T-beam grouting pressure injection device

Abstract

The utility model discloses a T-beam grouting pressure-injection device which comprises an LJ-YJB1 circulating grouting system, a grouting cover and a plurality of connecting guide pipes, the grouting cover is fixedly sealed at the end of an anchorage device, each connecting guide pipe is connected with slurry ports of two anchorage device seats, the slurry ports are communicated with the inside of a corrugated pipe, the LJ-YJB1 circulating grouting system comprises a stirrer and a grouting machine, and the stirring machine is connected with the grouting machine. According to the circulating grouting device, circulating grouting is formed in the grouting process in the multiple corrugated pipes in the T-shaped beam, the grouting cover which is fixed in a sealed mode is arranged at the position of the anchorage device, it is guaranteed that the whole grouting is conducted stably, and the problems that the grouting quality is poor and the grouting pressure is unstable due to grout leakage are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of T-beam grouting and injection equipment, and relates to a T-beam grouting and injection device. Background Art

[0002] T-beam prefabrication is primarily divided into reinforcement, formwork, concrete, and prestressed concrete. The traditional method for grouting bridge pipes with anchors is to use a "mushroom-shaped" method to seal and maintain pressure. However, this sealing and pressure-maintaining effect is less than ideal during actual construction, affecting the density of the slurry in the pipes. During the pressure-maintaining phase of the grouting process, the anchor cement seal is damaged, resulting in a loss of pressure. This can lead to incomplete grouting of the prestressed pipes, which can cause bridge defects during subsequent operation. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a T-beam grouting and injection device, which can achieve stable pressure maintenance, ensure the density of the slurry in the corrugated pipe, make the prestressed pipe grouting full, and improve the performance of the T-beam.

[0004] The technical solution adopted by the utility model is as follows: a T-beam grouting and injection device, including an LJ-YJB1 circulating grouting system, a grouting cover and a connecting conduit. The grouting cover is fixedly sealed at the end of the anchor. The connecting conduit adopts multiple pieces, each of which is connected to the slurry ports of two anchor seats. The slurry ports are communicated with the inside of the corrugated pipe. The LJ-YJB1 circulating grouting system includes a mixer and a grouting machine. The slurry outlet of the grouting machine is connected to the slurry port of the anchor seat through a slurry inlet pipe. The slurry port of the anchor seat is located on the upper corrugated pipe. At one end, the slurry port at the other end of the upper corrugated pipe is connected to the slurry port at that end of the right corrugated pipe in the lower two corrugated pipes through a connecting conduit, the slurry port at the other end of the right corrugated pipe is connected to the slurry port at that end of the middle corrugated pipe, the slurry port at the other end of the middle corrugated pipe is connected to the slurry port at that end of the left corrugated pipe in the lower two corrugated pipes, the slurry port at the other end of the left corrugated pipe in the lower two corrugated pipes is connected to the mixer through a slurry outlet pipe, the mixer is connected to the grouting machine through a pump and a pipeline, and the entire grouting equipment forms a circulating grouting.

[0005] Furthermore, the above-mentioned grouting cover includes a steel casing, an end panel and a sealing rubber pad. The outer end of the steel casing is fixedly sealed and connected to the end panel. The end panel is provided with two through holes. The two through holes pass through two screws to fix the grouting cover to the anchor seat. The sealing rubber pad is an annular structure with an annular groove on one side. The sealing rubber pad is sleeved on the end of the steel casing through the annular groove. The parallel surface of the sealing rubber pad is against the end face of the anchor near the edge. The grouting cover of this structure is easy to assemble and disassemble, and utilizes the threaded holes on the existing anchor plate and is directly locked with screws. The connection is reliable and stable, and can withstand stable connection under high pressure. The addition of a sealing rubber pad can improve the sealing effect and avoid poor slurry pressurization stability caused by leakage.

