CN203050723U - Variable frequency driving shield thrust hydraulic system - Google Patents

Abstract

The utility model discloses a frequency conversion driven shield machine propulsion hydraulic system. It includes oil tank, filter, frequency converter, variable frequency motor, n quantitative pumps, n check valves, safety valves, and n propulsion partitions with the same structure; each partition is independently supplied by its own quantitative pump, all Quantitative pumps for oil supply are coaxially connected together and driven by the same variable frequency motor. Each propulsion partition includes a proportional overflow valve and i identical propulsion cylinder hydraulic system branches, the hydraulic system branch includes a three-position four-way electromagnetic reversing valve, a two-position two-way electromagnetic reversing valve, a safety valve, 2 an executive check valve and a push cylinder. In the work of the utility model, the speed of the variable frequency motor is adjusted to control the propulsion speed of the shield to avoid the valve control loss of the speed regulating valve, and the variable speed control has a better energy-saving effect than the variable displacement control; different propulsion zones use different Quantitative pump oil supply can solve the flow coupling problem caused by different partitions sharing the same oil source.

Description

A variable frequency drive shield propulsion hydraulic system

technical field

The utility model relates to a shield propulsion hydraulic system, in particular to an energy-saving shield propulsion hydraulic system based on variable frequency drive cascade quantitative pumps.

Background technique

The shield propulsion hydraulic system is one of the key subsystems of the shield tunneling equipment. It undertakes the jacking task of the shield machine. Set track. The existing shield propulsion system can be divided into variable pump + speed control valve + overflow valve mode and variable pump + pressure reducing valve mode according to the control mode of the propulsion cylinder. Both of these modes realize the propulsion of the shield by controlling the propulsion pressure and correction tasks. However, the variable variable pump + speed control valve + relief valve mode has the characteristics of oil source overflow loss, the variable variable pump + pressure reducing valve mode has the characteristics of large flow coupling between propulsion cylinders in different groups, and both control modes use variable The pumps empty the oil source, so they all have the characteristics of low energy efficiency.

Contents of the invention

In order to overcome the deficiencies of low energy efficiency of the existing shield propulsion hydraulic system and large coupling between propulsion zones, the utility model provides a shield propulsion hydraulic system driven by frequency conversion. And the method of using different quantitative pumps to supply oil to different propulsion zones is adopted to realize no coupling between propulsion zones.

The technical scheme that the utility model solves its technical problem adopts is:

A variable frequency drive shield propulsion hydraulic system, characterized in that it includes a fuel tank, a filter, a frequency converter, a variable frequency motor, n quantitative pumps, n check valves, safety valves, and n propulsion partitions with the same structure; the variable frequency motor The input end of the variable frequency motor is connected to the frequency converter, and the output end of the frequency conversion motor is cascaded with n quantitative pumps. The oil inlets of the respective one-way valves are connected, and the other is connected with the respective propulsion partitions with the same structure. The oil outlets of n check valves are connected to the oil inlet of the safety valve, and the oil outlet of the safety valve is connected to the oil tank. . The said n numbers are all the same, and n is 3-4.

The propulsion partitions with the same structure all include a proportional overflow valve and i propulsion cylinder hydraulic system branches with the same structure, each propulsion cylinder hydraulic system branch includes a three-position four-way electromagnetic reversing valve, two two-position through the electromagnetic reversing valve, safety valve, the first executive check valve, the second executive check valve and the push cylinder; the oil outlet of the proportional overflow valve is connected to the oil tank, and the oil inlet of the proportional overflow valve is connected with the respective quantitative The oil outlet of the pump is connected to the oil inlet of the three-position four-way electromagnetic reversing valve in the hydraulic system branch of each propulsion cylinder, and the oil return port of each three-position four-way electromagnetic reversing valve is connected to the oil tank, each three-position One oil outlet of the four-way electromagnetic reversing valve is connected to the oil inlet of the respective two-position two-way electromagnetic reversing valve, and the other oil outlet is connected to the rod cavity of the respective propulsion cylinder, each two-position two-way The oil outlet of the electromagnetic reversing valve is connected to the rodless cavity of the respective propulsion cylinder, and the oil inlet of the first executive check valve and the second executive check valve of each propulsion cylinder hydraulic system branch are respectively connected to the The rodless cavity and the rod cavity of the propulsion cylinder of the system branch, the oil outlets of the two executive check valves are connected to the oil inlet of the safety valve of the hydraulic system branch, and the oil outlets of each safety valve are connected connected to the fuel tank. The i of the propulsion cylinder hydraulic system branches with the same structure is 1-15.

The beneficial effects of the utility model are:

During the propulsion process of the shield machine, the propulsion speed of the shield machine is controlled by adjusting the speed of the variable frequency motor, which avoids the valve control loss of the speed regulating valve, and the variable speed control has a better energy-saving effect than the variable displacement control, achieving high Energy efficiency: Different quantitative pumps are used to supply oil to different propulsion zones, which can solve the flow coupling problem caused by different zones sharing the same oil source.

