Grouting equipment with precise grouting function and graded vibration anti-blocking function

Abstract

The invention belongs to the field of coal mine grouting, and particularly discloses grouting equipment with an accurate grouting function and graded vibration blockage prevention, which comprises a slurry storage tank, a slurry outlet pipe, a variable-frequency grouting pump, a grouting pipe, a filter device, a vibration mechanism and a pulse backflushing mechanism, an electromagnetic flowmeter is mounted at the rear end of the grouting pipe, and a self-operated pressure regulating valve is arranged at the front end of the grouting pipe. A nozzle is arranged at the front end of the grouting pipe, and a pressure sensor is mounted on the grouting pipe at the rear end of the nozzle. Blockage in the grouting process can be reduced as much as possible, and backflushing is carried out when blockage occurs until grout flows normally; besides, according to numerical values displayed by the electromagnetic flow meter and the pressure sensor, a frequency converter of the variable-frequency grouting pump and the self-operated pressure regulating valve are regulated and controlled in a combined mode, regulation is conducted according to needs, the electromagnetic flow meter and the pressure sensor conduct real-time detection, and therefore the grouting amount and the grouting pressure are accurately controlled.

Description

Technical Field

[0001] The invention relates to the field of coal mine grouting, in particular to a grouting device with precise grouting function and graded vibration anti-clogging. Background Art

[0002] Coal is my country's backup energy source. Although new energy sources are being used more and more widely, coal will remain one of my country's most important energy sources for a long time. During coal mining, gas contained in coal seams will continuously seep outward, causing major safety accidents. Therefore, gas pre-extraction must be carried out before mining to reduce the gas content in the coal seams. The gas extraction concentration depends on the quality of grouting and sealing. However, today's grouting equipment is relatively simple and is very likely to get clogged during the grouting process. At some grouting sites with high grouting requirements, the grouting volume and grouting pressure cannot be accurately controlled, resulting in unsatisfactory grouting results. Therefore, there is a need for a grouting equipment that can prevent blockage and simultaneously control the grouting volume and grouting pressure, thereby improving the quality of grouting and sealing, increasing the gas extraction concentration, and reducing the occurrence of safety accidents. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a grouting equipment with precise grouting function and graded vibration anti-clogging.

[0004] To achieve the above object, the present invention is implemented according to the following technical solutions: A grouting device with precise grouting function and graded vibration anti-clogging, comprising a slurry storage tank, a sedimentation area is provided at the bottom of the slurry storage tank, a slurry outlet pipe is connected to one side wall of the slurry storage tank above the sedimentation area, a variable frequency grouting pump is connected to the end of the slurry outlet pipe, a slurry outlet port of the variable frequency grouting pump is connected to the grouting pipe, a filtering device is provided in the slurry outlet pipe, the filtering device comprises a plurality of groups of filter mesh groups arranged in sequence from front to back in the slurry outlet pipe, the apertures of the plurality of filter mesh groups gradually decrease from front to back; a vibration mechanism is connected to the slurry outlet pipe outside each group of filter mesh groups; an electromagnetic flowmeter is installed at the rear end of the grouting pipe, a self-operated pressure regulating valve is provided at the front end of the grouting pipe, a nozzle is provided at the end of the front end of the grouting pipe, and a pressure sensor is installed on the grouting pipe at the rear end of the nozzle.

[0005] Furthermore, the filter mesh group is set to four groups, the first filter mesh group consists of two first filter meshes with a pore size of 22 mm and a spacing of 50 mm, the second filter mesh group consists of two second filter meshes with a pore size of 20 mm and a spacing of 50 mm, the third filter mesh group consists of two third filter meshes with a pore size of 15 mm and a spacing of 50 mm, the fourth filter mesh group consists of a fourth filter mesh with a pore size of 10 mm, the interval between adjacent two groups of the first filter mesh group, the second filter mesh group and the third filter mesh group is 80 mm, and the interval between the fourth filter mesh group and the third filter mesh group is 100 mm.

[0006] Furthermore, the vibration mechanism includes a sleeve fixedly sleeved on the outside of the pulp outlet pipe of each filter screen group and a variable frequency vibration motor connected to the outer wall of the sleeve.

