CN213002468U

CN213002468U - Continuous sand mixer

Info

Publication number: CN213002468U
Application number: CN202021772523.5U
Authority: CN
Inventors: 莫贻贵; 柳玉川; 訾陆坤; 柳嵩
Original assignee: Jinan Liuyuxin Machinery Equipment Co ltd
Current assignee: Jinan Liuyuxin Machinery Equipment Co ltd
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-04-20
Anticipated expiration: 2030-08-21

Abstract

The utility model relates to a continuous sand mixer, it is including mixing sand pipe and fixed beam, mix sand pipe and fixed beam fixed connection, the fixed reduction gear that is provided with of one end of mixing sand pipe, the fixed driving motor that is provided with in one side of reduction gear, driving motor's output shaft is connected with the input shaft transmission of reduction gear, sand mixing pipe has seted up into sand mouth and two inlets near the one end of reduction gear, sand mixing pipe keeps away from the one end of reduction gear and has seted up the discharge gate, the intraductal rotation of sand mixing is connected with the drive shaft, the one end of drive shaft is connected with the output shaft transmission of reduction gear, the fixed conveying component that is used for conveying the raw materials that is provided with in the drive shaft, sand mixing. The sand, the adhesive and the accelerator which are in contact with the reverse plate are blocked, so that the sand, the adhesive and the accelerator of the blocked part are in contact and mixed with the sand, the adhesive and the accelerator of the normally transported part, and finally the effect of increasing the mixing sufficiency of the sand, the adhesive and the accelerator is achieved.

Description

Continuous sand mixer

Technical Field

The application relates to the technical field of sand mixing equipment, in particular to a continuous sand mixer.

Background

The casting is a metal molding object obtained by various casting methods, and the smelted liquid metal is injected into a casting mold prepared in advance by pouring, injection, suction or other pouring methods, and the object with certain shape, size and performance is obtained after the processes of cooling, polishing and the like. In casting a casting, resin sand, which is molding sand or core sand mixed with synthetic resin as a binder, an accelerator and sand grains, is generally used. When the resin sand is mixed, a sand mixer is needed, sand, a binder and an accelerator are injected into the sand mixer, and then the sand, the binder and the accelerator are fully mixed together in the sand mixer.

In the prior art, as disclosed in chinese utility model patent with publication number CN207787607U, a continuous sand mixer is disclosed, comprising a frame, a mixing device connected to the frame, and a sand inlet hopper connected to the mixing device, wherein the mixing device comprises a conveying sand mixing mechanism and a final mixing mechanism, one end of the conveying sand mixing mechanism is connected to the sand inlet hopper, and the other end is connected to the final mixing mechanism; temperature control cylinders are sleeved on the outer sides of the conveying sand mixing mechanism and the final mixing mechanism, and gaps for introducing temperature control media are formed among the temperature control cylinders, the conveying sand mixing mechanism and the final mixing mechanism; the continuous sand mixer further comprises a water mist device, and the water mist device is communicated with the conveying sand mixing mechanism and the final mixing mechanism respectively. The utility model discloses a carry sand mulling mechanism and mix mechanism realization continuous mulling finally, simultaneously through setting up a control by temperature change section of thick bamboo and water smoke device, carry out effective control to sand temperature and inside humidity at continuous mulling in-process, help improving the performance of sand.

In view of the above-described related art, the inventors considered that when the resin sand is manufactured using the sand mixer, since the screw conveyor can simply stir only the sand, the binder, and the accelerator, there is a defect that the sand, the binder, and the accelerator cannot be sufficiently mixed.

SUMMERY OF THE UTILITY MODEL

In order to increase the sufficiency in mixing sand, binder and accelerator, the present application provides a continuous sand mixer.

The application provides a continuous sand mixer adopts following technical scheme:

the utility model provides a continuous sand mixer, includes mixed sand pipe and fixed beam, mixed sand pipe and fixed beam fixed connection, the fixed reduction gear that is provided with of one end of mixed sand pipe, the fixed driving motor that is provided with in one side of reduction gear, driving motor's output shaft is connected with the input shaft transmission of reduction gear, the one end that mixed sand pipe is close to the reduction gear has been seted up into sand mouth and two inlets, the one end that mixed sand pipe kept away from the reduction gear has been seted up the discharge gate, the intraductal rotation of mixed sand is connected with the drive shaft, the one end of drive shaft is connected with the output shaft transmission of reduction gear, the fixed conveying component that is used for conveying the raw materials that is provided with in the drive shaft, the fixed a plurality of reverse.

