Automatic feeding and early warning device for piezoresistor blank forming
By introducing loading detection sensors and low-level alarm sensors into the varistor body forming device, and using capacitive proximity switch to detect powder progress, the problem of manual monitoring of loading speed in the prior art is solved, fully automated production is achieved, labor costs are reduced and production efficiency is improved.
Patent Information
- Application Number
- CN202421819990.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-07-30
AI Technical Summary
The existing varistor blank powder loading device cannot achieve fully automated production, and requires manual monitoring and adjustment of loading speed, increasing labor costs, and affecting production efficiency.
Automatic feeding and early warning devices including loading detection sensors and low-level alarm sensors are adopted, and the powder progress is detected by capacitive proximity switches, and automatic control is achieved by combining vacuum pumps and electric discharge valves.
It realizes automatic detection of powder loading progress, reduces labor costs, improves production efficiency, and achieves fully automated production.
Smart Images
Figure CN223162753U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a feeding device, in particular to an automatic feeding and warning device for the forming of varistor blanks. Background Art
[0002] At present, cylindrical molds are generally used to press blank powders into cylindrical varistor blank tablets for varistors. At present, the blank powders are fed by a powder feeding device, so that the blank powders are transported into the cylindrical mold. The above-mentioned powder feeding device includes a feeding cylinder, a vacuum feeding cylinder, a storage cylinder and a vacuum pump. The discharge port of the feeding cylinder is connected to the feeding port of the vacuum feeding cylinder through a feeding pipe. The discharge port of the vacuum feeding cylinder is arranged on the feeding port of the storage cylinder, and an electric blanking valve is connected to the feeding port of the storage cylinder; the vacuum pump is connected to the vacuum feeding cylinder through an air conveying pipe. Although this kind of powder feeding device can automatically feed the powder, since the feeding progress in the storage cylinder cannot be predicted, it is necessary to continuously monitor and adjust the feeding speed manually, which is difficult to achieve fully automated production, increases the labor cost and affects the production efficiency. Content of the Utility Model
[0003] The problem to be solved by the utility model is to provide an automatic feeding and warning device for the forming of varistor blanks, which can automatically detect the feeding progress of the powder and realize fully automatic feeding.
[0004] In order to solve the above technical problems, the technical scheme adopted by the utility model is as follows:
[0005] An automatic feeding and warning device for the forming of varistor blanks, including a feeding cylinder, a vacuum feeding cylinder, a storage cylinder and a vacuum pump. The discharge port of the feeding cylinder is connected to the feeding port of the vacuum feeding cylinder through a feeding pipe. The discharge port of the vacuum feeding cylinder is arranged on the feeding port of the storage cylinder, and an electric blanking valve is connected to the feeding port of the storage cylinder; the vacuum pump is connected to the vacuum feeding cylinder through an air conveying pipe; it is characterized in that: it further includes a feeding detection sensor, a low-level alarm sensor and a controller. The side wall of the storage cylinder is provided with a first mounting hole and a second mounting hole. The first mounting hole is arranged at a position close to the feeding port of the storage cylinder, and the second mounting hole is arranged at a position close to the blanking port of the storage cylinder. The feeding detection sensor is arranged in the first mounting hole, and the low-level alarm sensor is arranged in the second mounting hole. The detection heads of the feeding detection sensor and the low-level alarm sensor are both in the storage cylinder; the controller is arranged on one side outside the storage cylinder. The feeding detection sensor and the low-level alarm sensor are both electrically connected to the control input end of the controller, and the vacuum pump and the electric blanking valve are both electrically connected to the control output end of the controller; the feeding detection sensor and the low-level alarm sensor are both capacitive proximity switches.
[0006] The above-mentioned feeding detection sensor and low-level alarm sensor are both capacitive proximity switches. A capacitive proximity switch is a type of position sensor whose working principle is based on the change in capacitance to detect the approach of an object. When an object (whether it is a conductor or a non-conductor) approaches the proximity switch, the change in the dielectric constant of the object will cause a change in capacitance, which in turn affects the circuit state connected to the measuring head, thereby controlling the on or off of the switch. This capacitive proximity switch can detect not only conductors but also insulators, liquids, and powdered materials. For non-metallic objects, the operating distance depends on the dielectric constant of the material. The greater the dielectric constant of the material, the greater the possible operating distance. When detecting powdered objects, the change in the dielectric constant of the powdered objects will cause a change in capacitance, which in turn triggers the operation of the capacitive proximity switch.