Description of drawings

Fig. 1 is the schematic diagram of the hydraulic system of the present utility model.

In the figure: 1. Fuel tank, 2. Filter, 3. Frequency converter, 4. Frequency conversion motor, 5. Quantitative pump, 6. Check valve, 7. Safety valve, 8. Proportional relief valve, 9. Three-position four Pass electromagnetic directional valve, 10, two-position two-way electromagnetic directional valve, 11, safety valve, 12, the first executive check valve, 13, the second executive check valve, 14, propulsion cylinder.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

The utility model comprises an oil tank 1, a filter 2, a frequency converter 3, a variable frequency motor 4, n quantitative pumps 5, n one-way valves 6, a safety valve 7, and n propulsion partitions with the same structure; the input end of the variable frequency motor 4 Connected with the frequency converter 3, the output end of the variable frequency motor 4 is cascaded with n quantitative pumps 5, the oil inlets of the n quantitative pumps 5 are connected to the oil tank 1 through the filter 2, and the oil outlets of the n quantitative pumps 5 are respectively divided into two One way is connected to the oil inlet of the respective one-way valve 6, and the other is connected to the respective propulsion partitions with the same structure, and the oil outlets of the n oil supply check valves 6 are connected to the oil inlet of the safety valve 7 , the oil outlet of the safety valve 7 is connected to the oil tank 1. The said n numbers are all the same, and n is 3-4.

The propulsion sub-regions with the same structure all include a proportional overflow valve 8 and i propulsion cylinder hydraulic system branches with the same structure, and each propulsion cylinder hydraulic system branch includes a three-position four-way electromagnetic reversing valve 9, two Two-position electromagnetic reversing valve 10, safety valve 11, first executive check valve 12, second executive check valve 13 and propulsion cylinder 14; the oil outlet of proportional overflow valve 8 is connected to oil tank 1, proportional overflow valve The oil inlets of 8 are respectively connected with the oil outlets of the respective quantitative pumps 5 and the oil inlets of the three-position four-way electromagnetic reversing valves 9 in the hydraulic system branches of the respective propulsion cylinders, and each three-position four-way electromagnetic reversing The oil return port of the valve 9 is connected to the oil tank 1, and one oil outlet of each three-position four-way electromagnetic reversing valve 9 is connected with the oil inlet of the respective two-position two-way electromagnetic reversing valve 10, and the other oil outlet is connected with the The rod chambers of the respective propulsion cylinders 14 are connected, and the oil outlets of each two-position two-way electromagnetic reversing valve 10 are connected with the rodless chambers of the respective propulsion cylinders 14, and the first execution of the hydraulic system branch of each propulsion cylinder The oil inlets of the one-way valve 12 and the second executive one-way valve 13 are respectively connected to the rodless chamber and the rod chamber of the propulsion cylinder 14 of the hydraulic system branch, and the oil outlets of the two executive one-way valves are connected to The oil inlet of the safety valve 11 of the hydraulic system branch where it is located is connected to the oil tank 1 after the oil outlet of each safety valve 11 is connected. The i of the propulsion cylinder hydraulic system branches with the same structure is 1-15.

The working principle of the utility model is as follows:

The motor drives n quantitative pumps 5 to rotate, and the oil suction port of each quantitative pump 5 absorbs oil from the oil tank 1 through the filter 2, and the pressure oil output by each quantitative pump 5 enters the oil inlet of the respective one-way valve 6 and the respective propulsion partitions . By adjusting the speed of the variable frequency motor, the control of the maximum propulsion speed of the shield machine and the adjustment of the rewind speed of the propulsion cylinder can be realized.

During the shield propulsion process, each propulsion partition with the same structure has the same working principle: the pressure oil enters the oil inlet of the proportional relief valve 8 and the oil inlet of each three-position four-way electromagnetic reversing valve 9, each The right position of the three-position four-way electromagnetic reversing valve 9 is energized, and provides pressure oil to the oil inlet of the respective two-position two-way electromagnetic reversing valve 10 through the oil outlet 9A, and each two-position two-way electromagnetic reversing valve 10 is energized and supplies oil to the rodless chamber of the respective propulsion cylinder 14 and the oil inlet of the respective first executive check valve 12, and each propulsion cylinder 14 is pushed forward under the action of the hydraulic oil and will push the rod chamber The side hydraulic oil is sent to the oil inlet port of the second executive check valve 13 and the oil outlet port 9B of the respective three-position four-way electromagnetic reversing valve 9, and each three-position four-way electromagnetic reversing valve 9 passes through the oil return port. The port returns oil to tank 1. Through the adjustment of each proportional relief valve 8, the control of the system pressure of each propulsion zone can be realized.

