CN207206765U - A kind of concrete mixer and its material-pouring device - Google Patents

A kind of concrete mixer and its material-pouring device Download PDF

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Publication number
CN207206765U
CN207206765U CN201721010258.5U CN201721010258U CN207206765U CN 207206765 U CN207206765 U CN 207206765U CN 201721010258 U CN201721010258 U CN 201721010258U CN 207206765 U CN207206765 U CN 207206765U
Authority
CN
China
Prior art keywords
batch turning
turning bucket
hole
containing portion
plug connector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201721010258.5U
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Chinese (zh)
Inventor
黄龙雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Mao Chun Construction Group Co Ltd
Original Assignee
Guangdong Mao Chun Construction Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Mao Chun Construction Group Co Ltd filed Critical Guangdong Mao Chun Construction Group Co Ltd
Priority to CN201721010258.5U priority Critical patent/CN207206765U/en
Application granted granted Critical
Publication of CN207206765U publication Critical patent/CN207206765U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

Concrete batch plant is the utility model is related to, more specifically, it relates to a kind of concrete mixer and its material-pouring device.Its drip irrigation device is:Including placing the support frame of batch turning bucket and being arranged at the pull rope for pulling batch turning bucket to rise on support frame, the pulling rope for pulling batch turning bucket to decline is connected with batch turning bucket;The batch turning bucket includes containing portion and the rotor plate being rotationally connected with containing portion, and rotor plate rotates the splendid attire thing realized and poured out in batch turning bucket away from containing portion;Batch turning bucket is provided with the limiter assembly that limitation rotor plate freely rotates;Mixer opening is provided with the trigger assembly for opening limiter assembly.It is placed on after cement or sandstone are installed in batch turning bucket on support frame, pulling traction rope drives batch turning bucket to rise, when reaching mixer opening, trigger assembly triggers limiter assembly, rotor plate is by the pressure rotary of batch turning inner bucket water mud or sandstone away from containing portion, cement and sandstone are fallen into mixer, complete batch turning.

