Multi-path grease mixing and adding all-in-one machine

By using an oil metering scale, heating plate, and spray atomization mechanism in a multi-channel oil mixing and adding machine, the problem of increased molasses viscosity in low-temperature environments was solved, achieving stable operation and efficient production of the equipment, and ensuring the uniformity of spraying and the stability of product quality.

CN223901633UActive Publication Date: 2026-02-13NANNING NANLING IND TECH
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Patent Information

Application Number
CN202520493476.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-20
Publication Date
2026-02-13
Estimated Expiration
2035-03-20

AI Technical Summary

Technical Problem

Traditional multi-channel oil mixing and adding integrated machines suffer from increased molasses viscosity at low temperatures, leading to pipe blockage, nozzle clogging, and deviations in dispensing accuracy. Furthermore, the equipment's control panel is prone to dust accumulation, causing malfunctions and safety hazards.

Method used

The grease is preheated using a grease metering scale, heating plate, and temperature sensor. Combined with a spray atomization mechanism and a cleaning mechanism, this ensures the molasses flowability and uniform spraying. An embedded control panel and a sliding rail cleaning mechanism are also designed to prevent dust accumulation on the equipment.

Benefits of technology

It effectively avoids pipeline blockage and material deviation, improves production efficiency and product quality consistency, and reduces equipment failure and maintenance costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a multi-path grease mixing and adding all-in-one machine, and relates to the technical field of food processing, the multi-path grease mixing and adding all-in-one machine comprises a mixing and adding all-in-one machine, a control panel is arranged on the mixing and adding all-in-one machine, a cleaning mechanism is arranged on the outer wall of the mixing and adding all-in-one machine above the control panel, and the cleaning mechanism cleans the control panel; a mixing and heating mechanism is arranged in the mixing and adding all-in-one machine, the mixing and heating mechanism is connected with a multi-component metering mechanism, and the multi-component metering mechanism is connected into the mixing and adding all-in-one machine; by designing the grease metering scale electric heating plate, grease can be effectively preheated, it is ensured that molasses can still keep good fluidity at the low temperature, and the production efficiency is improved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of multi-path grease mixing and adding integrated machine. BACKGROUND

[0002] Multi-path grease mixing and adding integrated machine is a kind of mechanical device for mixing and adding multiple grease or lubricating oil into equipment according to specific proportion, which is often used in automated production line or scene needing accurate control of grease ratio, such as in industrial machinery, automobile, food processing and other fields;

[0003] In the field of feed production and processing, precise addition and uniform spraying of molasses (grease) is a key process link to improve feed quality. Traditional liquid addition systems generally have the following technical defects: poor low-temperature fluidity leading to pipeline blockage. Molasses has significant temperature sensitivity. Conventional equipment lacks effective constant temperature control mechanism. When the ambient temperature is lower than 40℃, the viscosity of molasses increases sharply, leading to increased pumping resistance, accumulation of pipeline residues, and easy clogging of nozzles and deviation of ingredient accuracy. Especially in winter production, the equipment needs to be frequently stopped for manual cleaning, which seriously affects production efficiency.

[0004] At the same time, the external operation panel of the existing equipment's mixing and adding integrated machine is directly exposed to the production environment. Long-term exposure to dust, molasses splashing and humid air environment can cause dirt accumulation on the panel surface, leading to decreased touch sensitivity or even misoperation. Operators need to frequently stop and use additional cleaning tools (such as screwdrivers to disassemble the panel and brushes to clean the gaps), which increases maintenance costs and affects production continuity. Long-term dust accumulation may also penetrate the internal circuit, causing poor contact or short circuit failure, posing a safety hazard.

