Grease runout shutdown device for a wet sprayer
By introducing a float level switch and control components into the lubrication system of the wet spraying machine, automatic shutdown and audible and visual alarms are achieved when the lubricating grease is insufficient, solving the problem of component wear caused by insufficient oil in the wet spraying machine and improving construction efficiency and economy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PINGDINGSHAN ZHONGCHUANG SUPPORT MASCH MFG CO LTD
- Filing Date
- 2025-09-19
- Publication Date
- 2026-06-23
Smart Images
Figure CN224397571U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of lubrication systems for wet spraying machines, specifically a device for stopping a wet spraying machine when it is low on grease. Background Technology
[0002] As the core equipment for concrete spraying, the pump-type wet shotcrete machine's pumping system must withstand continuous high loads and high-frequency operations during shotcreting, requiring sufficient lubrication to reduce component wear. While existing wet shotcrete machines are equipped with automatic lubrication devices, their oil tank capacity is limited, and they lack reliable oil shortage monitoring and shutdown protection mechanisms. Even when the lubricating grease is depleted below the safe level, the equipment continues to operate. Furthermore, the dusty and noisy construction sites make it difficult for workers to detect oil shortages in a timely manner, easily leading to damage to critical components due to dry friction. Equipment damage necessitates shutdown for repairs, not only delaying the construction schedule but also incurring high costs for component replacement and repair, severely impacting construction efficiency and economics. Utility Model Content
[0003] (a) Technical problems to be solved
[0004] To overcome the aforementioned deficiencies of the prior art, this utility model provides a grease shortage shutdown device for wet spraying machines, solving the problem in the prior art:
[0005] When the lubrication system of a wet spraying machine is low on oil, it cannot automatically shut down, and the alarm prompts are not obvious, leading to wear and damage to key components of the equipment, delays in construction, and increased maintenance costs.
[0006] (II) Technical Solution
[0007] To achieve the above objectives, this utility model provides the following technical solution: a grease shortage shutdown device for a wet spraying machine, comprising a grease pump housing, an oil reservoir inside the grease pump housing, and a grease pump housing cover detachably connected to the top of the grease pump housing; a float level switch is fixedly installed on the grease pump housing cover, the float end of the float level switch extending vertically into the oil reservoir, and the float level switch is located at the bottom of the grease pump housing cover; it also includes a control component, comprising a circuit breaker, an AC contactor, a buzzer, and an alarm indicator light, all of which are fixedly mounted on a mounting plate; the buzzer, circuit breaker, AC contactor, alarm indicator light, and float level switch are electrically connected via electrical control lines, and the output terminal at the bottom of the AC contactor is electrically connected to an oil pump motor via a motor main line.
[0008] Optionally, the float level switch is a normally closed detection element, the length of its detection rod is adapted to the depth of the oil tank, and the lowest trigger position of the float of the float level switch in the oil tank is flush with the lowest safe level of the oil tank.
[0009] Optionally, the mounting plate is an epoxy resin insulating board, and the mounting plate has several oblong mounting holes. The circuit breaker, AC contactor, buzzer and alarm indicator are all fixed by bolts to the oblong mounting holes.
[0010] Optionally, a level detection chamber is provided in the oil tank corresponding to the float position of the float level switch, and the inner wall of the level detection chamber is smooth and without protrusions.
[0011] Optionally, the electrical control line is wrapped with a flame-retardant insulating sleeve, and the connection ends of the electrical control line with the AC contactor and the float level switch are all equipped with a waterproof structure.
[0012] (III) Beneficial Effects
[0013] This utility model provides a device for stopping a wet spraying machine when the lubricating grease is insufficient, which has the following beneficial effects:
[0014] This wet spraying machine uses a grease low-oil shutdown device, which monitors the oil level in the reservoir in real time via a float level switch. When oil is low, it automatically triggers a shutdown and an audible and visual alarm, fundamentally preventing dry friction damage to components and extending the equipment's service life. The dual audible and visual alarms are highly recognizable in complex construction sites, with a short alarm response time, promptly reminding personnel to replenish oil. The overall structure is simple, requiring no modification to the main equipment, resulting in low modification costs per unit, and it is compatible with mainstream wet spraying machine models. At the same time, it reduces equipment maintenance frequency and time, ensuring continuous construction, improving daily construction efficiency, and saving low annual maintenance costs per unit, combining safety and economy. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the structure of the grease pump housing of this utility model;
[0017] Figure 3 This utility model Figure 2 A magnified structural diagram of point A in the middle.