By adopting the technical scheme, when the sand, the adhesive and the accelerant are mixed by using the sand mixer, an external sand supply device is communicated with the sand inlet, an external binder and accelerator supply device is respectively communicated with the two liquid inlets, a driving motor is started, so that the driving shaft rotates under the action of the speed reducer and the driving motor, and simultaneously, the conveying component conveys sand grains, the adhesive and the accelerant, while the conveying mechanism conveys the sand grains, the adhesive and the accelerant, the sand grains, the adhesive and the accelerant are contacted with the reverse plate, and then the sand grains, the adhesive and the accelerant contacted with the reverse plate are blocked, therefore, the sand grains, the bonding agent and the accelerator of the blocked part are contacted and mixed with the sand grains, the bonding agent and the accelerator of the normally transported part, and finally the effect of increasing the mixing sufficiency of the sand grains, the bonding agent and the accelerator is achieved.

Preferably, the conveying component comprises a conveying assembly and a plurality of stirring claws, the conveying assembly is fixedly arranged at one section of the driving shaft close to the speed reducer, the stirring claws are fixedly arranged on the rest sections of the driving shaft, and the stirring claws are spirally arranged on the driving shaft.

Through adopting above-mentioned technical scheme, at the roller mill during operation, conveying component transports sand grain, makes then sand grain transported to the position that the inlet was located to make sand grain and binder and promoter mix, then sand grain, binder and promoter are transported through dialling to grab, thereby make sand grain, binder and promoter intensive mixing, conveying component transports the entering volume that can guarantee sand grain in the roller mill pipe to sand grain, and then improves roller mill's work efficiency.

Preferably, it is a plurality of dial and grab all including bracing piece, connection piece and scraper blade, the one end and the drive shaft fixed connection of support, the other end of bracing piece and the one end fixed connection of connection piece, the other end and the scraper blade fixed connection of connection piece, the other end of scraper blade and the inner wall butt of muddy sand pipe can with the emergence relative rotation of muddy sand pipe, a plurality of the scraper blade sets up with the reversal board that corresponds separately is crisscross.

By adopting the technical scheme, when the scraping plate transports sand grains, the adhesive and the accelerant, the scraping plate drives the sand grains, the adhesive and the accelerant, so that the scraping plate, the supporting rod and the connecting sheet transport the sand grains, the adhesive and the accelerant, when the scraping plate transports the sand grains, the adhesive and the accelerant, part of the sand grains, the adhesive and the accelerant in contact with the scraping plate are driven by the scraping plate to move towards the top of the sand mixing pipe, so that the sand grains, the adhesive and the accelerant on the upper part of the sand mixing pipe fall to the bottom of the sand mixing pipe under the extrusion action of self gravity and the scraping plate, the mixing sufficiency of the sand mixer on the sand grains, the adhesive and the accelerant is increased, when the scraping plate transports the sand grains, the adhesive and the accelerant, the scraping plate is abutted against the inner wall of the sand mixing pipe and moves relatively, and the possibility that the sand grains, the adhesive and, the scraping plates and the corresponding reverse plates are arranged in a staggered mode, and the possibility that the scraping plates and the reverse plates affect each other to work can be reduced.

Preferably, the radial cross section of the driving shaft is a regular hexagon, and the plurality of support rods are arranged on three circumferential side surfaces of the driving shaft spaced from each other.

Through adopting above-mentioned technical scheme, when the drive shaft rotated, be hexagonal drive shaft and can extrude and stir sand grain, binder and promoter to make sand grain, binder and promoter mix more abundant in the mulling, the bracing piece is arranged and can be increased in the mulling on the three week side face of drive shaft alternate each other and can hold the space of sand grain, binder and promoter, finally reaches the efficiency that increases the mulling of roller mill.

Preferably, the conveying assembly comprises a rotating pipe and helical blades, the rotating pipe and the driving shaft are coaxially and fixedly sleeved, and the helical blades are fixedly arranged on the peripheral side wall of the rotating pipe.