[0007] Furthermore, the vibration frequencies of the variable frequency vibration motors at the first filter group, the second filter group, the third filter group and the fourth filter group are 5-10Hz, 12-18Hz, 20-25Hz and 30-35Hz respectively.

[0008] Furthermore, a pulse recoil mechanism is installed on the grouting pipe every 5-10 meters. The pulse recoil mechanism includes a high-pressure gas tank, an air pipe connected to the air outlet of the high-pressure gas tank, an electromagnetic valve and a one-way valve installed on the air pipe. The one-way valve is close to the outlet end of the air pipe, and the outlet end of the air pipe is connected to the grouting pipe.

[0009] Furthermore, the outlet end of the air pipe is arranged toward the slurry discharge direction of the grouting pipe.

[0010] Compared with the existing technology, the present invention can minimize the occurrence of blockages during the grouting process, and when blockage occurs, the pulse recoil mechanism can disperse the blocked slurry in the grouting pipe until the slurry flows normally; in some places where there are special requirements for grouting pressure and grouting volume, the frequency converter and self-operated pressure regulating valve of the variable frequency grouting pump are jointly regulated according to the values displayed by the electromagnetic flowmeter and the pressure sensor, and adjustments are made as needed, and the electromagnetic flowmeter and pressure sensor perform real-time detection, so as to achieve precise control of the grouting volume and grouting pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the present invention.

[0012] Figure 2 It is a structural schematic diagram of the filtering device in the slurry discharge pipe of the present invention.

[0013] Figure 3 It is a structural schematic diagram of the vibration mechanism on the pulp discharge pipe of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0015] like Figure 1-Figure 3As shown, this embodiment exemplarily shows a grouting equipment with precise grouting function and graded vibration anti-clogging, including a slurry storage tank 1, a sedimentation area 2 is provided at the bottom of the slurry storage tank 1, a slurry discharge pipe 5 is connected to one side wall of the slurry storage tank 1 above the sedimentation area 2, the end of the slurry discharge pipe 5 is connected to a variable frequency grouting pump 6, the slurry outlet of the variable frequency grouting pump 6 is connected to a grouting pipe 9, a filtering device 3 is provided in the slurry discharge pipe 5, the filtering device 3 includes a plurality of groups of filter mesh groups 31 arranged in sequence from front to back in the slurry discharge pipe 5, and the apertures of the plurality of groups of filter mesh groups gradually decrease from front to back; an electromagnetic flowmeter 7 is installed at the rear end of the grouting pipe 9, a self-operated pressure regulating valve 12 is provided at the front end of the grouting pipe 9, a nozzle 10 is provided at the end of the front end of the grouting pipe 9, and a nozzle 10 is installed on the grouting pipe 9 at the rear end of the nozzle 10. It is equipped with a pressure sensor 11; the variable frequency grouting pump 6 is variable frequency controlled, and the motor speed and actual working efficiency of the variable frequency grouting pump can be adjusted according to the actual situation on site to adjust the grouting amount; at the same time, an electromagnetic flowmeter 7 is installed at the outlet of the variable frequency grouting pump 6 to observe the real-time grouting amount, and a self-operated pressure regulating valve 12 is set on the grouting 9 to adjust the grouting pressure. A pressure sensor 11 is set near the nozzle 10 to record the grouting pressure in real time; when the grouting pressure and grouting amount need to be changed, the variable frequency speed regulator and the self-operated pressure regulating valve 12 of the variable frequency grouting pump 6 are jointly regulated and adjusted as needed, and the electromagnetic flowmeter and pressure sensor are detected in real time to achieve precise control of the grouting amount and grouting pressure.

[0016] like Figure 2 As shown, in this embodiment, the inner diameter of the slurry discharge pipe 5 is set to 50 mm, and the filter screen group 31 is set to four groups. The first filter screen group 311 consists of two first filter screens 3111 with a pore size of 22 mm and an interval of 50 mm. The second filter screen group 312 consists of two second filter screens 3121 with a pore size of 20 mm and an interval of 50 mm. The third filter screen group 313 consists of two third filter screens 3131 with a pore size of 15 mm and an interval of 50 mm. The fourth filter screen group 314 consists of a fourth filter screen 3141 with a pore size of 10 mm. The interval between adjacent two groups of the first filter screen group 311, the second filter screen group 312 and the third filter screen group 313 is 80 mm, and the interval between the fourth filter screen group 314 and the third filter screen group 313 is 100 mm. The four filter screen groups 31 can intercept solid particles of different sizes in the slurry one by one.