[0018] In the diagram: 1. Grease pump housing; 2. Oil reservoir; 3. Grease pump housing cover; 4. Float level switch; 401. Detection rod; 5. Circuit breaker; 6. AC contactor; 7. Buzzer; 8. Alarm indicator light; 9. Mounting plate; 10. Electrical control wire; 11. Motor main wire; 12. Oil pump motor; 13. Waist-shaped mounting hole; 14. Flame-retardant insulating sleeve; 15. Liquid level detection chamber. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0020] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by those skilled in the art. The terms "first," "," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Words such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.
[0021] Please see Figures 1 to 3This utility model provides a technical solution: a grease shortage shutdown device for wet spraying machines, comprising a grease pump housing 1 for containing grease, protecting the internal transmission and conveying components of the pump, and providing a sealed and pressure-bearing structural foundation for stable pressurization and delivery of grease. The grease pump housing 1 contains an oil storage tank 2, which is a core container for storing oil in various mechanical equipment. The oil storage tank 2 allows for the sedimentation of impurities in the oil, assists in heat dissipation, and protects internal and related components, providing a fundamental guarantee for a stable supply of oil to the equipment's lubrication or power system. The top of the grease pump housing 1 is detachable. A grease pump housing cover 3 is connected to the grease pump housing 1. The grease pump housing cover 3 is a cover component that matches the grease pump housing 1. Its main function is to seal the housing to prevent grease leakage and the intrusion of external impurities, while protecting the internal components and providing a convenient operating channel for adding grease and inspecting the internal structure, ensuring stable operation of the grease pump. A float level switch 4 is fixedly installed on the grease pump housing cover 3. The float end of the float level switch 4 extends vertically into the oil reservoir 2, and the float level switch 4 is located at the bottom of the grease pump housing cover 3. The float level switch 4 is a level control system based on the float rising and falling with the liquid level. The detection and control components, used in the oil storage tank 2, achieve real-time monitoring of the liquid level and automatic control of the pump's start and stop through trigger switch action, ensuring stable liquid level. It also includes a control assembly comprising a circuit breaker 5, an AC contactor 6, a buzzer 7, and an alarm indicator light 8. The circuit breaker 5, AC contactor 6, buzzer 7, and alarm indicator light 8 are all fixedly mounted on the mounting plate 9. The buzzer 7, circuit breaker 5, AC contactor 6, and alarm indicator light 8 are electrically connected to the float level switch 4 via an electrical control line 10. The circuit breaker 5 is used for normal connection and disconnection of power in this equipment. The circuit is a core protective electrical appliance that can automatically cut off the circuit when overload or short circuit occurs, preventing equipment damage and electrical accidents, and ensuring electrical safety. The AC contactor 6 is a core electrical component that facilitates remote or automatic control of the machine by users. It mainly connects and disconnects the high-power main circuit through low-voltage control signals, ensuring the safety and reliability of circuit switching. The alarm indicator light 8 is used to sound an alarm when the equipment malfunctions. The output terminal at the bottom of the AC contactor 6 is electrically connected to the oil pump motor 12 through the motor main line 11. The oil pump motor 12 is the core power component in the device.
[0022] The float level switch 4 is a normally closed detection element. The length of its detection rod 401 is adapted to the depth of the oil tank 2, and the lowest trigger position of the float of the float level switch 4 in the oil tank 2 is flush with the lowest safe liquid level of the oil tank 2. As a liquid level monitoring element of the oil tank 2, the normally closed float level switch 4 has its detection rod 401 length adapted to the depth of the oil tank 2 to cover the effective liquid level range of the oil tank. The lowest trigger position of the float in the tank is flush with the lowest safe liquid level of the oil tank 2. It can trigger a change in the switch state when the liquid level drops below the safe value, thereby realizing a low liquid level alarm or linkage to cut off equipment such as the oil pump, avoiding equipment failure caused by insufficient oil.