[0007] During feeding, the vacuum pump and the electric blanking valve are opened through the controller. The vacuum pump evacuates the inside of the vacuum feeding cylinder through the air delivery pipe, creating a vacuum inside the vacuum feeding cylinder. A stream of air is formed inside the vacuum feeding cylinder under vacuum. Under the action of this stream of air, the powder in the feeding cylinder is transported through the feeding pipe into the vacuum feeding cylinder and then further transported into the storage cylinder. When the powder in the storage cylinder is added to the upper part of the storage cylinder, the powder just blocks the detection head of the feeding detection sensor. The feeding detection sensor transmits the signal that the powder has reached the upper limit to the controller, and the controller then transmits the signal to pause feeding to the vacuum pump and the electric blanking valve, controlling the vacuum pump and the electric blanking valve to close.
[0008] When the powder in the storage cylinder is continuously transported through the blanking port of the storage cylinder into the cylindrical mold, the powder in the storage cylinder gradually decreases. When the low-level alarm sensor is not blocked by the powder, the low-level alarm sensor transmits the signal that the powder is below the lower limit to the controller, and the controller then transmits the signal to continue feeding to the vacuum pump and the electric blanking valve, controlling the vacuum pump and the electric blanking valve to open, so that the powder in the feeding cylinder is continuously transported through the feeding pipe into the vacuum feeding cylinder and then further transported into the storage cylinder.
[0009] In a preferred embodiment, the capacitive proximity switch includes a sensor body and a detection head. The sensor body is cylindrical, with external threads provided on the outer wall of the sensor body. At least one locking nut matching the external threads is installed on the outer wall of the sensor body. Internal threads matching the external threads are provided in both the first mounting hole and the second mounting hole. The sensor body of the feeding detection sensor is installed in the first mounting hole through the mutual cooperation of the external threads and the internal threads, and the sensor body of the low-level alarm sensor is installed in the second mounting hole through the mutual cooperation of the external threads and the internal threads. The sensor body is locked to the storage cylinder through the locking nut.
[0010] In a further preferred embodiment, two locking nuts matching the external thread are installed on the outer wall of the sensor body. One locking nut is inside the storage cylinder, and the other is outside the storage cylinder. When the sensor body is locked in the first mounting hole or the second mounting hole through the cooperation of the external thread and the internal thread, the two locking nuts jointly clamp the outer wall of the storage cylinder, playing a further role in fixing the installation of the sensor body.
[0011] In a further preferred embodiment, circular rubber sheets are installed on the outer edge of the openings at the outer ends of the first mounting hole and the second mounting hole. There are multiple cross cuts in the middle of the circular rubber sheets, and the sensor body is located in the cross cuts. Through this setting, after unscrewing the locking nut and then screwing out the sensor body from the first mounting hole or the second mounting hole (or when screwing the sensor body into the first mounting hole or the second mounting hole), the cross cuts on the circular rubber sheets can frictionally clean the green body powder adhered to the detection head, preventing the green body powder from adhering excessively to the detection head and affecting the detection.
[0012] In a preferred embodiment, a filter is provided on the air delivery pipe. The filter can filter the gas pumped out by the vacuum pump from the vacuum feeding cylinder, intercept the impurities contained in the pumped-out gas, and prevent the impurities in the pumped-out gas from entering the interior of the vacuum pump and affecting the service life of the vacuum pump.
[0013] Compared with the prior art, the present utility model has the following advantages:
[0014] This automatic feeding and warning device can automatically detect the feeding progress of the powder material, realize fully automatic feeding, reduce labor costs, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;
[0016] Figure 2 is a schematic structural diagram of an embodiment of the present utility model with circular rubber sheets installed in the first mounting hole and the second mounting hole;
[0017] Figure 3 is Figure 2 a schematic structural diagram of the circular rubber sheet in DETAILED DESCRIPTION OF THE EMBODIMENTS
[0018] The present utility model will be specifically described below in conjunction with the accompanying drawings and specific embodiments.