[0006] Furthermore, the above-mentioned includes an inner stirring shaft, a stirring sleeve, a lower stirring blade and an upper stirring blade. The lower end of the stirring sleeve is fixedly connected to a plurality of upper stirring blades, and the plurality of upper stirring blades are evenly arranged along the circumference of the lower end of the stirring sleeve. The inner stirring shaft is rotatably connected in the stirring sleeve and is connected to a plurality of lower stirring blades after the lower end extends out of the stirring sleeve. The plurality of lower stirring blades are evenly arranged along the circumference of the lower end of the inner stirring shaft. The lower stirring blades and the upper stirring blades are arranged at intervals. The upper end of the stirring sleeve is rotatably connected to the supporting frame, the supporting frame is rotatably connected to the top of the slurry storage tank, and the upper end is fixedly connected to a third gear after it is extended, and the second gear meshes with the third gear. The wheel is fixedly connected to the drive shaft, and the drive shaft is rotatably connected to the top plate of the upper frame. The upper frame is fixedly connected to the support frame. The first gear meshing with the second gear is fixedly connected to the motor shaft of the stirring motor. The stirring motor is inverted and fixedly connected to the top of the upper frame. The upper end of the drive shaft extends out of the upper frame and is fixedly connected to a crank. The other end of the crank is hinged to one end of a connecting rod, and the other end of the connecting rod is hinged to a hinge pin on the rotating disk. The hinge pin is arranged away from the center of the rotating disk. The middle of the rotating disk is fixedly connected to the end of the stirring sleeve extending out of the upper frame. The stirring sleeve is rotatably connected to the upper frame. The rotating disk, crank, and connecting rod constitute a double crank mechanism. The arrangement of the dual stirring shafts and the opposite rotation directions of the stirring blades in the utility model achieves a better stirring effect. During flow, the possibility of solidification of the stirred slurry is reduced, fluidity is improved, and waste is reduced.

[0007] The beneficial effects of the present invention: Compared with the prior art, the present invention forms a circulating grouting process in multiple corrugated tubes in the T-beam, and arranges a sealed and fixed grouting cover at the anchor to ensure that the entire grouting is carried out stably, avoiding the problems of poor grouting quality and unstable grouting pressure caused by leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 Schematic diagram of grouting end sealing structure;

[0009] Figure 2 This is a schematic diagram of the pipe connection at the left end of the T-beam;

[0010] Figure 3 This is a schematic diagram of the pipe connection at the right end of the T-beam;

[0011] Figure 4 for Figure 1 A schematic diagram of the enlarged structure of the middle B part;

[0012] Figure 5 This is a schematic diagram of the grouting cover connection structure;

[0013] Figure 6 Schematic diagram of the mixing equipment structure. DETAILED DESCRIPTION

[0014] The utility model will be further introduced below with reference to the accompanying drawings and specific embodiments.

[0015] Example 1: Figures 1 to 6 As shown, a T-beam grouting and injection device includes an LJ-YJB1 circulating grouting system, a grouting cover 301 and a connecting conduit 302. The grouting cover 301 is fixedly sealed at the end of the anchor 106. The connecting conduit 302 adopts multiple roots, each of which is connected to the slurry ports of two anchor seats 104. The slurry ports are communicated with the inside of the corrugated pipe. The LJ-YJB1 circulating grouting system includes a mixer 303 and a grouting machine 304. The slurry outlet of the grouting machine 304 is connected to the slurry port of the anchor seat 104 through a slurry inlet pipe 305. The slurry port of the anchor seat 104 is located at one end of the upper corrugated pipe 200. The slurry port at the other end of the bellows 200 is connected to the slurry port at that end of the right bellows in the lower two bellows 400 through the connecting conduit 302, the slurry port at the other end of the right bellows is connected to the slurry port at that end of the middle bellows 300, the slurry port at the other end of the middle bellows 300 is connected to the slurry port at that end of the left bellows in the lower two bellows 400, the slurry port at the other end of the left bellows in the lower two bellows 400 is connected to the mixer 303 through the slurry outlet pipe 306, the mixer 303 is connected to the grouting machine 304 through the pump 202 and the pipeline, and the entire grouting equipment forms a circulating grouting.

[0016] The grouting cover 301 includes a steel casing 307, an end panel 308 and a sealing rubber pad 309. The outer end of the steel casing 307 is fixedly sealed and connected to the end panel 308. The end panel 308 is provided with two through holes 310. The two through holes 310 pass through two screws 311 to fix the grouting cover 301 to the anchor seat 104. The sealing rubber pad 309 is an annular structure with an annular groove 312 on one side. The sealing rubber pad 309 is sleeved on the end of the steel casing 307 through the annular groove 312. The parallel surface of the sealing rubber pad 309 is against the end face of the anchor 106 near the edge. The grouting cover of this structure is easy to assemble and disassemble, and utilizes the threaded holes on the existing anchor plate and is directly locked with screws. The connection is reliable and stable, and can withstand stable connection under high pressure. The addition of a sealing rubber pad can improve the sealing effect and avoid poor slurry pressurization stability caused by leakage.