Through adopting above-mentioned technical scheme, when conveyor components carried the sand grain, the rotating tube followed the drive shaft and rotated, thereby made the rotating tube drive helical blade rotate and make helical blade carry the sand grain then, and then reached the effect that increases sand mixer's the sand inlet speed.

Preferably, the plurality of the pulling claws are obliquely arranged with the radial section of the driving shaft, and the oblique direction between the pulling claws and the radial section of the driving shaft is parallel to the spiral direction of the spiral blade.

By adopting the technical scheme, when the shifting grab conveys sand grains, the adhesive and the accelerant, the shifting grab which is obliquely arranged with the driving shaft can increase the transmission efficiency of the shifting grab on the sand grains, the adhesive and the accelerant, and further improve the sand mixing speed of the sand mixer.

Preferably, the plurality of reverse plates are obliquely arranged with the radial section of the sand mulling pipe, and the oblique direction between the reverse plates and the radial section of the sand mulling pipe is opposite to the spiral direction of the spiral blade.

Through adopting above-mentioned technical scheme, when sand grain, binder and promoter are carried to reverse board position, reverse board blocks sand grain, binder and promoter, make the sand grain that is blockked, binder and promoter and the sand grain by the forward conveying, binder and promoter mix, thereby increase sand mulling effect of roller mill, be the quantity that the reverse board that the slope set up with roller mill radial cross-section can increase the sand grain that is blockked, binder and promoter, finally make the roller mill to the sand grain, binder and promoter mix more abundant.

Preferably, the fixed beam and the sand mulling pipe are arranged in parallel, and the sand inlet and the liquid inlet are communicated with the fixed beam.

Through adopting above-mentioned technical scheme, when using the roller mill, it is fixed with the fixed beam through the bolt pair, realizes the fixed of roller mill then, with outside confession sand device and supply liquid device respectively with sand inlet and inlet intercommunication to make sand grain, binder and promoter get into in the roller mill, can increase the stability of roller mill during operation with fixed beam and roller mill parallel arrangement.

Preferably, the fixed beam is provided with a sand inlet pipe corresponding to the sand inlet, the fixed beam is provided with a liquid inlet pipe corresponding to the two liquid inlets, and the two ends of the liquid inlet pipe far away from the fixed beam are provided with internal threads.

Through adopting above-mentioned technical scheme, when using the roller mill, with outside confession sand device with advance sand pipe intercommunication setting, it is intraductal to make outside confession sand device's sand get into the roller mill through advancing sand pipe, liquid outlet and feed liquor pipe threaded connection with outside liquid supply device, then make outside binder and the promoter of liquid supply device get into the roller mill through the feed liquor pipe intraductal, outside liquid supply device's liquid outlet and feed liquor pipe threaded connection can increase the leakproofness between outside liquid supply device and the feed liquor pipe, and then reduce the gap outflow between binder and the promoter through liquid supply device and feed liquor pipe.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through arranging the sand mixing pipe, the fixed beam, the speed reducer, the driving motor, the sand inlet, the liquid inlets, the conveying component and the reverse plate, when the sand mixer is used for mixing sand grains, adhesive and accelerant, the external sand supply device is communicated with the sand inlet, the external adhesive and accelerant supply device is respectively communicated with the two liquid inlets, the driving motor is started, so that the driving shaft rotates under the action of the speed reducer and the driving motor, meanwhile, the conveying component conveys the sand grains, the adhesive and the accelerant, when the conveying mechanism conveys the sand grains, the adhesive and the accelerant, the sand grains, the adhesive and the accelerant are contacted with the reverse plate, then the sand grains, the adhesive and the accelerant contacted with the reverse plate are blocked, and the sand grains, the adhesive and the accelerant at the blocked part are contacted and mixed with the sand grains, the adhesive and the accelerant at the normally conveyed part, finally, the effect of increasing the mixing sufficiency of the sand grains, the adhesive and the accelerator is achieved;

2. grab with dialling through setting up conveying assembly, at the sand mixer during operation, conveying assembly transports the sand grain, then make the sand grain transported to the position at inlet place, thereby make sand grain and binder and promoter mix, then sand grain, binder and promoter are grabbed again through dialling and are transported, thereby make sand grain, binder and promoter intensive mixing, conveying assembly transports the entering volume that can guarantee sand grain in the sand mixer pipe to the sand grain, and then improves the work efficiency of sand mixer.