[0005] Therefore, the utility model provides a kind of multi-path grease mixing and adding integrated machine to solve the above problems. UTILITY MODEL CONTENTS

[0006] The utility model aims to provide a kind of multi-path grease mixing and adding integrated machine to solve the problem of molasses having significant temperature sensitivity in the above background technology, conventional equipment lacking effective constant temperature control mechanism, viscosity of molasses increasing sharply when ambient temperature is lower than 40℃, leading to increased pumping resistance, accumulation of pipeline residues, and easy clogging of nozzles and deviation of ingredient accuracy.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a kind of multi-path grease mixing and adding integrated machine, including mixing and adding integrated machine, control panel is provided on the mixing and adding integrated machine, the control panel is embedded in the front part of mixing and adding integrated machine, the outer wall of mixing and adding integrated machine above control panel is provided with cleaning mechanism, and the control panel is cleaned by the cleaning mechanism;Mixing and adding integrated machine is provided with mixing heating mechanism, and the mixing heating machine is connected with multiple component metering mechanism, and the multiple component metering mechanism is connected in mixing and adding integrated machine.

[0008] As the improvement of the above technical solution, the mixing heating mechanism includes a mixing stirring barrel placed in the mixing and adding integrated machine, a mixing stirring barrel electric heating plate provided on the outer wall of the mixing stirring barrel, an emulsifier connected with the mixing stirring barrel, and a mixing stirring barrel temperature sensor installed on the mixing stirring barrel.

[0009] As the improvement of the above technical solution, the multiple component metering mechanism includes a first grease metering scale electric heating plate connected with the mixing stirring barrel, a first grease metering scale provided on the first grease metering scale electric heating plate, a second grease metering scale connected with the mixing stirring barrel, a second grease metering scale electric heating plate provided on the second grease metering scale, an emulsifier metering scale connected between the first grease metering scale electric heating plate and the second grease metering scale, a first grease metering scale oil inlet valve connected on the first grease metering scale electric heating plate, a first grease metering scale temperature sensor provided on the first grease metering scale electric heating plate, an emulsifier metering scale feeding valve provided on the second grease metering scale, a second grease metering scale oil inlet valve connected with the second grease metering scale, a second grease metering scale temperature sensor provided on the second grease metering scale, a comprehensive metering scale connected with the mixing stirring barrel, a hot water feeding valve connected with the comprehensive metering scale, a first additive feeding valve and a second additive feeding valve connected with the comprehensive metering scale.

[0010] As the improvement of the above technical solution, the multiple component metering mechanism further includes grease metering scale oil outlet valves, second grease metering scale oil outlet valves and comprehensive metering scale oil outlet valves respectively provided on the outer walls of the connecting pipelines of the first grease metering scale electric heating plate, the second grease metering scale and the comprehensive metering scale with the mixing stirring barrel.

[0011] As the improvement of the above technical solution, the mixing and adding integrated machine is externally connected with a spraying atomization mechanism, the spraying atomization mechanism is connected with the mixing heating mechanism, and the spraying atomization mechanism includes an oil injection pump connected with the bottom of the mixing stirring barrel, a pressure sensor provided on the oil injection pump, and a gas blowing valve provided on the pressure sensor.

[0012] As the improvement of the above technical scheme, the mounting plate is arranged on the outer wall of the mixing and adding all-in-one machine, the sliding rail is arranged in the mounting plate, the sliding block is slidably connected to the inner wall of the sliding rail, the universal joint is arranged on the sliding block, the long rod is hingedly connected to one end of the universal joint, the short rod is hingedly connected to the other end of the long rod, the rotating rod is connected to the other end of the short rod, the sliding groove is arranged in the sliding rail, the guide block is connected to the sliding block and slidably connected to the sliding groove, and the cleaning rod is connected to the guide block.

[0013] As the improvement of the above technical scheme, the mounting plate is arranged on the outer wall of the mixing and adding all-in-one machine, the sliding rail is arranged in the mounting plate, the sliding block is slidably connected to the inner wall of the sliding rail, the universal joint is arranged on the sliding block, the long rod is hingedly connected to one end of the universal joint, the short rod is hingedly connected to the other end of the long rod, the rotating rod is connected to the other end of the short rod, the sliding groove is arranged in the sliding rail, the guide block is connected to the sliding block and slidably connected to the sliding groove, and the cleaning rod is connected to the guide block.

[0014] As the improvement of the above technical scheme, the mounting plate is arranged on the outer wall of the mixing and adding all-in-one machine, the sliding rail is arranged in the mounting plate, the sliding block is slidably connected to the inner wall of the sliding rail, the universal joint is arranged on the sliding block, the long rod is hingedly connected to one end of the universal joint, the short rod is hingedly connected to the other end of the long rod, the rotating rod is connected to the other end of the short rod, the sliding groove is arranged in the sliding rail, the guide block is connected to the sliding block and slidably connected to the sliding groove, and the cleaning rod is connected to the guide block.