[0017] During the grouting process in multiple corrugated pipes in the T-beam, a circulating grouting is formed, and a sealed and fixed grouting cover is set at the anchor to ensure that the entire grouting is carried out stably, avoiding the problems of poor grouting quality and unstable grouting pressure caused by leakage. The amount of slurry injected is 1.5 times the volume of the corrugated pipe, which can ensure sufficient grouting. The slurry is denser after solidification and the pipeline grouting is fuller. The use of high-strength and fast-hardening grouting materials can achieve rapid solidification, and the entire process greatly improves production efficiency.

[0018] The mixer includes an inner stirring shaft 224, a stirring sleeve 225, a lower stirring blade 226 and an upper stirring blade 227. The lower end of the stirring sleeve 225 is fixedly connected to a plurality of upper stirring blades 227. The plurality of upper stirring blades 227 are evenly arranged along the circumference of the lower end of the stirring sleeve 225. The inner stirring shaft 224 is rotatably connected to the stirring sleeve 225 and the lower end extends out of the stirring sleeve 225. The plurality of lower stirring blades 226 are connected to the stirring sleeve 225. The plurality of lower stirring blades 226 are evenly arranged along the circumference of the lower end of the inner stirring shaft 224. The lower stirring blade 226 and the upper stirring blade 227 are arranged at intervals. The upper end of the stirring sleeve 225 is rotatably connected to the support frame 228. The support frame 228 is rotatably connected to the top of the pulp storage tank 209 through a bearing. After the upper end is extended, a third gear 229 is fixedly connected. The second gear 230 engaged with the third gear 229 is fixedly connected to the drive shaft 231. The drive shaft 231 is rotatably connected to the top plate of the upper frame 232 through a bearing. The upper frame 232 is fixedly connected On the supporting frame 228, the first gear 233 meshing with the second gear 230 is fixedly connected to the motor shaft of the stirring motor 234, and the stirring motor 234 is inverted and fixedly connected to the top of the upper frame 232. The upper end of the driving shaft 231 extends out of the upper frame 232 and is fixedly connected to a crank 235. The other end of the crank 235 is hinged to one end of the connecting rod 236, and the other end of the connecting rod 236 is hinged to a hinge pin 238 on the rotating disk 237. The hinge pin 238 is arranged away from the center of the rotating disk 237. The middle part of the rotating disk 237 is fixedly connected to the end of the stirring sleeve 225 extending out of the upper frame 232. The stirring sleeve 225 and the upper frame 232 are rotatably connected through a bearing. The rotating disk 237, the crank 235, and the connecting rod 236 constitute a double crank mechanism. The installation method can ensure that the stirring sleeve and the inner stirring shaft rotate in opposite directions. The above-mentioned double stirring shaft and the arrangement of the stirring blades with opposite rotation directions make the stirring effect better and reduce the possibility of the stirring slurry solidifying under flow.

[0019] Furthermore, the operation method of the tensioning machine in the above step 2 is as follows: the tensioning sequence of the positive bending moment steel strands of the main beam is N2→N3→N4→N1; the tensioning sequence of the negative bending moment steel strands of the pier top is: T1 steel strand from inside to outside; the anchor adopts a clip-type anchor, and its tensioning procedure is 0→initial stress 10%σcon→initial stress 20%σcon→σcon, σcon holding load for 5 minutes; the tensioning rate is controlled at 10-25% / min of the tensioning control force, and the stable pressure holding time after reaching the control stress is not less than 5 minutes; when the jacks used in the tensioning machine are tensioned, the allowable error of the synchronous tensioning force between the left and right jacks and the two ends is controlled within ±2%; when tensioning to the control stress, the accuracy of the tensioning control stress is controlled within ±1.5%; prestressing When the force is tensioned to the design value, the error between the actual elongation and the theoretical elongation is controlled within ±6%; after tensioning is completed and the jack and tool anchor are removed, check whether the notches of each steel strand at the tool anchor are flush. If not, it means there is a slippage phenomenon, and the slippage should be supplemented to reach the control stress; the total number of broken and slipped wires in the entire beam shall not exceed 1.0% of the total number of steel wires in the section, and there shall not be more than 1 broken wire in a bundle, and they shall not be on the same side; if the entire bundle or a large number of wires are slipped and broken, the anchor head shall be removed, and the steel bundle shall be replaced after inspection and re-tensioning; the prestressed tendons shall be anchored after the tensioning control stress reaches stability; for clip-type anchors, the top surfaces of the clips shall be flush after anchoring, the mutual misalignment shall not be greater than 2mm, and the height exposed outside the anchor shall not be greater than 4mm.

