Movable milking device for sheep

By integrating a cleaning motor-driven composite cleaning component and a refrigeration unit, the problem of goat milk contamination and spoilage in traditional milking devices has been solved, enabling instant filtration and low-temperature storage of goat milk, thus improving the quality and safety of goat milk.

CN121003146APending Publication Date: 2025-11-25ANHUI AGRICULTURAL UNIVERSITY
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Patent Information

Application Number
CN202511360313.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-23
Publication Date
2025-11-25

AI Technical Summary

Technical Problem

Traditional milking equipment lacks immediate filtration and low-temperature storage capabilities, making goat milk susceptible to contamination and spoilage, thus affecting its quality and safety.

Method used

Design a mobile sheep milking device that integrates a cleaning motor-driven composite cleaning component and a refrigeration unit to achieve automatic cleaning of the filtration zone and instant cooling of the storage zone. Combined with a tethering chamber, a milking machine, a multi-layer filtration system, and a low-temperature storage system, it forms a fully mechanized operation.

Benefits of technology

It enables instant filtration and low-temperature storage of goat milk, preventing contamination by impurities and the growth of microorganisms, thus improving the freshness and hygiene of goat milk, and is suitable for mobile operations on farms.

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Abstract

The invention relates to the technical field of milking devices, and discloses a movable milking device for sheep, which comprises a movable vehicle body, a fixing bin and a filter box, the fixing bin and the filter box are mounted in the movable vehicle body, a tail plate is hinged to one side of the movable vehicle body, the fixing bin is mounted in the movable vehicle body, and a telescopic breast pump is arranged in the fixing bin. The other end of the breast pump is arranged at the top of the filtering box, the filtering box is composed of a filtering area and a storage area from top to bottom, a filtering piece is installed at the top of the filtering area and used for filtering goat milk conveyed by the breast pump and cleaning the filtering area, and a milk collecting barrel is placed in the storage area and used for receiving the filtered goat milk. By integrating the composite cleaning component driven by the cleaning motor, continuous and automatic jarring and scraping sweeping can be conducted on the filter plate in the milking process, filter holes are effectively prevented from being blocked, impurities are cleaned into the collecting drawer in real time, and the problem that secondary pollution is caused due to filtering delay and impurity retention of traditional equipment is solved.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of milking devices, in particular to a mobile milking device for sheep. BACKGROUND

[0002] In the field of animal husbandry, especially in the breeding of dairy goats and sheep, milking operation is one of the key links to achieve economic benefits. The core function of traditional milking devices, whether fixed milking hall or simple hand-pushed mobile equipment, is mainly concentrated on the mechanization and automation of milking operation, aiming to replace manual milking to improve efficiency and reduce labor intensity.

[0003] However, these traditional devices have a significant technical shortcoming: the lack of the ability to perform immediate on-site processing of the freshly squeezed milk, especially the crucial functions of immediate filtration and low-temperature storage. Generally, the working process of traditional milking devices is as follows: after the sheep are restrained, the sheep milk is squeezed out using a vacuum pulsation system, and the milk is collected into a milk collection tank or bucket through a pipeline. The problem lies in the subsequent collection and storage steps:

[0004] 1. Unable to achieve immediate and effective filtration: During the milking process, wool, skin debris, dust and other impurities can easily mix into the fresh milk. Traditional equipment often needs to filter the large amount of collected sheep milk uniformly after the milk collection tank is full, or even after all the sheep are milked. This delayed filtration allows impurities to soak in the sheep milk for too long, not only possibly expanding the contamination range, but also possibly increasing the initial contamination base of the sheep milk quality due to the microorganisms carried by the impurities.

[0005] 2. Lack of integrated low-temperature preservation system: Sheep milk is rich in nutrients and is an ideal culture medium for microorganisms. The temperature of freshly squeezed milk is about 35°C, which is suitable for rapid growth and reproduction of microorganisms. The milk collection tank used by traditional milking devices is usually only an ordinary insulation bucket or stainless steel bucket, which does not have an active refrigeration function. During the entire milking batch (which may take several hours), the sheep milk squeezed out first is at ambient temperature for a long time, and its temperature slowly decreases, providing a time window for the proliferation of bacteria.