Description

A kind of concrete mixer and its material-pouring device
Technical field
The utility model is related to concrete batch plant, more specifically, it relates to a kind of concrete mixer and its fall Expect device.
Background technology
Present concrete mixer used on the market, it is as one kind to be used to the auxiliary materials such as cement, sandstone and water mix Merge the building machinery for stirring into concrete mixture, be divided into vertical concrete stirring machine and horizontal concrete mixer, it is horizontal Concrete mixer price is high, and much especially rural construction teams are rarely employed from a cost perspective.Vertical concrete stirring Machine price is low, is welcome by many small building teams.But existing vertical concrete stirring machine is needed cement, sand manually Stone is chosen in the agitator of vertical concrete stirring machine, and labor intensity is very big.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model one is to provide a kind of material-pouring device, being capable of band The dynamic batch turning bucket rising for containing cement, sandstone, reduces labor intensity.
Above-mentioned technical purpose one of the present utility model technical scheme is that:A kind of material-pouring device, Including placing the support frame of batch turning bucket and being arranged at the pull rope for pulling batch turning bucket to rise on support frame, drawing is connected with batch turning bucket The pulling rope that dynamic batch turning bucket declines;The batch turning bucket includes containing portion and the rotor plate being rotationally connected with containing portion, rotor plate The splendid attire thing realized and poured out in batch turning bucket is rotated away from containing portion;Batch turning bucket is provided with the limitation group that limitation rotor plate freely rotates Part;Mixer opening is provided with the trigger assembly for opening limiter assembly.
It is placed on after cement or sandstone are installed in batch turning bucket on support frame, pulling traction rope drives batch turning bucket to rise, and arrives During up to mixer opening, trigger assembly triggers limiter assembly, and rotor plate is remote by the pressure rotary of batch turning inner bucket water mud or sandstone From containing portion, cement and sandstone are fallen into mixer, complete batch turning;Pull rope to pull batch turning bucket to decline, fed, whole mistake Journey is easy to operate, reduces working strength.
The utility model is further arranged to:Offered respectively at the rotor plate and containing portion rotation connection recovery hole and Limiting holes, the limiter assembly include the plug connector that can be located in simultaneously in recovery hole and limiting holes;The batch turning bottom of the barrel is set There is sliding to be connected to the impeller that plug connector can be released to limiting holes in limiting holes.
By using above-mentioned technical proposal, plug connector is inserted in recovery hole and limiting holes simultaneously, simple and effective can be limited Rotor plate processed freely rotates, and cost is low, is readily produced;Impeller promotes plug connector to skid off limiting holes and realizes turning for rotor plate It is dynamic, it is simple to operate, fast, improve efficiency of construction.
The utility model is further arranged to:The end that the plug connector stretches into recovery hole is connected with elastic component, the bullet Property part opposite other end is fixedly connected on the bottom of recovery hole;Elastic component is in stretching shape when plug connector part is stretched into limiting holes State;The elastic limited part that limitation plug connector free skating goes out limiting holes is provided with limiting holes;Promotion plug connector is additionally provided with batch turning bucket Into the movement parts of limiting holes.
By using above-mentioned technical proposal, elastic limited part limitation plug connector free skating goes out limiting holes, avoids filling as far as possible Plug connector skids off the situation of limiting holes rotor plate opening in material process or batch turning bucket uphill process, avoids wasting, and help In raising operating efficiency;After impeller promotes plug connector, elastic component recovers to pull plug connector to enter recovery hole, makes the fortune of plug connector Dynamic more smooth, batch turning bucket is easier to open rotor plate when moving to stirring machine inlet, pours out cement or sand;Movement parts push away Dynamic plug connector enters limiting holes, and operation is more convenient, not only reduces labor intensity, and further increase efficiency of construction.
The utility model is further arranged to:The motion hole connected with recovery hole, the fortune are offered on the rotor plate Moving part is located in motion hole and end vertical is arranged in recovery hole;The motion hole is arranged to L-type, and movement parts are in motion hole Interior movement progress or remote plug connector.