[0020] The grouting equipment used in the grouting process includes an LJ-YJB1 circulating grouting system, a grouting cover 301 and a connecting conduit 302. The grouting cover 301 is fixedly sealed at the end of the anchor 106. The connecting conduit 302 uses multiple roots, each of which is connected to the slurry ports of two anchor seats 104. The slurry ports are connected to the inside of the bellows. The LJ-YJB1 circulating grouting system includes a mixer 303 and a grouting machine 304. The slurry outlet of the grouting machine 304 is connected to the slurry port of the anchor seat 104 through a slurry inlet pipe 305. The slurry port of the anchor seat 104 is located at one end of the upper bellows 200. The slurry port at the other end of the bellows 200 is connected to the slurry port at that end of the right bellows in the lower two bellows 400 through the connecting conduit 302, the slurry port at the other end of the right bellows is connected to the slurry port at that end of the middle bellows 300, the slurry port at the other end of the middle bellows 300 is connected to the slurry port at that end of the left bellows in the lower two bellows 400, the slurry port at the other end of the left bellows in the lower two bellows 400 is connected to the mixer 303 through the slurry outlet pipe 306, the mixer 303 is connected to the grouting machine 304 through the pump and the pipeline, and the entire grouting equipment forms a circulating grouting.

[0021] The grouting cover 301 includes a steel casing 307, an end panel 308 and a sealing rubber pad 309. The outer end of the steel casing 307 is fixedly sealed and connected to the end panel 308. The end panel 308 is provided with two through holes 310. The two through holes 310 pass through two screws 311 to fix the grouting cover 301 to the anchor seat 104. The sealing rubber pad 309 is an annular structure with an annular groove 312 on one side. The sealing rubber pad 309 is sleeved on the end of the steel casing 307 through the annular groove 312. The parallel surface of the sealing rubber pad 309 is against the end face of the anchor 106 near the edge. The grouting cover of this structure is easy to assemble and disassemble, and utilizes the threaded holes on the existing anchor plate and is directly locked with screws. The connection is reliable and stable, and can withstand stable connection under high pressure. The addition of a sealing rubber pad can improve the sealing effect and avoid poor slurry pressurization stability caused by leakage.

[0022] Furthermore, the above-mentioned duct grouting method steps are as follows:

[0023] 1) Anchorage sealing

[0024] Make a grouting cover according to the anchor model, and install the grouting cover and seal the anchor after the steel strand is cut;

[0025] 2) Slurry mixing

[0026] (1) Grouting equipment performance requirements

[0027] ① The grouting machine adopts the LJ-YJB1 circulating grouting system, which includes a high-speed grouting system, a grouting system, a control system and an automatic data acquisition system. The equipment should be able to automatically monitor and record the grouting process water-binder ratio, grouting pressure, stable pressure, stable time and grouting flow rate.

[0028] ② The speed of the mixer should not be less than 1000r / min, the shape of the stirring blade should match the speed, the linear speed of the blade should not be less than 10m / s and not more than 20m / s, and the mixing should be uniform within the specified time;

[0029] ③ The storage tank for temporary storage of slurry should have a stirring function, and the stirring speed should not exceed 500r / min; and a filter with a mesh size of no more than 3mm should be installed at the outlet of the storage tank;

[0030] ④ The volume of the mixer and slurry storage tank must be larger than the volume of the pipe bundle to be grouting. It is prohibited to add materials, stir and slurry at the same time;

[0031] ⑤ The grouting machine shall use a grouting pump that can operate continuously and can work at a constant pressure of more than 0.7 MPa. The minimum scale value of the pressure gauge shall not be greater than 0.1 MPa, and the maximum scale shall ensure that the actual working pressure is within the range of 25% to 75% of its scale. The pneumatic grouting pump shall not be used for grouting.