[0019] As Figure 1As shown in the figure, the automatic feeding and warning device for the formation of a varistor blank body in this embodiment includes a feeding cylinder 1, a vacuum feeding cylinder 2, a storage cylinder 3, a vacuum pump 4, a feeding detection sensor 5, a low-level alarm sensor 6, and a controller 8. The discharge port of the feeding cylinder 1 is connected to the feeding port of the vacuum feeding cylinder 2 through a feeding pipe 9. The discharge port of the vacuum feeding cylinder 2 is arranged on the feeding port of the storage cylinder 3, and an electric blanking valve 10 is connected to the feeding port of the storage cylinder 3. The vacuum pump 4 is connected to the vacuum feeding cylinder 2 through an air delivery pipe 11. The side wall of the storage cylinder 3 is provided with a first mounting hole 31 and a second mounting hole 32. The first mounting hole 31 is arranged at a position close to the feeding port of the storage cylinder 3, and the second mounting hole 32 is arranged at a position close to the blanking port of the storage cylinder 3. The feeding detection sensor 5 is arranged in the first mounting hole 31, and the low-level alarm sensor 6 is arranged in the second mounting hole 32. The detection heads 52 of the feeding detection sensor 5 and the low-level alarm sensor 6 are both located in the storage cylinder 3. The controller 8 is arranged on one side outside the storage cylinder 3. The feeding detection sensor 5 and the low-level alarm sensor 6 are both electrically connected to the control input end of the controller 8. The vacuum pump 4 and the electric blanking valve 10 are both electrically connected to the control output end of the controller 8. The feeding detection sensor 5 and the low-level alarm sensor 6 are both capacitive proximity switches.
[0020] Both of the above-mentioned feeding detection sensor 5 and low-level alarm sensor 6 are capacitive proximity switches. A capacitive proximity switch is a position sensor, and its working principle is based on the change of capacitance to detect the approach of an object. When an object (whether it is a conductor or a non-conductor) approaches the proximity switch, the change of the dielectric constant of the object will cause the change of capacitance, which in turn affects the circuit state connected to the measuring head, thereby controlling the on or off of the switch. The range that this capacitive proximity switch can detect is not limited to conductors, but also includes insulators, liquids, and powdery materials. For non-metallic objects, its operating distance depends on the dielectric constant of the material. The greater the dielectric constant of the material, the greater the possible operating distance. When detecting a powdery object, the change of the dielectric constant of the powdery object will cause the change of capacitance, which in turn triggers the action of the capacitive proximity switch.
[0021] During feeding, the vacuum pump 4 and the electric feeding valve 10 are opened through the controller 8. The vacuum pump 4 evacuates the inside of the vacuum feeding cylinder 2 through the air delivery pipe 11 to create a vacuum inside the vacuum feeding cylinder 2. A stream of air is formed inside the vacuum feeding cylinder 2 under the vacuum. Under the action of this stream of air, the powder in the feeding cylinder 1 is transported through the feeding pipe 9 into the inside of the vacuum feeding cylinder 2, and then the powder is further transported into the storage cylinder 3. When the powder in the storage cylinder 3 is added to the upper part of the storage cylinder 3, the powder just blocks the detection head 52 of the feeding detection sensor 5. The feeding detection sensor 5 transmits the signal that the powder has reached the upper limit to the controller 8, and the controller 8 then transmits the signal to pause feeding to the vacuum pump 4 and the electric feeding valve 10, controlling the vacuum pump 4 and the electric feeding valve 10 to close.
[0022] When the powder in the storage cylinder 3 is continuously transported through the discharge port of the storage cylinder 3 into the cylindrical mold, the powder in the storage cylinder 3 gradually decreases. When the low-level alarm sensor 6 is not blocked by the powder, the low-level alarm sensor 6 transmits the signal that the powder is below the lower limit to the controller 8. The controller 8 then transmits the signal to continue feeding to the vacuum pump 4 and the electric feeding valve 10, controlling the vacuum pump 4 and the electric feeding valve 10 to open, so that the powder in the feeding cylinder 1 is continuously transported through the feeding pipe 9 into the inside of the vacuum feeding cylinder 2, and then the powder is further transported into the storage cylinder 3.
[0023] The capacitive proximity switch includes a sensor body 51 and a detection head 52. The sensor body 51 is cylindrical. An external thread 511 is provided on the outer wall of the sensor body 51. At least one locking nut 512 matching the external thread 511 is installed on the outer wall of the sensor body 51. Internal threads 311 matching the external thread 511 are provided in both the first mounting hole 31 and the second mounting hole 32. The sensor body 51 of the feeding detection sensor 5 is installed in the first mounting hole 31 through the mutual cooperation of the external thread 511 and the internal thread 311. The sensor body 51 of the low-level alarm sensor 6 is installed in the second mounting hole 32 through the mutual cooperation of the external thread 511 and the internal thread 311. The sensor body 51 is locked on the storage cylinder 3 through the locking nut 512.