When needing movement parts promotion plug connector, insert in recovery hole from motion hole by movement parts, moved along hole pulling is moved Part, and then promote plug connector;When plug connector need not be promoted, movement parts are turned to the other end in L-type motion hole, away from grafting Part, the motion of plug connector will not be hindered, whole process is simple to operate, improves efficiency of construction.
The utility model is further arranged to:The impeller bottom is connected with the promotion platform being adapted to containing portion bottom, The block piece that limitation promotes platform motion to open rotor plate is movably set with containing portion.
Block piece limitation promotes platform motion to open rotor plate, avoids the promotion platform movement progress grafting during charging The situation that part skids off limiting holes rotor plate opening occurs, more smooth using process;Promote table top product relatively large, in mixer Trigger assembly at charging aperture is easier to promote plug connector to skid off limiting holes, and batch turning is more convenient, smooth, is advantageous to improve construction Efficiency.
The utility model is further arranged to:The promotion platform is provided with locating rod, and containing portion bottom offers slip and connected Connect the positioning hole of locating rod;Patchhole is offered in the side wall of positioning hole, locating rod offers through hole;The block piece activity is worn It is located in patchhole and through hole.
Locating rod is slidably connected in positioning hole, has good spacing and guide effect, promotes the direction of motion of platform not Deviation easily occurs, the trigger assembly at stirring machine inlet is easier to promote plug connector to skid off limiting holes, and batch turning is more square Just, smoothly;Block piece, which is located in patchhole and through hole, can be achieved the motion that limitation promotes platform, and simple in construction, cost is low, behaviour It is also convenient for fast, improving efficiency of construction.
The utility model is further arranged to:The trigger assembly includes the directing plate of connection stirring machine inlet and is located at The supports block of directing plate pushed upwards impeller.
By using above-mentioned technical proposal, directing plate has good Undertaking effect to batch turning bucket, while can also be good Guide cement, sand to enter in mixer, advantageously reduce waste, improve efficiency of construction;Supports block promotes impeller to realize and rotated The rotation of plate, batch turning is more convenient, reduces labor intensity.
The utility model is further arranged to:Guide rail is offered on support frame as described above, the batch turning bucket is provided with sliding The sliding block being connected in guide rail.
By using above-mentioned technical proposal, sliding block slides in guide rail, there is guiding and spacing work well to batch turning bucket With more steady in batch turning bucket uphill process, it is not easy to spill cement, sand, reduce and waste, and be advantageous to improve construction effect Rate.
The utility model is further arranged to:Guide rail bottom offers the removal hole for skidding off sliding block.
By using above-mentioned technical proposal, removal hole realizes the dismantled and assembled use of batch turning bucket, first can put batch turning bucket Put and fed by cement, sand heap, use is more flexible, charging, batch turning can be used alternatingly with multiple batch turning buckets, can be with Part-time is saved, is advantageous to improve efficiency of construction.
The purpose of this utility model two is to provide a kind of concrete mixer, has to drive and contains cement, sandstone Batch turning bucket rise material-pouring device, reduce labor intensity.
Above-mentioned technical purpose two of the present utility model technical scheme is that:A kind of concrete stirring Machine, including the mixer of ready-mixed concrete and the material-pouring device into mixer described in the such scheme of batch turning.
By using the material-pouring device in such scheme, labor intensity can be greatly reduced, improves efficiency of construction, favorably In popularization.
In summary, the utility model has the advantages that:
It is placed on after cement or sandstone are installed in batch turning bucket on support frame, pulling traction rope drives batch turning bucket to rise, and arrives During up to mixer opening, trigger assembly triggers limiter assembly, and rotor plate is remote by the pressure rotary of batch turning inner bucket water mud or sandstone From containing portion, cement and sandstone are fallen into mixer, complete batch turning;Pull rope to pull batch turning bucket to decline, fed, whole mistake Journey is easy to operate, greatly reduces working strength.