[0032] ⑥ In the event of an abnormality, the grouting machine has an automatic alarm function;

[0033] ⑦ The data protection function can effectively prevent construction personnel from modifying operating procedures or collected data. In the event of communication or equipment failure, emergency measures can be automatically taken to ensure data storage security.

[0034] ⑧ The water-cement ratio sensor, pressure sensor and flow sensor of the grouting machine should be verified or calibrated together with the high-speed grouting system, grouting system and control system as a whole. The verification or calibration cycle is 6 months;

[0035] (2) The performance indexes of post-tensioned prestressed duct grouting slurry are shown in the following table:

[0036]

[0037] (3) Slurry configuration

[0038] The grouting mix ratio is determined based on the laboratory test results. The materials used for grouting are weighed using automatic metering, with a metering error of less than ±1%. The design strength of the cement slurry is 50 MPa, and the slurry is prepared using Portland cement with a strength grade of 42.5 MPa.

[0039] Turn on the grouting trolley, first add 80% of the mixing water into the high-speed mixing barrel at a speed of 1000r / min, evenly add all the grouting agent, stir while adding, then evenly add all the cement, stir for 2 minutes after all the powder is added; then add the remaining 20% ​​of the mixing water and continue stirring for 2 minutes; then pass through the filter composed of a filter mesh with a mesh size of no more than 3×3mm set at the outlet of the high-speed mixing barrel into the storage tank and stir continuously, test the fluidity of the slurry for 10 to 17 seconds, and press it into the channel only after passing the test, and make 3 groups of test pieces. The time interval between the end of cement slurry mixing and pressing into the pipeline shall not exceed 40 minutes; the grouting pressure is 0.5~0.7Mpa; the filling degree of the grouting should be until the other end of the channel is full and the exhaust hole discharges cement slurry with the same fluidity as the specified; after closing the slurry outlet, it is advisable to maintain a stable pressure period of not less than 0.5MPa, and the maintenance time of this stable pressure period should be 3~5min;

[0040] 3) Intelligent grouting

[0041] The LJ-YJB1 circulating grouting system includes a system host, a measurement and control system, and a circulating grouting system. The slurry circulates continuously in a loop composed of prestressed pipes, a slurry making machine, and a grouting pump to exhaust the air in the pipe, promptly detect pipe blockage, and perform punching by increasing the pressure to discharge impurities and eliminate factors that lead to loose grouting. Precision pressure sensors are installed at the inlet and outlet of the pipe to monitor the pressure in real time, and provide real-time feedback to the system host for analysis and judgment. The measurement and control system adjusts the pressure according to the host's instructions to ensure that the prestressed pipe completes the grouting process under the constraints of the important indicators of slurry quality, pressure, and pressure stabilization time required by the construction technical specifications, ensuring that the grouting is full and dense. The system host judges the fullness of the pipe based on whether the pressure difference between the inlet and outlet remains constant within a certain period of time.

[0042] Furthermore, the hole is flushed before the above grouting, and the accumulated water in the hole is blown out with oil-free compressed air after flushing; the grouting is carried out slowly and evenly without interruption, and all the exhaust holes at the highest points are opened and closed one by one in sequence to ensure smooth exhaust in the hole, and the grouting of the same pipeline is carried out continuously and completed in one go; the prepared slurry is lower than 25°C, and cooling measures must be adopted during construction in high temperature seasons, or construction must be carried out in the morning or evening. The duration from the mixing of cement slurry to the injection into the hole shall not exceed 40 minutes, and the cement slurry shall remain in a fluid state before use and during the injection process. Cement slurry with reduced fluidity due to delayed use shall be used. , its fluidity shall not be increased by adding additional water; strengthen the cleaning and maintenance of grouting equipment, and there shall be no residue and water accumulation in the equipment after cleaning; during grouting operation, construction workers shall wear safety protection equipment correctly, grouting operators must wear protective glasses, and operators who transport cement and grouting agents shall wear protective masks; when grouting, each work team shall prepare and retain no less than 3 groups of test pieces with a size of 40mm×40mm×160mm, standard curing for 28d, and carry out compressive strength and flexural strength tests as the basis for quality assessment; after grouting, the grouting strength must reach 85% of the design strength when moving precast concrete components.