3. By arranging the supporting rod, the connecting sheet and the scraper, when the grab transports sand grains, the adhesive and the accelerant, the scraper drives the sand, the adhesive and the accelerant so that the scraper, the support rod and the connecting piece convey the sand, the adhesive and the accelerant, when the shifting claw transports the sand grains, the adhesive and the accelerant, part of the sand grains, the adhesive and the accelerant which are contacted with the scraper are driven by the scraper to move towards the top of the sand mixing pipe, thereby leading the sand grains, the adhesive and the accelerant on the upper part of the sand mixing pipe to fall to the bottom of the sand mixing pipe under the extrusion action of the self gravity and the scraper plate, further increasing the mixing sufficiency of the sand mixer on the sand grains, the adhesive and the accelerant, when the scraper conveys sand grains, the adhesive and the accelerant, the scraper is abutted against the inner wall of the sand mixing pipe and moves relatively, and the possibility that the sand grains, the adhesive and the accelerant are adhered to the inner wall of the sand mixing pipe is further reduced.

Drawings

FIG. 1 is a schematic structural diagram of the present application;

FIG. 2 is a cross-sectional view of the present application, primarily illustrating the internal structure of the sand mixing pipe;

fig. 3 is a schematic structural view of the grab.

Description of reference numerals: 100. a sand mixing pipe; 110. a sand inlet; 111. a sand inlet pipe; 120. a liquid inlet; 121. a liquid inlet pipe; 130. a discharge port; 140. a reversing plate; 200. a fixed beam; 300. a speed reducer; 400. a drive motor; 500. a drive shaft; 600. a conveying member; 610. a delivery assembly; 611. rotating the tube; 612. a helical blade; 620. pulling and grabbing; 621. a support bar; 622. connecting sheets; 623. a squeegee; 624. a blade.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses continuous sand mixer.

Referring to fig. 1 and 2, the continuous sand mixer includes a sand mixing pipe 100 and a fixed beam 200, the sand mixing pipe 100 and the fixed beam 200 are arranged in parallel and fixedly connected through a bolt pair, one end of the sand mixing pipe 100 is fixedly connected with a speed reducer 300 through a bolt pair, and one side of the speed reducer 300 is fixedly provided with a driving motor 400 through a bolt. An output shaft of the driving motor 400 is in transmission connection with an input shaft of the speed reducer 300, one end of the sand mulling pipe 100 close to the speed reducer 300 is communicated with a sand inlet 110 and two liquid inlets 120, the sand inlet 110 and the liquid inlets 120 are communicated with the fixed beam 200, and the sand inlet 110 and the two liquid inlets 120 are sequentially arranged along a direction far away from the speed reducer 300. The fixed welding that corresponds into sand mouth 110 on the fixed beam 200 has into sand pipe 111, and the equal fixed welding that corresponds two inlet 120 on the fixed beam 200 has a feed liquor pipe 121, and the one end that fixed beam 200 was kept away from to feed liquor pipe 121 is seted up there is the internal thread, and the one end that the reduction gear 300 was kept away from to mullion pipe 100 has seted up discharge gate 130.

Referring to fig. 2 and 3, a driving shaft 500 having a regular hexagonal radial cross-section is rotatably connected to the sand mulling tube 100, and one end of the driving shaft 500 is drivingly connected to an output shaft of the reducer 300. The conveying component 600 for conveying the raw materials is fixedly mounted on the driving shaft 500, the conveying component 600 comprises a conveying assembly 610 and a plurality of pulling claws 620, the conveying assembly 610 is fixedly mounted on one section of the driving shaft 500 close to the speed reducer 300, the conveying assembly 610 is positioned right below the sand inlet 110, the pulling claws 620 are fixedly mounted on the rest sections of the driving shaft 500, and the pulling claws 620 are spirally arranged on the driving shaft 500. The conveying assembly 610 comprises a rotating pipe 611 and a spiral blade 612, the rotating pipe 611 and the driving shaft 500 are coaxially and fixedly sleeved, and the spiral blade 612 is fixedly welded on the peripheral side wall of the rotating pipe 611.