[0015] As the improvement of the above technical scheme, the mounting plate is arranged on the outer wall of the mixing and adding all-in-one machine, the sliding rail is arranged in the mounting plate, the sliding block is slidably connected to the inner wall of the sliding rail, the universal joint is arranged on the sliding block, the long rod is hingedly connected to one end of the universal joint, the short rod is hingedly connected to the other end of the long rod, the rotating rod is connected to the other end of the short rod, the sliding groove is arranged in the sliding rail, the guide block is connected to the sliding block and slidably connected to the sliding groove, and the cleaning rod is connected to the guide block.

[0016] As the improvement of the above technical scheme, the mounting plate is arranged on the outer wall of the mixing and adding all-in-one machine, the sliding rail is arranged in the mounting plate, the sliding block is slidably connected to the inner wall of the sliding rail, the universal joint is arranged on the sliding block, the long rod is hingedly connected to one end of the universal joint, the short rod is hingedly connected to the other end of the long rod, the rotating rod is connected to the other end of the short rod, the sliding groove is arranged in the sliding rail, the guide block is connected to the sliding block and slidably connected to the sliding groove, and the cleaning rod is connected to the guide block.

[0017] Compared with the prior art, the utility model has the advantages of:

[0018] 1. The traditional equipment is prone to molasses viscosity rise in low temperature environment, causing pipeline blockage and seriously affecting production efficiency. By designing the grease metering scale electric heating plate (such as the first grease metering scale electric heating plate and the second grease metering scale electric heating plate), the grease can be effectively preheated to ensure that the molasses still maintains good fluidity at a lower temperature, avoiding the problems of increased pumping resistance and pipeline blockage. The temperature control design (such as the temperature sensor) of the equipment can accurately control the fluidity of the grease, improve the spraying effect of the molasses, avoid the phenomenon of frequent shutdown for cleaning of the traditional equipment, and improve the production efficiency.

[0019] 2. The spraying and atomizing mechanism in the equipment is used in cooperation with the pressure sensor through the oil injection pump, which can ensure that the spraying pressure of the molasses remains stable. The air blowing valve enhances the atomization effect to ensure uniform spraying of the grease and improve the quality consistency of the feed. The emulsifying machine is used for high-speed stirring to ensure homogeneous mixing of the grease, emulsifying agent, additives and other materials, further improving the uniformity of spraying and the accuracy of ingredient, and avoiding quality fluctuations caused by uneven mixing in the traditional spraying method.

[0020] 3. The cleaning mechanism is designed ingeniously, can efficiently clean the control panel, ensures long-term stable operation of the equipment, avoids failure caused by dust or molasses dirt on the panel, reduces the proportion deviation of ingredients through precise control of the feeding valves of various oils, emulsifiers and additives, ensures stable quality of the product, and avoids errors caused by manual adjustment of the proportion of ingredients in traditional equipment BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a three-dimensional structure state schematic view of the utility model;

[0022] Figure 2 It is a three-dimensional structure state schematic view of the cleaning mechanism of the utility model;

[0023] Figure 3 It is a three-dimensional structure state schematic view of the cleaning mechanism of the utility model from the bottom;

[0024] Figure 4 It is a three-dimensional structure state schematic view of the utility model from the front;

[0025] Figure 5 It is a three-dimensional structure state schematic view of the utility model from the front;

[0026] Figure 6 It is a three-dimensional structure state schematic view of the utility model from the front;