[0006] The direct consequence is that sheep milk can easily deteriorate rapidly due to temperature rise and long storage time, showing increased acidity, deteriorated flavor, and even coagulation and corruption. This not only seriously affects the sensory quality and hygiene safety indicators of sheep milk, causing it to fail to meet the purchase standards of dairy plants and resulting in economic losses, but also greatly limits the ability of remote areas or small-scale farms to produce high-quality raw milk.

[0007] Therefore, the industry urgently needs a mobile sheep milking device which not only can complete the basic milking operation, but also can integrate instant filtering and on-site low-temperature cooling storage functions, to ensure the freshness and safety of sheep milk from the source and break through the technical bottleneck of traditional equipment. SUMMARY

[0008] To solve the technical problems of the existing milking device in the background art that immediate effective filtering cannot be achieved and an integrated low-temperature preservation system is lacking, the present application provides a mobile sheep milking device.

[0009] The present application adopts the following technical scheme: a mobile sheep milking device, comprising a mobile vehicle body and a restraining bin and a filter box installed in the mobile vehicle body, a tailgate hinged to one side of the mobile vehicle body, the restraining bin being installed in the mobile vehicle body, a retractable breast pump being arranged in the restraining bin, the other end of the breast pump being arranged at the top of the filter box;

[0010] The filter box is composed of a filtering area and a storage area from top to bottom, a filter element being installed at the top of the filtering area for filtering the sheep milk delivered by the breast pump and cleaning the filtering area, a milk collection bucket being placed in the storage area for receiving the filtered sheep milk.

[0011] As a further improvement of the above-mentioned scheme, two clamping arms are symmetrically fixedly connected in the restraining bin, and two groups of electric push rods are respectively connected to the outer sides of the two clamping arms.

[0012] As a further improvement of the above-mentioned scheme, the filter element comprises a filter plate placed at the top of the filter box, two sliding plates being symmetrically slidably connected to the two sides of the filter plate, a vertical sliding block being vertically slidably connected to the inner side of each sliding plate, a horizontal plate being horizontally slidably connected to the bottom end of each vertical sliding block, a plurality of knocking rods being uniformly fixedly connected to the bottom end of the horizontal plate, and a circular block being fixedly connected to the two sides of the horizontal plate.

[0013] As a further improvement of the above-mentioned scheme, a spring is connected between the top of the vertical sliding block and the middle of the sliding plate, and an abutment plate is fixedly connected to one side of the vertical sliding block.

[0014] As a further improvement of the above-mentioned scheme, a cleaning motor is fixedly connected to the outer wall of the filter box, a screw rod is connected to the output shaft of the cleaning motor through a shaft coupling, a threaded sleeve block is threadedly connected to the screw rod, the threaded sleeve block is fixedly connected to one side of the sliding plate, a rotating sleeve block is fixedly connected to the outer wall on the same side of the sliding plate, a cam is rotatably connected to one side of the rotating sleeve block, the outer side of the tread of the cam abuts against the bottom end of the abutment plate, and a ring block is fixedly connected to one side of the cam.

[0015] As a further improvement of the above-mentioned scheme, horizontal side notches are symmetrically formed in the two sides of the screw rod, and a side strip is slidably connected to the side notches, the side strip being fixedly connected to the inner wall of the ring block.

[0016] As a further improvement of the above-mentioned scheme, the vertical rod is vertically symmetrically and slidingly connected to one side of the sliding plate, and the bottom end of each vertical rod is fixedly connected to an inclined scraper, and the two vertical rods are fixedly connected to a sliding rod.

[0017] As a further improvement of the above-mentioned scheme, the inner wall of the filter plate is fixedly connected to a plurality of annular blocks at the same height on both sides, the annular blocks are intermittently abutted against the circular blocks during movement of the sliding plate, annular notches are formed in the inner wall of the filter plate on both sides, the annular notches are slidingly connected to the sliding rod, a discharge port is formed in one side of the filter plate, the discharge port is located in the inclined advancing direction of the scraper, and the connecting pipe is arranged above the filter plate and away from the discharge port.

[0018] As a further improvement of the above-mentioned scheme, the filter box is provided with a collection drawer on one side of the outer wall of the discharge port, and the filter box is fixedly connected to a filter inclined plate and a funnel in the filter area from top to bottom.