[0017] In this embodiment, Figure 3 As shown, the slurry outlet pipe 5 outside each filter screen group 31 is connected to a vibration mechanism 4; specifically, as Figure 3As shown, the vibration mechanism 4 includes a sleeve 41 fixedly sleeved on the outside of the pulp outlet pipe 5 of each group of filter screen groups 31 and a variable frequency vibration motor 42 connected to the outer wall of the sleeve 41. The sleeve 41 can be made of stainless steel, and the length of the sleeve 41 must completely exceed the length of each group of filter screen groups 31. For particles of different sizes, larger particles have greater inertia and require greater force to move them. Lower frequency vibrations can usually provide larger amplitudes. Therefore, in order to reach the resonant frequency of different particles and disperse them, the first group of filter screen groups 311 is exemplarily connected in this embodiment. The vibration frequencies of the variable frequency vibration motors 42 at the second filter screen group 312, the third filter screen group 313 and the fourth filter screen group 314 are set to 10Hz, 20Hz, 30Hz and 35Hz respectively. The vibration motor 42 is started while grouting. The vibration waves generated by the vibration motor 42 are transmitted to the solid particles accumulated at the filter screen through the pipe sleeve 41. This not only disperses the particles and realizes the separation of slurry and solid particles, so that the particles fall back into the sedimentation area 2 of the slurry storage tank 1, but also avoids excessive wear of the equipment or splashing of slurry due to excessive frequency, thereby ensuring the normal circulation of the slurry.

[0018] The grouting pipe 9 is provided with a pulse recoil mechanism 8 for injecting high pressure gas into the grouting pipe. A pulse recoil mechanism 8 is installed every 5-10 meters on the grouting pipe 9. Figure 1 As shown, this embodiment is illustrated by taking a pulse recoil mechanism 8 as an example. The pulse recoil mechanism 8 includes a high-pressure gas tank 81, an air pipe 82 connected to the air outlet of the high-pressure gas tank 81, an electromagnetic valve 83 and a one-way valve 84 installed on the air pipe 82. The one-way valve 84 is close to the outlet end of the air pipe 82, and the outlet end of the air pipe 82 is arranged toward the slurry discharge direction of the grouting pipe 9. The outlet end of the air pipe 82 is connected to the grouting pipe 9; when the grouting pipe 9 is blocked, the variable frequency grouting pump is turned off to stop grouting, and the electromagnetic valve 83 is opened. The high-pressure gas in the high-pressure gas tank 81 will enter the grouting pipe 9 in a pulsed manner, and the huge gas pressure will disperse the blocked slurry until the slurry flows normally.

[0019] like Figure 1 As shown, when the equipment of this embodiment is used for grouting, the variable frequency vibration motor 42 and the variable frequency grouting pump 6 are turned on at the same time to perform grouting. During grouting, the first filter screen group 311, the second filter screen group 312, the third filter screen group 313 and the fourth filter screen group 314 can intercept solid particles of different sizes in the slurry one by one, and the vibration wave generated by the variable frequency vibration motor 42 is transmitted to the solid particles accumulated at the filter screen through the pipe sleeve 41, so that the particles can be vibrated and dispersed, and the slurry solid particles are separated, so that the particles fall back into the sedimentation area 2 of the slurry storage tank 1, and the excessive wear of the equipment or splashing of the slurry due to excessive frequency is avoided, thereby ensuring the normal circulation of the slurry; When the grouting pipe 9 is clogged, the variable frequency grouting pump 6 is turned off to stop grouting, and the solenoid valve 83 is opened. The high-pressure gas in the high-pressure gas tank 81 will enter the grouting pipe 9 in a pulsed manner. The huge gas pressure will disperse the clogged slurry until the slurry flows normally. The function of the one-way valve 84 is to prevent the clogged slurry from flowing back into the high-pressure gas tank 81 and causing a dangerous accident.