[0027] In the drawing: 1, mixing and adding all-in-one machine; 2, safety alarm device; 3, control panel; 4, cleaning mechanism; 41, mounting plate; 42, sliding rail; 43, sliding block; 44, universal joint; 45, long rod; 46, short rod; 47, rotating rod; 48, sliding groove; 49, guide block; 410, cleaning rod; 5, mixing and stirring barrel; 6, mixing and stirring barrel electric heating plate; 7, emulsifying machine; 8, mixing and stirring barrel temperature sensor; 9, oil metering scale oil discharge valve; 10, first oil metering scale; 11, first oil metering scale electric heating plate; 12, first oil metering scale oil inlet valve; 13, first oil metering scale temperature sensor; 14, emulsifier metering scale; 15, emulsifier metering scale feeding valve; 16, second oil metering scale electric heating plate; 17, second oil metering scale; 18, second oil metering scale oil inlet valve; 19, second oil metering scale temperature sensor; 20, comprehensive metering scale; 21, hot water feeding valve; 22, first additive feeding valve; 23, second additive feeding valve; 24, second oil metering scale oil discharge valve; 25, comprehensive metering scale oil discharge valve; 26, pressure sensor; 27, air blowing valve; 28, oil injection pump. DETAILED DESCRIPTION

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example:

[0030] like Figures 1-6 As shown in the figure, this embodiment proposes a multi-channel oil mixing and adding integrated machine, including a mixing and adding integrated machine 1, a safety alarm device 2 installed on the mixing and adding integrated machine 1, a control panel 3 installed on the mixing and adding integrated machine 1, the control panel 3 is embedded in the front of the mixing and adding integrated machine 1 and integrates a touch screen operation interface, a cleaning mechanism 4 is provided on the outer wall of the mixing and adding integrated machine 1 above the control panel 3, the cleaning mechanism 4 cleans the control panel 3, a mixing and heating mechanism is provided inside the mixing and adding integrated machine 1, the mixing and heating mechanism is connected to a multi-component metering mechanism, the multi-component metering mechanism is connected inside the mixing and adding integrated machine 1, and a spray atomizing mechanism is connected to the outside of the mixing and adding integrated machine 1, the spray atomizing mechanism is connected to the mixing and heating mechanism;

[0031] The mixing and heating mechanism includes a mixing tank 5 placed inside the mixing and adding integrated machine 1, a mixing tank heating plate 6 set on the outer wall of the mixing tank 5, an emulsifier 7 connected to the mixing tank 5, and a mixing tank temperature sensor 8 installed on the mixing tank 5.

[0032] The multi-component metering mechanism includes a first oil metering scale heating plate 11 connected to the mixing tank 5, a first oil metering scale 10 mounted on the first oil metering scale heating plate 11, a second oil metering scale 17 connected to the mixing tank 5, a second oil metering scale heating plate 16 mounted on the second oil metering scale 17, an emulsifier metering scale 14 connected between the first oil metering scale heating plate 11 and the second oil metering scale 17, a first oil metering scale inlet valve 12 connected to the first oil metering scale heating plate 11, a first oil metering scale temperature sensor 13 mounted on the first oil metering scale heating plate 11, an emulsifier metering scale inlet valve 15 mounted on the second oil metering scale 17, a second oil metering scale inlet valve 18 connected to the second oil metering scale 17, a second oil metering scale temperature sensor 19 mounted on the second oil metering scale 17, a comprehensive metering scale 20 connected to the mixing tank 5, a hot water inlet valve 21 connected to the comprehensive metering scale 20, and a first additive inlet valve 22 and a second additive inlet valve 23 connected to the comprehensive metering scale 20.

[0033] The multi-component metering mechanism further comprises grease metering scale oil discharge valves 9, 24 and 25 respectively arranged on the outer walls of the connecting pipelines of the first grease metering scale electric hot plate 11, the second grease metering scale 17 and the comprehensive metering scale 20 and the mixing and stirring barrel 5.

[0034] The spraying and atomizing mechanism comprises an oil injection pump 28 connected to the bottom of the mixing and stirring barrel 5, a pressure sensor 26 arranged on the oil injection pump 28 and an air blowing valve 27 arranged on the pressure sensor 26.