Impeller, plug connector, block piece etc. are simple in construction, and cost is low, easily operated, when all further saving construction Between, improve efficiency of construction.
Brief description of the drawings
Fig. 1 is the overall structure figure of concrete mixer;
Fig. 2 is the attachment structure schematic diagram of batch turning bucket and support frame in material-pouring device;
Fig. 3 is Fig. 2 A portions enlarged diagram;
Fig. 4 is the internal structure schematic diagram of batch turning bucket in material-pouring device;
Fig. 5 is Fig. 4 B portions enlarged diagram.
In figure:1st, support frame;11st, pole;111st, pulley yoke;12nd, fixed pulley;13rd, pull rope;131st, link up with;14th, guide Rail;141st, removal hole;2nd, axle is declined;21st, handle is declined;22nd, rope is pulled;3rd, directing plate;31st, supports block;4th, mixer;5th, batch turning Bucket;51st, containing portion;511st, sliding bar;512nd, sliding block;513rd, block piece;514th, positioning hole;515th, the first patchhole;516th, Two patchholes;52nd, link;53rd, rotor plate;531st, recovery hole;532nd, limiting holes;533rd, plug connector;534th, elastic component;535th, block Socket part;536th, elastic limited part;54th, platform is promoted;541st, impeller;542nd, locating rod;5421st, through hole;55th, bellows;56th, cut with scissors Spindle;561st, hole is moved;562nd, movement parts;57th, suspension ring;6th, elevating shaft;61st, handle is risen.
Embodiment
Fig. 1-Fig. 5 and embodiment in below in conjunction with the accompanying drawings, the utility model is described in detail.
A kind of concrete mixer, as shown in figure 1, falling the batch turning of sand-cement including mixer 4 and to the introversion of mixer 4 Device.
A kind of material-pouring device, as shown in figure 1, being pulled including placing the support frame 1 of batch turning bucket 5 and being arranged on support frame 1 The pull rope 13 that batch turning bucket 5 rises, the pulling rope 22 for pulling batch turning bucket 5 to decline is connected with batch turning bucket 5;Batch turning bucket 5 includes containing Dress portion 51 and the rotor plate 53 being rotationally connected with containing portion 51, rotor plate 53 rotate realization away from containing portion 51 and pour out batch turning bucket Splendid attire thing in 5 (referring to Fig. 4 and Fig. 5);Batch turning bucket 5 is provided with the limiter assembly that limitation rotor plate 53 freely rotates;Mixer 4 Opening is provided with the trigger assembly for opening limiter assembly.
As shown in figure 1, support frame 1 sets and extended up at the charge door of mixer 4 perpendicular to ground, and contradict stirring It is integrally formed the oriented inclined directing plate 3 of the charge door of mixer 4 at the charge door of machine 4, integrally formed with supports block 31 on directing plate 3, Supports block 31 and directing plate 3 form trigger assembly in the present embodiment.
The top both ends of support frame 1 are also welded with two poles 11 perpendicular to ground, and two poles 11 are revolved parallel to ground Turn to be plugged with pulley yoke 111, two fixed pulleys 12 are fixed with pulley yoke 111, the one end of pull rope 13 is hooked on batch turning bucket 5, worn Fixed pulley 12 is crossed, opposite other end is wrapped on the elevating shaft 6 for being fixed on ground, is provided with elevating shaft 6 and is driven 6 turns of elevating shaft Dynamic rising handle 61.
Pass through suspension ring 57 on batch turning bucket 5(Referring to Fig. 4)It is also associated with pulling rope 22, pulls 22 opposite other end of rope to be wrapped in It is fixed on the decline axle 2 on ground, declining axle 2 and support frame 1 has a certain distance, and declines and drive rising is provided with axle 2 The decline handle 21 that axle 6 rotates.
As shown in Figures 2 and 3, guide rail 14 is offered on support frame 1, guide rail 14 extends to support frame perpendicular to ground 1 top, and the cross section of guide rail 14 is swallow-tail form, guide rail 14 offers removal hole 141 close to the bottom on ground;Batch turning bucket Four sliding bars 511 are welded with 5 side walls, four Relative distributions of sliding bar 511 are in the side wall both sides of batch turning bucket 5, and perpendicular to drawing The length direction of guide rail 14;Sliding bar 511 is also welded with the sliding block 512 of swallow-tail form close to one end of guide rail 14, and sliding block 512 can Guide rail 14 is slid in or out from removal hole 141 and is slided in guide rail 14.
The top of batch turning bucket 5 is also welded with link 52, is the hook 131 for having and hooking link 52 on pull rope 13.