The plurality of pulling claws 620 respectively comprise a supporting rod 621, a connecting piece 622 and a scraper 623, one end of the supporting rod is fixedly welded with the driving shaft 500, the other end of the supporting rod 621 is fixedly welded with one end of the connecting piece 622, the other end of the connecting piece 622 is vertically and fixedly welded with the scraper 623, one end of the scraper 623, which is far away from the connecting piece 622, is fixedly provided with a blade 624, the blade 624 abuts against the inner wall of the sand mulling tube 100 and can rotate relative to the sand mulling tube 100, and the plurality of supporting rods 621 are uniformly arranged on three circumferential side surfaces of the driving shaft 500, which are spaced. When the pulling claw 620 transports sand, the adhesive and the accelerator, the blade 624 is abutted against the inner wall of the sand mixing pipe 100 and moves relatively, so that the blade 624 scrapes off the sand, the adhesive and the accelerator on the inner wall of the sand mixing pipe 100, and finally the condition that the sand, the adhesive and the accelerator are adhered to the inner wall of the sand mixing pipe 100 is reduced.

In order to increase the mixing effect of the sand mixer on sand, a binder and an accelerator, a plurality of reverse plates 140 are fixedly welded to the inner wall of the sand mixing pipe 100, and a plurality of scraping plates 623 are arranged in a staggered manner with the respective reverse plates 140. When the sand, the adhesive and the accelerator are transported in the forward direction by the scraper 623, the reverse plate 140 blocks the sand, the adhesive and the accelerator, so that the blocked sand, the adhesive and the accelerator are mixed with the sand, the adhesive and the accelerator transported in the forward direction, and the mixing effect of the sand mixer on the sand, the adhesive and the accelerator is further increased.

In order to increase the conveying effect of the pulling claws 620 on sand, adhesive and accelerator, a plurality of pulling claws 620 are arranged obliquely to the radial section of the drive shaft 500, and the oblique direction between the plurality of pulling claws 620 and the radial section of the drive shaft 500 is parallel to the spiral direction of the spiral blade 612. The plurality of reverse plates 140 are all obliquely arranged with the radial cross section of the mullion tube 100, and the oblique direction between the plurality of reverse plates 140 and the radial cross section of the mullion tube 100 is opposite to the spiral direction of the spiral blade 612. When the pulling claw 620 conveys sand, the adhesive and the accelerator, the scraper 623 which is obliquely arranged can accelerate the conveying efficiency of the sand, the adhesive and the accelerator, the reverse plate 140 which is opposite to the spiral direction of the spiral blade 612 can increase the amount of the blocked sand, the adhesive and the accelerator, and finally the effect of the sand mixer on the mixing effect of the sand, the adhesive and the accelerator is increased.

The implementation principle of the continuous sand mixer in the embodiment of the application is as follows: when the sand mixer is used for mixing sand grains, the binder and the accelerant, a sand outlet of the external sand supply device is communicated with the sand inlet pipe 111, liquid supply devices for supplying the binder and the accelerant are respectively in threaded connection with the corresponding liquid inlets 120, and therefore the binder and the accelerant are reduced from flowing out through a gap between the liquid outlet of the external liquid supply device and the liquid inlet pipe 121. The driving motor 400 is started, so that the driving shaft 500 rotates under the action of the driving motor 400 and the reducer 300, and then the driving shaft 500 drives the rotating pipe 611 to rotate, so that the rotating pipe 611 drives the helical blade 612 to rotate, and then the helical blade 612 transports sand. The sand conveyed by the helical blade 612 is conveyed to the positions of the two liquid inlets 120, and then the sand is mixed with the adhesive and the accelerator, so that the shifting claw 620 conveys the sand, the adhesive and the accelerator, and when the shifting claw 620 conveys the sand, the adhesive and the accelerator, the scraper 623 brings the sand, the adhesive and the accelerator at the bottommost part of the sand mixing pipe 100 to the upper part of the sand mixing pipe 100, so that the sand, the adhesive and the accelerator at the upper part of the sand mixing pipe 100 fall under the extrusion and self gravity of the scraper 623, and the mixing effect of the sand, the adhesive and the accelerator in the sand mixing pipe 100 is further improved. After the sand, the adhesive and the accelerator transported by the scraper 623 abut against the reversing plate 140, the sand, the adhesive and the accelerator are blocked by the reversing plate 140, so that the blocked sand, the adhesive and the accelerator are mixed with the sand, the adhesive and the accelerator transported in the forward direction, and the mixing effect of the sand, the adhesive and the accelerator in the sand mixing pipe 100 is further increased. In the process of transporting sand, adhesive and accelerant by the pulling claw 620, the blades 624 on the scraper 623 abut against the inner wall of the sand mixing pipe 100 and move relatively, and finally the effect of scraping off the sand, the adhesive and the accelerant adhered to the inner wall of the sand mixing pipe 100 is achieved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A continuous sand mixer is characterized in that: comprises a sand mixing pipe (100) and a fixed beam (200), wherein the sand mixing pipe (100) is fixedly connected with the fixed beam (200), one end of the sand mixing pipe (100) is fixedly provided with a speed reducer (300), one side of the speed reducer (300) is fixedly provided with a driving motor (400), the output shaft of the driving motor (400) is in transmission connection with the input shaft of the speed reducer (300), one end of the sand mixing pipe (100) close to the speed reducer (300) is provided with a sand inlet (110) and two liquid inlets (120), one end of the sand mixing pipe (100) far away from the reducer (300) is provided with a discharge hole (130), a driving shaft (500) is rotationally connected in the sand mixing pipe (100), one end of the driving shaft (500) is in transmission connection with an output shaft of the speed reducer (300), a conveying component (600) for conveying the raw materials is fixedly arranged on the driving shaft (500), the inner wall of the sand mixing pipe (100) is fixedly provided with a plurality of reverse plates (140).