[0019] As a further improvement of the above-mentioned scheme, the filter box is hingedly connected to a box door on the outside of the storage area, and the filter box is symmetrically provided with refrigerators on the inner walls of the storage area.

[0020] Compared with the prior art, the beneficial effects of the present application are:

[0021] (1) The present application integrates a composite cleaning component driven by a cleaning motor, which can continuously and automatically shock and sweep the filter plate during milking, effectively preventing filter hole blockage and cleaning impurities into the collection drawer in real time, solving the problem of secondary pollution caused by traditional equipment filtering delay and impurity retention.

[0022] (2) The present application symmetrically arranges refrigerators on both sides of the storage area wall, which can immediately and actively cool the sheep milk collected in the milk collection barrel, effectively inhibiting the reproduction of microorganisms, ensuring that the sheep milk from the first sheep to the last sheep is in a low-temperature fresh-keeping state, and overcoming the defect that the traditional equipment lacks refrigeration function and the sheep milk is prone to spoilage.

[0023] (3) The present application highly integrates the holding bin, the milk suction device, the multi-layer filtering system, and the low-temperature storage system on a mobile vehicle body, realizing full mechanized operation from sheep holding, milking, filtering to refrigeration, and is especially suitable for mobile operation scenes in pastures and pastoral areas, significantly improving production efficiency and raw milk quality. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The present application provides a mobile sheep milking device, and a schematic diagram of the overall structure of the mobile sheep milking device is shown in the figure.

[0025] Figure 2 The present application Figure 1 is a top view schematic diagram.

[0026] Figure 3 for the present application Figure 2 for the present application

[0027] Figure 4 for the present application Figure 2 for the present application

[0028] Figure 5 for the present application

[0029] Figure 6 for the present application Figure 5 for the present application

[0030] Figure 7 for the present application

[0031] Figure 8 for the present application

[0032] Figure 9 for the present application

[0033] Figure 10 for the present application Figure 9 for the present application

[0034] Main symbol explanation:

[0035] 1, mobile vehicle body; 11, tail plate; 2, fixing bin; 21, clamping arm; 22, breast pump; 23, connecting pipe; 3, filter box; 31, hopper; 32, refrigeration; 33, milk collection barrel; 34, box door; 35, filter plate; 36, annular block; 37, annular notch; 38, discharge port; 39, collection drawer; 310, sliding plate; 311, vertical sliding block; 312, cross plate; 313, knocking rod; 314, spring; 315, vertical rod; 316, scraper; 317, sliding rod; 318, threaded sleeve block; 319, rotating sleeve block; 320, ring block; 321, cam; 322, side strip; 323, abutment plate; 324, cleaning motor; 325, screw rod; 326, side notch; 327, round block; 328, filter inclined plate; 329, vertical groove; 330, inclined groove. DETAILED DESCRIPTION

[0036] In the following, the present application will be further described in conjunction with the drawings and specific embodiments, it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0037] Embodiment: please combine Figures 1-10The embodiment of the application discloses a mobile sheep milking device.

[0038] The mobile trolley body 1 is hingedly connected with a tail plate 11 at one side, and the restraining bin 2 is arranged in the mobile trolley body 1. The milking device further comprises a filtering box 3 arranged in the mobile trolley body 1.

[0039] The filtering box 3 is composed of a filtering area and a storage area from top to bottom. The filtering area is provided with a filtering piece at the top, which is used for filtering the sheep milk delivered by the milking device 22 and cleaning the filtering area. The storage area is provided with a milk collecting barrel 33, which is used for receiving the filtered sheep milk.

[0040] Referring to Figure 1 , Figure 3 , Figure 5 and Figure 6 , the sheep can enter the restraining bin 2 through the tail plate 11 and walk out of the other side. The whole mobile trolley body 1 is arranged in such a way that the sheep enters the restraining bin 2 from the tail end. The front end of the mobile trolley body 1 can be connected with a traction mechanism, which includes but is not limited to an electric vehicle. The milking device 22 can be automatically controlled to stretch and retract to fit the belly of the sheep and facilitate the milking device 22 to suck the milk. Specifically, the milking device 22 can be a combination of a motor and a vacuum pump to realize the transportation of the sheep milk. The filtering area can filter the sheep milk and remove the impurities such as wool mixed in the sheep milk, and guide the filtered sheep milk into the storage area.

