to the filling valve control valve group 504.

[0019] Preferably, the above technical solution comprises: the filling valve control valve group 504 comprises a filling control valve 514 for controlling the opening or closing of the filling valve 502; the filling control valve is a two-position four-way valve.

[0020] The plunger pump external control valve 534 is used to control whether the main oil pump A15VSO175 plunger pump is variable. The plunger pump external control valve is a two-position four-way valve.

[0021] And, the dry circulation control valve 524 is used to circulate the oil of the filling pump in dry circulation when the filling valve control valve and the plunger pump external control valve are not in use, so as to avoid the oil temperature rising; the dry circulation control valve is an electromagnetic unloading valve.

[0022] The oil inlet of the filling control valve is connected to the oil outlet of the filling pump;

[0023] The oil inlet of the dry circulation control valve is connected to the oil outlet of the charging pump;

[0024] The oil inlet of the plunger pump external control valve is connected to the oil outlet of the plunger pump external control valve, and the oil outlet of the filling control valve is connected to the filling valve control oil circuit;

[0025] The oil outlet of the dry circulation control valve is connected to the oil tank;

[0026] The oil outlet of the plunger pump external control valve is connected to the oil pump external control oil port of the plunger pump.

[0027] The working principle of this utility model:

[0028] When the equipment is stamping normally, the main pump group 10 supplies oil to the deadweight fast-down cartridge valve group 30 through the cartridge valve group 20. The deadweight fast-down cartridge valve group 30 controls the oil to flow to the rodless chamber of the main oil cylinder (at this time, the slider moves downward to increase pressure) or the rod chamber (at this time, the slider returns). When the slider returns, the filling pump 505 controls the filling valve 502 to open through the filling control valve 514 (at this time, the dry cycle control valve 524 is energized to cancel the dry cycle), and the oil in the rodless chamber of the oil cylinder returns to the filling control box 501 through the filling valve 502.

[0029] When the equipment slider performs a micro-speed action, the charging pump 505 controls the A15VSO175 plunger pump to change the output displacement through the plunger pump external control valve 534 (at this time, the dry cycle control valve 524 is energized to cancel the dry cycle), and the main oil pump supplies oil to the rodless chamber of the cylinder through the cartridge valve group 20 and the deadweight fast-down cartridge valve group 30, thereby driving the slider to move downward at a micro-speed of no more than 10 mm / s.

[0030] Adopt the structure of the utility model, from Figure 4 It can be seen that as the pressure of the external control oil of the plunger pump increases, the displacement of the plunger pump gradually decreases. When the external control oil pressure reaches about 45bar, the output displacement of the plunger pump drops to the minimum, which is only about 5% of the full displacement. This patent is developed by utilizing this feature of the A15VSO175 pump.

[0031] In summary, the utility model structure does not need to be equipped with a small displacement pump group to realize the micro-speed pressing action of the slider, thereby reducing the equipment cost. More importantly, it simplifies the structure of the hydraulic system, reduces the equipment failure rate and makes the equipment work more stably.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydraulic press slider micro-speed control system, comprising a main pump group, the main pump group comprising at least one servo motor and a plunger pump connected to the servo motor; the outlet of the plunger pump is connected to the oil inlet of the cartridge valve group, the oil outlet of the cartridge valve group is connected to the deadweight fast-down cartridge valve group, the oil outlet A of the deadweight fast-down cartridge valve group is connected to the rodless chamber of the main oil cylinder, and the oil outlet B of the deadweight fast-down cartridge valve group is connected to the rod chamber of the main oil cylinder; characterized in that: It also includes a filling control branch connected to the rodless chamber of the main oil cylinder, the filling control branch includes a filling control box, the filling control box is connected to the one-way filling valve of the rodless chamber of the main oil cylinder through an oil circuit; the oil inlet of the filling valve is also connected to the filling valve control oil circuit; the filling valve control oil circuit is connected to the filling valve control valve group, which is used to control the opening and closing of the filling valve; the filling valve control valve group is connected to the filling pump; the filling pump is used to supply oil to the filling valve control valve group.

2. The hydraulic press slider micro-speed control system according to claim 1 is characterized in that: The filling valve control valve group includes a filling control valve, which is used to control the opening and closing of the filling valve; The plunger pump external control valve is used to control the variable of the plunger pump; and the dry circulation control valve is used to circulate the oil dry when the filling control valve and the plunger pump external control valve are not used to avoid the oil temperature rising; The oil inlet of the filling control valve is connected to the oil outlet of the filling pump; The oil inlet of the dry circulation control valve is connected to the oil outlet of the charging pump; The oil inlet of the external control valve of the plunger pump is connected to the oil outlet of the charging pump; The oil outlet of the filling control valve is connected to the filling valve control oil circuit; The oil outlet of the dry circulation control valve is connected to the oil return of the oil tank; The oil outlet of the plunger pump external control valve is connected to the plunger pump oil pump external control oil port.

3. The hydraulic press slider micro-speed control system according to claim 2 is characterized in that: The filling control valve is a two-position four-way valve.

4. The hydraulic press slide micro-speed control system according to claim 2 is characterized in that: The plunger pump external control valve is a two-position four-way valve.

5. The hydraulic press slide micro-speed control system according to claim 2 is characterized in that: The dry circulation control valve is an electromagnetic unloading valve.

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