2. A continuous roller mill according to claim 1, characterized in that: the conveying member (600) comprises a conveying assembly (610) and a plurality of pulling claws (620), the conveying assembly (610) is fixedly arranged at one section, close to the speed reducer (300), of the driving shaft (500), the pulling claws (620) are fixedly arranged on the rest sections of the driving shaft (500), and the pulling claws (620) are spirally arranged on the driving shaft (500).

3. A continuous roller mill according to claim 2, characterized in that: it is a plurality of grab (620) all include bracing piece (621), connection piece (622) and scraper blade (623), the one end and drive shaft (500) fixed connection of support, the other end of bracing piece (621) and the one end fixed connection of connection piece (622), the other end and scraper blade (623) fixed connection of connection piece (622), the other end and the inner wall butt of mulling pipe (100) of scraper blade (623) can with the relative rotation of emergence of mulling pipe (100), a plurality of scraper blade (623) and the reverse board (140) crisscross setting that corresponds separately.

4. A continuous roller mill according to claim 3, characterized in that: the radial section of the driving shaft (500) is in a regular hexagon shape, and the plurality of supporting rods (621) are arranged on three circumferential side surfaces of the driving shaft (500) which are spaced from each other.

5. A continuous roller mill according to claim 4, characterized in that: the conveying assembly (610) comprises a rotating pipe (611) and a spiral blade (612), the rotating pipe (611) and the driving shaft (500) are coaxially and fixedly sleeved, and the spiral blade (612) is fixedly arranged on the peripheral side wall of the rotating pipe (611).

6. A continuous roller mill according to claim 5, characterized in that: the plurality of the pulling claws (620) are obliquely arranged with the radial section of the driving shaft (500), and the oblique direction between the plurality of the pulling claws (620) and the radial section of the driving shaft (500) is parallel to the spiral direction of the spiral blade (612).

7. A continuous roller mill according to claim 6, characterized in that: the plurality of reverse plates (140) are obliquely arranged with the radial section of the sand mixing pipe (100), and the oblique direction between the plurality of reverse plates (140) and the radial section of the sand mixing pipe (100) is opposite to the spiral direction of the spiral blade (612).

8. A continuous roller mill according to claim 1, characterized in that: the fixed beam (200) and the sand mulling pipe (100) are arranged in parallel, and the sand inlet (110) and the liquid inlet (120) are communicated with the fixed beam (200).

9. A continuous roller mill according to claim 8, characterized in that: the fixed beam (200) is provided with sand inlet pipe (111) corresponding to sand inlet (110), the fixed beam (200) is provided with liquid inlet pipe (121) corresponding to two liquid inlets (120), and two internal threads are formed in one end, far away from the fixed beam (200), of the liquid inlet pipe (121).