As shown in Figure 4 and Figure 5, jointed shaft 56 is welded with rotor plate 53 and the rotation connection of containing portion 51, realizes rotor plate 53 and containing portion 51 be articulated and connected;Rotor plate 53 and the place of being articulated and connected of containing portion 51 offer recovery hole 531 and limitation respectively Hole 532, limiter assembly sliding are connected in recovery hole 531 and limiting holes 532, and limiter assembly includes that recovery hole can be located in simultaneously 531 and limiting holes 532 in plug connector 533, the end that plug connector 533 stretches into recovery hole 531 is connected with elastic component 534, this reality Apply elastic component 534 in example and use spring, the opposite other end of elastic component 534 is welded in the bottom of recovery hole 531, plug connector 533 Point stretching into elastic component 534 when in limiting holes 532 is in extended state;The one end of plug connector 533 away from elastic component 534 is integrally formed There is the Access Division 535 that diameter is more than plug connector 533, be welded with limiting holes 532 and contradict the limitation of Access Division 535 plug connector 533 certainly By skidding off the elastic limited part 536 of limiting holes 532, also slidably connected in limiting holes 532 and plug connector 533 is released into limiting holes 532 impeller 541.
The L-type motion hole 561 connected with recovery hole 531 is offered on rotor plate 53, activity in hole 561 of moving is equipped with fortune Moving part 562, the end vertical of movement parts 562 are arranged in recovery hole 531, the movement progress or remote in motion hole 561 of movement parts 562 From plug connector 533, it can not only promote plug connector 533 to enter limiting holes 532 but also plug connector 533 will not be hindered to slip into recovery hole 531.
Movement parts 562 are inserted in recovery hole 531 from motion hole 561, pull movement parts 562 along hole 561 is moved, and then push away Dynamic plug connector 533;When plug connector 533 need not be promoted, movement parts 562 are turned to the upper end in L-type motion hole 561, away from slotting Fitting 533, the motion of plug connector 533 will not be hindered, whole process is simple to operate, improves efficiency of construction.
The bottom of impeller 541 is connected with the post frustum being adapted to the bottom of containing portion 51 and promotes platform 54, promotes phase on platform 54 Locating rod 542 is welded with to the side of impeller 541, the top of locating rod 542 offers through hole 5421, and the bottom of containing portion 51 opens up There is the positioning hole 514 for the locating rod 542 that is slidably connected;Patchhole is offered in the side wall of positioning hole 514, patchhole includes being opened in The first patchhole 515 on the lateral wall of containing portion 51 and being opened in the side wall of positioning hole 514 is oppositely arranged with the first patchhole 515 The second patchhole 516;Activity is equipped with block piece 513 in patchhole and through hole 5421, and limitation promotes the motion opening of platform 54 to turn Dynamic plate 53.Promote and be also welded with bellows 55 between platform 54 and the bottom of containing portion 51.
Use step:First confirm that the block piece 513 of batch turning bucket 5 is located in patchhole and through hole 5421, plug connector 533 Access Division 535 is connected in limiting holes 532, cement or sand is added into batch turning bucket 5, after filling sand, by the cunning of batch turning bucket 5 Block 512 slips into guide rail 14 from removal hole 141, and hook 131 is hung on link 52, and fastens pulling rope 22, extracts block piece 513 and movement parts 562, rotation rises handle 61, and pull rope 13 drives batch turning bucket 5 to rise, after reaching the top of directing plate 3, revolution Rise handle 61, batch turning bucket 5 contradicts directing plate 3 under gravity, the supports block 31 on directing plate 3 promote promotion platform 54 and then Promoting plug connector 533, elastic component 534 recovers to drive plug connector 533 to stretch into recovery hole 531, rotor plate 53 away from limiting holes 532 The Unscrew under the pressure of cement or sand, and then cement or sand fall into the charging aperture of mixer 4.Cement or sand have been toppled over Bi Hou, rotate and decline handle 21, batch turning bucket 5 is slided, remove hook 131 and pull rope 22, by movement parts 562 by plug connector In 533 push-in limiting holes 532, and block piece 513 is inserted in patchhole and through hole 5421, slided from removal hole 141 by sliding block 512 Go out, remove batch turning bucket 5, fed, repeat aforesaid operations.
Described above is only preferred embodiment of the present utility model, and the scope of protection of the utility model is not limited merely to Above-described embodiment, all technical schemes belonged under the utility model thinking belong to the scope of protection of the utility model.It should refer to Go out, for those skilled in the art, some improvement under the premise of the utility model principle is not departed from and Retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.