[0041] Specifically, the mobile trolley body 1 is provided with two groups of moving wheels at the bottom end, and a traction support is arranged at the front end of the mobile trolley body 1 and can be connected with the traction mechanism.

[0042] The restraining bin 2 is fixedly connected with clamping arms 21 in a symmetrical manner, and the two clamping arms 21 are respectively connected with two groups of electric push rods.

[0043] Referring to Figure 3 , a camera is arranged in the restraining bin 2 and can observe the environment in the restraining bin 2. The two groups of electric push rods are respectively arranged at the outer sides of the clamping arms 21 and cooperate with the camera to drive the clamping arms 21 to move inward and vertically, so as to restrain the sheep.

[0044] The filtering piece comprises a filtering plate 35 arranged at the top of the filtering box 3. The two sides of the filtering plate 35 are symmetrically and slidably connected with sliding plates 310. The inner sides of the sliding plates 310 are vertically and slidably connected with vertical sliding blocks 311. The bottom ends of the vertical sliding blocks 311 are horizontally and slidably connected with horizontal plates 312. The bottom ends of the horizontal plates 312 are uniformly and fixedly connected with a plurality of knocking rods 313. The two sides of the horizontal plates 312 are fixedly connected with circular blocks 327. The top of the vertical sliding block 311 is connected with a spring 314 at the middle of the sliding plate 310. One side of the vertical sliding block 311 is fixedly connected with an abutting plate 323.

[0045] Referring to Figure 5 , Figure 6 and Figure 8 , the sliding plate 310 can slide along the length direction of the filter plate 35, and after sliding, the knocking rod 313 can be pushed by the spring 314 to knock the bottom end of the filter plate 35, so as to facilitate the garbage at the filter plate 35 to be shaken out. The horizontal plate 312 slides at the bottom end of the vertical sliding block 311, which is beneficial to the intermittent horizontal displacement change of the knocking rod 313 with the movement of the sliding plate 310, so as to improve the all-round knocking and cleaning of the knocking rod 313 on the filter plate 35.

[0046] The outer wall of the filter box 3 is fixedly connected with a cleaning motor 324. The output shaft of the cleaning motor 324 is connected with a screw rod 325 through a shaft coupling. The screw rod 325 is threadedly connected with a threaded sleeve block 318. The threaded sleeve block 318 is fixedly connected with one side of the sliding plate 310. The outer wall of the same side of the sliding plate 310 is fixedly connected with a rotating sleeve block 319. The rotating sleeve block 319 is rotatably connected with a cam 321 on one side. The outer side of the tread of the cam 321 abuts against the bottom end of an abutting plate 323. The cam 321 is fixedly connected with a ring block 320 on one side. The screw rod 325 is symmetrically provided with horizontal side notches 326 on both sides. The side notches 326 are slidably connected with side strips 322. The side strips 322 are fixedly connected with the inner wall of the ring block 320.

[0047] Referring to Figure 5 , Figure 6 , Figure 8 , Figure 9 and Figure 10 , through the fixedly connected cleaning motor 324, the threaded sleeve block 318 threadedly connected with the screw rod 325 can drive the whole sliding plate 310 to reciprocatingly slide, so as to provide driving force for the whole sliding plate 310. The side notches 326 are slidably connected with the side strips 322, and the side strips 322 are fixedly connected with the inner wall of the ring block 320, so that the rotation of the cam 321 can be guaranteed when the sliding plate 310 slides. The abutting plate 323 can be driven to slide by the cam 321, so that the whole knocking rod 313 can be intermittently driven to knock the filter plate 35. The threaded sleeve block 318 and the rotating sleeve block 319 can be quickly disassembled and assembled through bolts, so as to facilitate the installation and maintenance of the whole sliding plate 310.

[0048] The sliding plate 310 is vertically and symmetrically connected with vertical rods 315 on one side. The bottom ends of the two vertical rods 315 are fixedly connected with inclined scrapers 316. The two vertical rods 315 are fixedly connected with sliding rods 317.

[0049] Referring to Figure 9 , the scraper 316 can abut against the bottom end of the filter plate 35 and clean the excess impurities outside, so as to facilitate the disposal.