[0020] In some places where there are special requirements for grouting pressure and grouting volume, according to the on-site requirements and the values displayed by the electromagnetic flowmeter 7 and the pressure sensor 11 on the grouting pipe 9, the variable frequency speed regulator and the self-operated pressure regulating valve 12 of the variable frequency grouting pump 6 are jointly regulated and adjusted as needed, and the electromagnetic flowmeter and pressure sensor are tested in real time to achieve precise control of the grouting volume and grouting pressure.

[0021] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Any technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A grouting device with precise grouting function and graded vibration anti-clogging, comprising a grouting tank (1), a sedimentation area (2) provided at the bottom of the grouting tank (1), a grouting pipe (5) connected to a side wall of the grouting tank (1) above the sedimentation area (2), a variable frequency grouting pump (6) connected to the end of the grouting pipe (5), a grouting outlet of the variable frequency grouting pump (6) connected to a grouting pipe (9), characterized in that: The slurry outlet pipe (5) is provided with a filtering device (3), and the filtering device (3) includes a plurality of filter screen groups (31) arranged in sequence from front to back in the slurry outlet pipe (5), and the apertures of the plurality of filter screen groups gradually decrease from front to back; a vibration mechanism (4) is connected to the slurry outlet pipe (5) outside each filter screen group; a pulse recoil mechanism (8) for pulse injection of high-pressure gas into the grouting pipe (9) is installed on the grouting pipe (9); an electromagnetic flowmeter (7) is installed at the rear end of the grouting pipe (9), a self-operated pressure regulating valve (12) is provided at the front end of the grouting pipe (9), a nozzle (10) is provided at the end of the front end of the grouting pipe (9), and a pressure sensor (11) is installed on the grouting pipe (9) at the rear end of the nozzle (10).

2. The grouting equipment with precise grouting function and graded vibration anti-clogging according to claim 1 is characterized in that: The filter mesh groups (31) are arranged into four groups, wherein the first filter mesh group (311) is composed of two first filter meshes (3111) with a pore size of 22 mm and a spacing of 50 mm, the second filter mesh group (312) is composed of two second filter meshes (3121) with a pore size of 20 mm and a spacing of 50 mm, the third filter mesh group (313) is composed of two third filter meshes (3131) with a pore size of 15 mm and a spacing of 50 mm, and the fourth filter mesh group (314) is composed of a fourth filter mesh (3141) with a pore size of 10 mm. The spacing between adjacent groups of the first filter mesh group (311), the second filter mesh group (312) and the third filter mesh group (313) is 80 mm, and the spacing between the fourth filter mesh group (314) and the third filter mesh group (313) is 100 mm.

3. The grouting equipment with precise grouting function and graded vibration anti-clogging according to claim 2 is characterized in that: The vibration mechanism (4) comprises a sleeve (41) fixedly sleeved on the outside of the pulp outlet pipe (5) of each filter screen group (31) and a variable frequency vibration motor (42) connected to the outer wall of the sleeve (41).

4. The grouting equipment with precise grouting function and graded vibration anti-clogging according to claim 3 is characterized in that: The vibration frequencies of the variable frequency vibration motors (42) at the first filter group (311), the second filter group (312), the third filter group (313), and the fourth filter group (314) are 5-10 Hz, 12-18 Hz, 20-25 Hz, and 30-35 Hz, respectively.

5. The grouting equipment with precise grouting function and graded vibration anti-clogging according to claim 1 is characterized in that: A pulse recoil mechanism (8) is installed on the grouting pipe (9) every 5-10 meters. The pulse recoil mechanism (8) includes a high-pressure gas tank (81), an air pipe (82) connected to the air outlet of the high-pressure gas tank (81), a solenoid valve (83) and a one-way valve (84) installed on the air pipe (82). The one-way valve (84) is close to the outlet end of the air pipe (82), and the outlet end of the air pipe (82) is connected to the grouting pipe (9).

6. The grouting equipment with precise grouting function and graded vibration anti-clogging according to claim 5 is characterized in that: The outlet end of the air pipe (82) is arranged toward the slurry discharge direction of the grouting pipe (9).

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