[0035] The working process is as follows: metering and heating: the first grease metering scale electric hot plate 11 and the second grease metering scale electric hot plate 16 preheat the grease, and the first grease metering scale temperature sensor 13 and the second grease metering scale temperature sensor 19 ensure the fluidity of the grease; the emulsifier, hot water and additives are accurately fed into the comprehensive metering scale 20 according to the formula proportion through the first grease metering scale oil inlet valve 12, the emulsifier metering scale feed valve 15, the second grease metering scale oil inlet valve 18, the hot water feed valve 21, the first additive feed valve 22 and the second additive feed valve 23; mixing and emulsification: the metered materials enter the mixing and stirring barrel 5, the electric hot plate 6 is heated to the set temperature, the emulsifier 7 is high-speed stirred to realize homogeneous mixing, and the temperature sensor 8 realizes real-time regulation and control of the heating power; spraying and atomizing: the mixed liquid is pressurized and delivered through the oil injection pump 28, the pressure sensor 26 monitors the pressure stability, and the air blowing valve 27 introduces compressed air to enhance the atomizing effect; after the spraying is completed, the air blowing valve 27 is started to clean the residual in the pipeline.

[0036] The cleaning mechanism 4 comprises a mounting plate 41 arranged on the outer wall of the mixing and adding all-in-one machine 1, a sliding rail 42 opened in the mounting plate 41, a sliding block 43 slidingly connected to the inner wall of the sliding rail 42, a universal joint 44 arranged on the sliding block 43, a long rod 45 hingedly connected to one end of the universal joint 44, a short rod 46 hingedly connected to the other end of the long rod 45, a rotating rod 47 connected to the other end of the short rod 46, a sliding groove 48 opened in the sliding rail 42, a guide block 49 connected to the sliding block 43 and slidingly connected to the sliding groove 48, and a cleaning rod 410 connected to the guide block 49.

[0037] When the staff needs to clean the display screen on the control panel 3, the rotating rod 47 is rotated to drive the short rod 46 to rotate, the long rod 45 is pushed to move, the sliding block 43 is slid in the sliding rail 42, the sliding rail 42 drives the guide block 49 to slide synchronously in the sliding groove 48, and the guide block 49 drives the cleaning rod 410 connected thereto to move synchronously. The cleaning rod 410 drives the cleaning pad to scrape and clean the display screen on the control panel 3 during the movement. The rotating rod 47 is continuously rotated to drive the sliding block 43 to reciprocatingly slide in the sliding rail 42, thereby improving the cleaning efficiency.

[0038] It is worth noting that the shape of the mounting plate 41 is set to L-shaped, the rotating rod 47 is connected with the short rod 46 through the short plate part of the mounting plate 41, and the rotating rod 47 is rotatably connected with the mounting plate 41 through a bearing, the L-shaped design can provide sufficient structural support, and the key components such as the slide rail 42 and the rotating rod 47 can be better fixed and supported; the length of the slide rail 42 is set to be greater than the length of the display screen on the control panel 3, and the outer wall of the rotating rod 47 is provided with external threads, and the external thread design can prevent slipping;

[0039] The bottom end of the cleaning rod 410 is glued with a cleaning pad, the cleaning pad is tightly attached to the display screen on the control panel 3, and the cleaning pad is attached to the display screen, so that the cleaning pad is in close contact with the screen during the cleaning process, thereby effectively removing dirt on the display screen;

[0040] The contact surface of the guide block 49 and the sliding groove 48 is a dovetail groove structure, the width of the dovetail groove structure gradually decreases from the top to the bottom, so as to limit the sliding direction of the guide block 49 and prevent derailment.

[0041] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-channel grease mixing and adding integrated machine, characterized in that: The application relates to a mixing and adding all-in-one machine (1), which is provided with a control panel (3) on the outer wall of the mixing and adding all-in-one machine (1), a cleaning mechanism (4) arranged above the control panel (3) and used for cleaning the control panel (3), a mixing and heating mechanism arranged in the mixing and adding all-in-one machine (1), and a multi-component metering mechanism connected with the mixing and heating mechanism and arranged in the mixing and adding all-in-one machine (1).

2. The multi-path grease mixing and adding all-in-one machine according to claim 1, characterized in that: The mixing and heating mechanism comprises a mixing and stirring barrel (5) arranged in the mixing and adding all-in-one machine (1), a mixing and stirring barrel electric heating plate (6) arranged on the outer wall of the mixing and stirring barrel (5), an emulsifier (7) connected with the mixing and stirring barrel (5), and a mixing and stirring barrel temperature sensor (8) arranged on the mixing and stirring barrel (5).