[0050] A plurality of annular blocks 36 are fixedly connected at the same height on both sides of the inner wall of the filter plate 35, the annular blocks 36 are intermittently abutted against the circular block 327 when the sliding plate 310 moves, annular notches 37 are formed on both sides of the inner wall of the filter plate 35 and are in sliding connection with the sliding rod 317, a discharge port 38 is formed on one side of the filter plate 35 and is located in the inclined advancing direction of the scraper 316, and the connecting pipe 23 is arranged above the filter plate 35 and away from the discharge port 38.

[0051] Referring to Figure 5 , Figure 9 and Figure 10 , the sliding connection of the annular notches 37 and the sliding rod 317 can ensure that the scraper 316 is abutted against the bottom end of the filter plate 35 when the sliding plate 310 moves towards the discharge port 38, and when the sliding plate 310 returns, the sliding rod 317 will drive the entire scraper 316 to move upwards along the annular notches 37, avoiding the return of impurities to the filter plate 35. When the annular blocks 36 slide with the sliding plate 310, they can be intermittently abutted against the circular block 327, which can push the entire horizontal plate 312 to reciprocally slide, thereby improving the coverage range when the knocking rod 313 knocks.

[0052] A collection drawer 39 is mounted on one side of the outer wall of the filter box 3 located at the discharge port 38, and a filter inclined plate 328 and a funnel 31 are fixedly connected in the filter area of the filter box 3 from top to bottom.

[0053] Referring to Figure 6 and Figure 7 , after the preliminary filtration by the filter plate 35, the goat milk enters the inclined filter inclined plate 328, realizing that the goat milk can finally enter the sieve hole through the vertical groove 329 and the inclined groove 330 for secondary filtration. The filter inclined plate 328 can also be quickly removed in the later stage, and can also be directly cleaned and flushed to ensure the quality of the goat milk.

[0054] A box door 34 is hingedly connected to the filter box 3 located in the storage area, and a refrigeration device 32 is symmetrically arranged on both sides of the inner wall of the filter box 3 located in the storage area.

[0055] Referring to Figure 5 and Figure 6 , the box door 34 and the filter box 3 can be magnetically connected, and a sealing rubber ring is arranged at the connection to ensure the sealing property of the inside of the box door 34 when it is closed.

[0056] The implementation principle of the mobile goat milking device in the embodiment of the application is as follows:

[0057] After the mobile car body 1 is moved to the designated position, the lower tail plate 11 is placed and stably contacted with the ground, and then the sheep are driven to enter the holding warehouse 2 along the tail plate 11 in sequence, the camera detects and then drives the two clamping arms 21 to hold the sheep, and then the driven breast pump 22 is moved to the position for collecting milk, and the breast pump 22 is started to collect the sheep milk along the connecting pipe 23 into the filter plate 35.

[0058] The cleaning motor 324 is started to drive the entire side slot 326 to stably rotate in one direction, the entire slide plate 310 is driven to slide along the filter plate 35 by the threaded connection of the screw rod 325 and the threaded sleeve block 318, the cam 321 intermittently pushes the abutment plate 323 to drive the vertical sliding block 311 to lift up when the slide plate 310 slides, and the spring 314 elastically pushes the knocking rod 313 to elastically knock on the filter plate 35.

[0059] When the slide plate 310 slides, the circular block 327 and the annular block 36 can be slid and connected, and the horizontal plate 312 can be periodically reciprocatingly slid.

[0060] When the slide plate 310 slides along the filter plate 35 to the collection drawer 39 area, the scraper 316 will slide along the bottom of the annular groove 37, and push the impurities to the collection drawer 39, and slide along the upper end of the annular groove 37 on the way back, so as to avoid the abutment of the scraper 316 on the filter plate 35.

[0061] The sheep milk enters the milk collection barrel 33 placed at the bottom end of the filter box 3 along the funnel 31, and the temperature of the storage area is guaranteed by the two side refrigerators 32.

[0062] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the scope of protection of the present application, and any non-essential changes and replacements made by those skilled in the art on the basis of the present application are within the scope of protection of the present application.