[0023] Mounting plate 9 is made of epoxy resin insulation board to ensure electrical insulation safety. Mounting plate 9 has several waist-shaped mounting holes 13. Circuit breaker 5, AC contactor 6, buzzer 7 and alarm indicator 8 are all fixed with bolts to the waist-shaped mounting holes 13. The design of the waist-shaped holes also makes it convenient to fine-tune the installation position of each electrical component in the future, ensuring that the component layout is stable and adapts to the assembly requirements of the overall electrical system.
[0024] A level detection chamber 15 is provided inside the oil tank 2 corresponding to the float position of the float level switch 4. This detection chamber provides an independent and stable space for the float to move. The inner wall of the level detection chamber 15 is smooth and without protrusions, which can effectively prevent the float from being stuck or obstructed during the rise and fall process, ensuring that the float can move accurately with the change of liquid level, thereby ensuring the accuracy of the detection result of the float level switch 4 and preventing false triggering or detection failure caused by mechanical interference.
[0025] The electrical control line 10 is wrapped with a flame-retardant insulating sleeve 14, which not only provides electrical insulation to prevent leakage risk, but also has flame-retardant properties to reduce fire hazards, while protecting the control line from external wear. In addition, the connection ends of the electrical control line 10 with the AC contactor 6 and the float level switch 4 are equipped with waterproof structures, which can effectively prevent water vapor and dust from entering the wiring parts and avoid affecting the operation of components due to poor contact or short circuit. Overall, the safety, reliability and environmental adaptability of the electrical circuit connection are guaranteed.
[0026] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.
[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A grease run-out shutdown device for a wet sprayer comprising a grease pump housing (1) characterised in that: The grease pump housing (1) is equipped with an oil reservoir (2), and a grease pump housing cover (3) is detachably connected to the top of the grease pump housing (1); a float level switch (4) is fixedly installed on the grease pump housing cover (3), the float end of the float level switch (4) extends vertically into the oil reservoir (2), and the float level switch (4) is located at the bottom of the grease pump housing cover (3); it also includes a control component, which includes a circuit breaker (5) and an AC contactor (6). The circuit breaker (5), AC contactor (6), buzzer (7) and alarm indicator (8) are all fixedly installed on the mounting plate (9); the buzzer (7), circuit breaker (5), AC contactor (6), alarm indicator (8) and float level switch (4) are electrically connected through electrical control line (10), and the output end of the bottom of the AC contactor (6) is electrically connected to the oil pump motor (12) through the motor main line (11).
2. The grease shortage shutdown device for a wet spraying machine according to claim 1, characterized in that: The float level switch (4) is a normally closed detection element. The length of its detection rod (401) is adapted to the depth of the oil tank (2), and the lowest trigger position of the float of the float level switch (4) in the oil tank (2) is flush with the lowest safe liquid level of the oil tank (2).
3. The grease shortage shutdown device for a wet spraying machine according to claim 1, characterized in that: The mounting plate (9) is an epoxy resin insulating board, and the mounting plate (9) has several waist-shaped mounting holes (13). The circuit breaker (5), AC contactor (6), buzzer (7) and alarm indicator (8) are all fixed by bolts to the waist-shaped mounting holes (13).
4. The grease shortage shutdown device for a wet spraying machine according to claim 1, characterized in that: The oil storage tank (2) is provided with a liquid level detection chamber (15) corresponding to the float position of the float level switch (4). The inner wall of the liquid level detection chamber (15) is smooth and without protrusions.
5. The grease shortage shutdown device for a wet spraying machine according to claim 1, characterized in that: The electrical control line (10) is wrapped with a flame-retardant insulating sleeve (14), and the connection ends of the electrical control line (10) with the AC contactor (6) and the float level switch (4) are all equipped with waterproof structures.