Claims (10)

  1. A kind of 1. material-pouring device, it is characterised in that:Including placing the support frame (1) of batch turning bucket (5) and being arranged on support frame (1) The pull rope (13) of batch turning bucket (5) rising is pulled, the pulling rope (22) for pulling batch turning bucket (5) to decline is connected with batch turning bucket (5); The batch turning bucket (5) includes containing portion (51) and the rotor plate (53) being rotationally connected with containing portion (51), and rotor plate (53) is remote The splendid attire thing in batch turning bucket (5) is poured out from containing portion (51) rotation realization;Batch turning bucket (5) is provided with limitation rotor plate (53) freely The limiter assembly of rotation;Mixer (4) opening is provided with the trigger assembly for opening limiter assembly.
  2. A kind of 2. material-pouring device according to claim 1, it is characterised in that:The rotor plate (53) and containing portion (51) turn Dynamic junction offers recovery hole (531) and limiting holes (532) respectively, and the limiter assembly includes that recovery hole can be located in simultaneously (531) plug connector (533) and in limiting holes (532);Batch turning bucket (5) bottom is connected to limiting holes (532) provided with sliding The interior impeller (541) that plug connector (533) can be released to limiting holes (532).
  3. A kind of 3. material-pouring device according to claim 2, it is characterised in that:The plug connector (533) stretches into recovery hole (531) end is connected with elastic component (534), and elastic component (534) opposite other end is fixedly connected on recovery hole (531) Bottom;Plug connector (533) partly stretch into limiting holes (532) it is interior when elastic component (534) be in extended state;In limiting holes (532) Go out the elastic limited part (536) of limiting holes (532) provided with limitation plug connector (533) free skating;Batch turning bucket is additionally provided with promotion on (5) Plug connector (533) enters the movement parts (562) of limiting holes (532).
  4. A kind of 4. material-pouring device according to claim 3, it is characterised in that:Offer and recover on the rotor plate (53) Hole (531) connection motion hole (561), the movement parts (562) be located in motion hole (561) in and end vertical be arranged in it is extensive In multiple holes (531);Motion hole (561) is arranged to L-type, and movement parts (562) are in motion hole (561) interior movement progress or remote Plug connector (533).
  5. A kind of 5. material-pouring device according to claim 2, it is characterised in that:Impeller (541) bottom be connected with The promotion platform (54) of containing portion (51) bottom adaptation, limitation is movably set with containing portion (51) promotes platform (54) motion to open and turn The block piece (513) of dynamic plate (53).
  6. A kind of 6. material-pouring device according to claim 5, it is characterised in that:The promotion platform (54) is provided with locating rod (542), containing portion (51) bottom offers the positioning hole (514) of the locating rod that is slidably connected (542);The side wall of positioning hole (514) On offer patchhole, locating rod (542) offers through hole (5421);Block piece (513) activity be located in patchhole and In through hole (5421).
  7. A kind of 7. material-pouring device according to claim 2, it is characterised in that:The trigger assembly includes connection mixer (4) directing plate (3) of charging aperture and the supports block (31) located at directing plate (3) pushed upwards impeller (541).
  8. A kind of 8. material-pouring device according to claim 1, it is characterised in that:Support frame as described above offers guide rail on (1) (14), the batch turning bucket (5) is provided with the sliding block (512) that sliding is connected in guide rail (14).
  9. A kind of 9. material-pouring device according to claim 8, it is characterised in that:Guide rail (14) bottom, which offers, skids off sliding block (512) removal hole (141).
  10. 10. a kind of concrete mixer, including the mixer (4) of ready-mixed concrete and to mixer (4) interior batch turning such as right It is required that the material-pouring device in 1-9 described in any one.
CN201721010258.5U 2017-08-11 2017-08-11 A kind of concrete mixer and its material-pouring device Expired - Fee Related CN207206765U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201721010258.5U CN207206765U (en) 2017-08-11 2017-08-11 A kind of concrete mixer and its material-pouring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201721010258.5U CN207206765U (en) 2017-08-11 2017-08-11 A kind of concrete mixer and its material-pouring device

Publications (1)

Publication Number Publication Date
CN207206765U true CN207206765U (en) 2018-04-10

Family

ID=61818878

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201721010258.5U Expired - Fee Related CN207206765U (en) 2017-08-11 2017-08-11 A kind of concrete mixer and its material-pouring device

Country Status (1)

Country Link
CN (1) CN207206765U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108868142A (en) * 2018-06-19 2018-11-23 隆生国际建设集团有限公司 A kind of confined space concrete casting device and construction method
CN116277512A (en) * 2023-03-10 2023-06-23 江苏泰高建设有限公司 Building mortar manufacturing equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108868142A (en) * 2018-06-19 2018-11-23 隆生国际建设集团有限公司 A kind of confined space concrete casting device and construction method
CN108868142B (en) * 2018-06-19 2020-08-04 隆生国际建设集团有限公司 Closed space concrete pouring device and construction method
CN116277512A (en) * 2023-03-10 2023-06-23 江苏泰高建设有限公司 Building mortar manufacturing equipment
CN116277512B (en) * 2023-03-10 2023-11-24 江苏泰高建设有限公司 Building mortar manufacturing equipment

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20180410

Termination date: 20190811

CF01 Termination of patent right due to non-payment of annual fee