Claims

1. A mobile sheep milking device, comprising a mobile vehicle body (1), a restraining bin (2) and a filter box (3) installed in the mobile vehicle body (1), characterized in that: a tailgate (11) is hingedly connected to one side of the mobile vehicle body (1), the restraining bin (2) is installed in the mobile vehicle body (1), a retractable breast pump (22) is arranged in the restraining bin (2), and the other end of the breast pump (22) is arranged at the top of the filter box (3); wherein the filter box (3) is composed of a filter area and a storage area from top to bottom, a filter element is installed at the top of the filter area for filtering the sheep milk delivered by the breast pump (22) and cleaning the filter area, and a milk collection bucket (33) is placed in the storage area for receiving the filtered sheep milk.

2. A mobile sheep milking apparatus as claimed in claim 1 wherein, The restraining bin (2) is fixedly connected with two clamping arms (21) symmetrically, and two groups of electric push rods are connected to the outer sides of the two clamping arms (21), respectively.

3. A mobile sheep milking apparatus as claimed in claim 1 wherein, The filter element comprises a filter plate (35) placed at the top of the filter box (3), two slide plates (310) are symmetrically and slidably connected to the two sides of the filter plate (35), vertical slide blocks (311) are vertically and slidably connected to the inner sides of the slide plates (310), horizontal plates (312) are horizontally and slidably connected to the bottom ends of the vertical slide blocks (311), a plurality of knocking rods (313) are uniformly and fixedly connected to the bottom ends of the horizontal plates (312), and circular blocks (327) are fixedly connected to the two sides of the horizontal plates (312).

4. A mobile sheep milking apparatus as claimed in claim 3 wherein, A spring (314) is connected to the top of the vertical slide block (311) and the middle of the slide plate (310), and an abutment plate (323) is fixedly connected to one side of the vertical slide block (311).

5. A mobile sheep milking apparatus as claimed in claim 3 wherein, A cleaning motor (324) is fixedly connected to the outer wall of the filter box (3), a screw rod (325) is connected to the output shaft of the cleaning motor (324) through a shaft coupling, a threaded sleeve block (318) is threadedly connected to the screw rod (325), the threaded sleeve block (318) is fixedly connected to one side of the slide plate (310), a rotating sleeve block (319) is fixedly connected to the outer wall of the same side of the slide plate (310), a cam (321) is rotatably connected to one side of the rotating sleeve block (319), the outer side of the tread of the cam (321) abuts against the bottom end of the abutment plate (323), and a ring block (320) is fixedly connected to one side of the cam (321).

6. A mobile sheep milking apparatus as claimed in claim 5 wherein, Symmetrical horizontal side notches (326) are formed in the two sides of the screw rod (325), and side strips (322) are slidably connected to the side notches (326).

7. A mobile sheep milking apparatus as claimed in claim 5 wherein, A vertical rod (315) is vertically and slidably connected to one side of the slide plate (310), inclined scraper plates (316) are fixedly connected to the bottom ends of the two vertical rods (315), and a slide rod (317) is fixedly connected at the positions of the two vertical rods (315).

8. A mobile sheep milking apparatus as claimed in claim 3 wherein, The inner wall of the filter plate (35) is fixedly connected with a plurality of annular blocks (36) at the same height on both sides, the annular blocks (36) are intermittently in contact with the circular block (327) when the sliding plate (310) moves, the inner wall of the filter plate (35) is provided with an annular notch (37) on both sides, the annular notch (37) is slidably connected with the sliding rod (317), the filter plate (35) is provided with a discharge port (38) on one side, the discharge port (38) is located in the inclined advancing direction of the scraper (316), and the connecting pipe (23) is arranged above the filter plate (35) and away from the discharge port (38).

9. A mobile sheep milking apparatus as claimed in claim 3 wherein, The filter box (3) is provided with a collection drawer (39) on one side of the outer wall of the discharge port (38), and the filter box (3) is fixedly connected with a filter inclined plate (328) and a funnel (31) from top to bottom in the filtering area. The filter inclined plate (328) is inclined, and the filter inclined plate (328) is provided with a vertical groove (329) and an inclined groove (330) in sequence at the sieve hole.

10. A mobile sheep milking apparatus as claimed in claim 9 wherein, The filter box (3) is hingedly connected with a box door (34) outside the storage area, and the filter box (3) is symmetrically provided with a refrigeration device (32) on the inner wall of the storage area.

Citation Information

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