During the fast rewinding process of the shield propulsion cylinder, each propulsion zone containing the propulsion cylinder that needs to be retracted has the same working principle: the pressure oil enters the oil inlet of the proportional relief valve 8 and each three-position four-way electromagnetic reversing valve 9, the left position of the three-position four-way electromagnetic reversing valve 9 of each push cylinder that needs to be retracted is energized, and through the 9B oil outlet to the rod chamber of the respective push cylinder 14 and the respective second Oil is supplied to the oil inlet of the check valve 13, and each propulsion cylinder 14 that needs to be retracted is retracted under the action of the hydraulic oil and the hydraulic oil on the side of the rodless chamber is delivered to the inlet of the respective first executive check valve 12. The oil port and the oil outlet of the respective two-position two-way electromagnetic reversing valve 10, the two-position two-way electromagnetic reversing valve 10 of each push cylinder that needs to be retracted is energized, and the hydraulic oil is delivered to the The 9A oil outlets of the respective three-position four-way electromagnetic reversing valves 9, and the three-position four-way electromagnetic reversing valves 9 of each push cylinder that needs to be retracted return oil to the fuel tank 1 through the oil return port; each does not need to return The left and right positions of the three-position four-way electromagnetic reversing valve 9 of the advancing cylinder that retreats all must not be electrified, and its respective two-position two-way electromagnetic reversing valve 10 all must not be electrified. Through the adjustment of each proportional relief valve 8, the control of the system pressure of each propulsion zone can be realized.

During the fast rewinding process of the shield propulsion cylinder, each propulsion zone that does not contain the propulsion cylinder that needs to be retracted has the same working principle: the pressure oil enters the oil inlet of the proportional relief valve 8 and each three-position four-way electromagnetic commutation At the oil inlet of valve 9, the left and right positions of each three-position four-way electromagnetic reversing valve 9 are de-energized, and their respective two-position two-way electromagnetic reversing valves 10 are de-energized. The set pressure of proportional relief valve 8 is zero, the proportional relief valve 8 returns oil to the oil tank 1 through the oil return port.

Claims (4)

1. A variable frequency drive shield propulsion hydraulic system, characterized in that it includes a fuel tank (1), a filter (2), a frequency converter (3), a frequency conversion motor (4), n quantitative pumps (5), n Check valve (6), safety valve (7), n propulsion partitions with the same structure; the input end of the variable frequency motor (4) is connected to the frequency converter (3), and the output end of the variable frequency motor (4) is connected to n quantitative pumps (5) Cascading, the oil inlets of n quantitative pumps (5) are connected to the oil tank (1) through the filter (2), and the oil outlets of n quantitative pumps (5) are divided into two paths, one path is connected to the respective single The oil inlet of one-way valve (6) is connected, and the other is connected with the propulsion partitions with the same structure. The oil outlets of n check valves (6) are connected to the oil inlet of safety valve (7), and the safety valve The oil outlet of (7) is connected to the oil tank (1). 2. A variable frequency drive shield propulsion hydraulic system according to claim 1, characterized in that: said propulsion partitions with the same structure all include proportional overflow valves (8) and i propulsion cylinder hydraulic pressure valves with the same structure System branch, each propulsion cylinder hydraulic system branch includes a three-position four-way electromagnetic reversing valve (9), a two-position two-way electromagnetic reversing valve (10), a safety valve (11), a first executive check valve (12), the second executive check valve (13) and the propulsion cylinder (14); the oil outlet of the proportional relief valve (8) is connected to the oil tank (1), and the oil inlet of the proportional relief valve (8) is respectively connected to The oil outlets of the respective quantitative pumps (5) are connected to the oil inlets of the three-position four-way electromagnetic reversing valves (9) in the hydraulic system branches of the respective propulsion cylinders, and each three-position four-way electromagnetic reversing valve (9) ) to the oil tank (1), one oil outlet of each three-position four-way electromagnetic directional valve (9) is connected to the oil inlet of the respective two-position two-way electromagnetic directional valve (10), and the other One oil outlet is connected with the rod chamber of the respective propulsion cylinder (14), and the oil outlet of each two-position two-way electromagnetic reversing valve (10) is connected with the rodless chamber of the respective propulsion cylinder (14). The oil inlets of the first executive check valve (12) and the second executive check valve (13) of the hydraulic system branch of each propulsion cylinder are respectively connected to the rodless cavity and the propulsion cylinder (14) of the hydraulic system branch where they are located. There is a rod chamber, the oil outlets of the two executive check valves are connected to the oil inlet of the safety valve (11) of the hydraulic system branch, and the oil outlets of each safety valve (11) are connected to the oil tank ( 1). 3. A variable frequency drive shield tunneling hydraulic system according to claim 1, characterized in that: said n are all the same, and n is 3-4. 4 . A variable frequency drive shield tunneling hydraulic system according to claim 1 , wherein i is 1 to 15 in the hydraulic system branches of the propulsion cylinders with the same structure. 5 .

Images