3. The multi-path grease mixing and adding all-in-one machine according to claim 1, characterized in that: The multi-component metering mechanism comprises a first grease metering scale electric heating plate (11) connected with the mixing and stirring barrel (5), a first grease metering scale (10) arranged on the first grease metering scale electric heating plate (11), a second grease metering scale (17) connected with the mixing and stirring barrel (5), a second grease metering scale electric heating plate (16) arranged on the second grease metering scale (17), a emulsifier metering scale (14) connected between the first grease metering scale electric heating plate (11) and the second grease metering scale (17), a first grease metering scale oil inlet valve (12) connected with the first grease metering scale electric heating plate (11), a first grease metering scale temperature sensor (13) arranged on the first grease metering scale electric heating plate (11), an emulsifier metering scale oil inlet valve (15) arranged on the second grease metering scale (17), a second grease metering scale oil inlet valve (18) connected with the second grease metering scale (17), a second grease metering scale temperature sensor (19) arranged on the second grease metering scale (17), a comprehensive metering scale (20) connected with the mixing and stirring barrel (5), a hot water oil inlet valve (21) connected with the comprehensive metering scale (20), a first additive oil inlet valve (22) and a second additive oil inlet valve (23) connected with the comprehensive metering scale (20).

4. The multi-path grease mixing and adding all-in-one machine according to claim 3, characterized in that: The multi-component metering mechanism further comprises grease metering scale oil outlet valves (9), second grease metering scale oil outlet valves (24) and comprehensive metering scale oil outlet valves (25) arranged on the outer walls of the connecting pipelines of the first grease metering scale electric heating plate (11), the second grease metering scale (17) and the comprehensive metering scale (20) and the mixing and stirring barrel (5) respectively.

5. The multi-path grease mixing and adding all-in-one machine according to claim 1, characterized in that: The mixing and adding all-in-one machine (1) is externally connected with a spraying and atomizing mechanism, the spraying and atomizing mechanism is connected with the mixing and heating mechanism, and the spraying and atomizing mechanism comprises an oil injection pump (28) connected with the bottom of the mixing and stirring barrel (5), a pressure sensor (26) arranged on the oil injection pump (28) and a gas blowing valve (27) arranged on the pressure sensor (26).

6. The multi-path grease mixing and adding all-in-one machine according to claim 1, characterized in that: The cleaning mechanism (4) comprises a mounting plate (41) mounted on the outer wall of the mixing and adding all-in-one machine (1), a sliding rail (42) opened in the mounting plate (41), a sliding block (43) slidingly connected to the inner wall of the sliding rail (42), a universal joint (44) arranged on the sliding block (43), an elongated rod (45) with one end hinged to the universal joint (44), a short rod (46) hinged to the other end of the elongated rod (45), a rotating rod (47) connected to the other end of the short rod (46), a sliding groove (48) opened in the sliding rail (42), a guide block (49) connected to the sliding block (43) and slidingly connected to the sliding groove (48), and a cleaning rod (410) connected to the guide block (49).

7. The multi-path grease mixing and adding all-in-one machine according to claim 6, characterized in that: The mounting plate (41) is in L shape, the rotating rod (47) is connected to the short rod (46) through the short plate portion of the mounting plate (41), and the rotating rod (47) is rotatably connected to the mounting plate (41) through a bearing.

8. The multi-path grease mixing and adding all-in-one machine according to claim 6, characterized in that: The length of the sliding rail (42) is greater than the length of the display screen on the control panel (3), and the outer wall of the rotating rod (47) is provided with external threads.

9. The multi-path grease mixing and adding all-in-one machine according to claim 6, characterized in that: The bottom end of the cleaning rod (410) is glued with a cleaning pad, and the cleaning pad is tightly attached to the display screen on the control panel (3).

10. The multi-path grease mixing and adding all-in-one machine according to claim 6, characterized in that: The contact surface of the guide block (49) and the sliding groove (48) is in dovetail groove structure, the width of the dovetail groove structure gradually decreases from the top to the bottom, so as to limit the sliding direction of the guide block (49) and prevent derailment.