[0043] The above is only a specific implementation method of the present invention, but the scope of protection of the present invention is not limited to this. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A T-beam grouting device, characterized by: The invention comprises an LJ-YJB1 circulating grouting system, a grouting cover (301) and a connecting conduit (302). The grouting cover (301) is fixedly sealed at the end of the anchor (106). The connecting conduit (302) is provided with multiple tubes, each of which is connected to the slurry ports of two anchor seats (104). The slurry ports are communicated with the interior of the corrugated pipe. The LJ-YJB1 circulating grouting system comprises a mixer (303) and a grouting machine (304). The slurry outlet of the grouting machine (304) is connected to the slurry port of the anchor seat (104) through a slurry inlet pipe (305). The slurry port of the anchor seat (104) is located at the upper end of the corrugated pipe (200). The slurry port at the other end of the upper bellows (200) is connected to the slurry port at the end of the right bellows in the lower two bellows (400) through a connecting conduit (302), the slurry port at the other end of the right bellows is connected to the slurry port at the end of the middle bellows (300), the slurry port at the other end of the middle bellows (300) is connected to the slurry port at the end of the left bellows in the lower two bellows (400), the slurry port at the other end of the left bellows in the lower two bellows (400) is connected to the mixer (303) through a slurry outlet pipe (306), and the mixer (303) is connected to the grouting machine (304) through a pump and a pipeline.

2. A T-beam grouting device according to claim 1, characterized in that: The grouting cover (301) includes a steel casing (307), an end panel (308) and a sealing rubber pad (309). The outer end of the steel casing (307) is fixedly and sealedly connected to the end panel (308). The end panel (308) is provided with two through holes (310). The two through holes (310) pass through two screws (311) to fix the grouting cover (301) to the anchor seat (104). The sealing rubber pad (309) is an annular structure with an annular groove (312) provided on one side. The sealing rubber pad (309) is sleeved on the end of the steel casing (307) through the annular groove (312). The parallel surface of the sealing rubber pad (309) is against the end face of the anchor (106) near the edge.

3. The T-beam grouting device according to claim 1, characterized in that: The mixer (303) includes an inner stirring shaft (224), a stirring sleeve (225), a lower stirring blade (226), an upper stirring blade (227), and a slurry storage tank (209). The lower end of the stirring sleeve (225) is fixedly connected to a plurality of upper stirring blades (227). The plurality of upper stirring blades (227) are evenly arranged along the circumference of the lower end of the stirring sleeve (225). The inner stirring shaft (224) is rotatably connected to the stirring sleeve (225) and the lower end thereof extends out of the stirring sleeve (225) and is connected to a plurality of lower stirring blades. The mixing blades (226) are evenly arranged along the circumference of the lower end of the inner mixing shaft (224), and the lower mixing blades (226) and the upper mixing blades (227) are arranged at intervals. The upper end of the mixing sleeve (225) is rotatably connected to the support frame (228), and the support frame (228) is rotatably connected to the top of the pulp storage tank (209). The upper end extends out and is fixedly connected to a third gear (229). The second gear (230) meshing with the third gear (229) is fixedly connected to the drive shaft (209). The driving shaft (231) is rotatably connected to the top plate of the upper frame (232), the upper frame (232) is fixedly connected to the support frame (228), the first gear (233) meshing with the second gear (230) is fixedly connected to the motor shaft of the stirring motor (234), the stirring motor (234) is inverted and fixedly connected to the top of the upper frame (232), the upper end of the driving shaft (231) extends out of the upper frame (232) and is fixedly connected to the crank (235), the crank (23 5) The other end is hinged to one end of a connecting rod (236), and the other end of the connecting rod (236) is hinged to a hinge pin (238) on the rotating disk (237). The hinge pin (238) is arranged away from the center of the rotating disk (237). The middle of the rotating disk (237) is fixedly connected to the end of the stirring sleeve (225) extending out of the upper frame (232). The stirring sleeve (225) and the upper frame (232) are rotatably connected. The rotating disk (237), the crank (235), and the connecting rod (236) constitute a double crank mechanism.

Images