[0024] Two locking nuts 512 matching the external thread 511 are installed on the outer wall of the sensor body 51. One locking nut 512 is inside the storage cylinder 3, and one locking nut 512 is outside the storage cylinder 3. When the sensor body 51 is locked in the first mounting hole 31 or the second mounting hole 32 through the mutual cooperation of the external thread 511 and the internal thread 311, the two locking nuts 512 jointly clamp the outer wall of the storage cylinder 3, playing a further role in fixing the installation of the sensor body 51.
[0025] Such as Figures 2-3As shown, circular rubber sheets 12 are installed on the outer end opening edges of the first mounting hole 31 and the second mounting hole 32. Multiple cross cuts 121 are provided in the middle of the circular rubber sheet 12, and the sensor body 51 is located in the cross cuts 121. With this arrangement, after unscrewing the locking nut 512, when the sensor body 51 is screwed out from the first mounting hole 31 or the second mounting hole 32 (or when the sensor body 51 is screwed into the first mounting hole 31 or the second mounting hole 32), the cross cuts 121 on the circular rubber sheet 12 can frictionally clean the blank powder adhered to the detection head 52, preventing the blank powder from overly adhering to the detection head 52 and affecting the detection.
[0026] A filter 13 is provided on the gas delivery pipe 11. The filter 13 can filter the gas pumped out by the vacuum pump 4 from the vacuum feeding cylinder 2 and intercept the impurities contained in the pumped-out gas, preventing the impurities in the pumped-out gas from entering the interior of the vacuum pump 4 and affecting the service life of the vacuum pump 4.
[0027] In addition, it should be noted that for the specific embodiments described in this specification, the names of their respective parts, etc. can be different. Any equivalent or simple changes made according to the structure, features, and principles described in the inventive concept of the utility model patent are included within the protection scope of the utility model patent. Those skilled in the technical field to which the utility model belongs can make various modifications, supplements, or use similar methods for substitution to the specific embodiments described, as long as they do not deviate from the structure of the utility model or exceed the scope defined by this claim book, they should fall within the protection scope of the utility model.
Claims
1. An automatic feeding and warning device for the forming of a varistor body, comprising a feeding cylinder, a vacuum feeding cylinder, a storage cylinder and a vacuum pump. The discharge port of the feeding cylinder is connected to the feeding port of the vacuum feeding cylinder through a feeding pipe. The discharge port of the vacuum feeding cylinder is arranged on the feeding port of the storage cylinder, and an electric discharging valve is connected to the feeding port of the storage cylinder. The vacuum pump is connected to the vacuum feeding cylinder through an air conveying pipe. It is characterized in that: It further includes a feeding detection sensor, a low-level alarm sensor and a controller. The side wall of the storage cylinder is provided with a first mounting hole and a second mounting hole. The first mounting hole is arranged at a position close to the feeding port of the storage cylinder, and the second mounting hole is arranged at a position close to the discharging port of the storage cylinder. The feeding detection sensor is arranged in the first mounting hole, and the low-level alarm sensor is arranged in the second mounting hole. The detection heads of the feeding detection sensor and the low-level alarm sensor are both located in the storage cylinder; the controller is arranged on one side outside the storage cylinder. The feeding detection sensor and the low-level alarm sensor are both electrically connected to the control input end of the controller, and the vacuum pump and the electric discharging valve are both electrically connected to the control output end of the controller; the feeding detection sensor and the low-level alarm sensor are both capacitive proximity switches.
2. The automatic feeding and warning device for forming a varistor green body according to claim 1, wherein: The capacitive proximity switch includes a sensor body and a detection head. The sensor body is cylindrical. The outer wall of the sensor body is provided with external threads, and at least one locking nut matching the external threads is mounted on the outer wall of the sensor body. The first mounting hole and the second mounting hole are both provided with internal threads matching the external threads. The sensor body of the feeding detection sensor is mounted in the first mounting hole through the mutual cooperation of the external threads and the internal threads, and the sensor body of the low-level alarm sensor is mounted in the second mounting hole through the mutual cooperation of the external threads and the internal threads. The sensor body is locked on the storage cylinder through the locking nut.
3. The automatic feeding and warning device for forming a varistor green body according to claim 2, wherein: Two locking nuts matching the external threads are mounted on the outer wall of the sensor body. One locking nut is located inside the storage cylinder, and one locking nut is located outside the storage cylinder.
4. The automatic feeding and warning device for forming a varistor green body according to claim 2, wherein: Circular rubber sheets are mounted on the outer edge of the opening at the outer ends of the first mounting hole and the second mounting hole. A plurality of cross cuts are provided in the middle of the circular rubber sheets, and the sensor body is located in the cross cuts.
5. The automatic feeding and warning device for forming a varistor blank according to claim 1, characterized in that: A filter is provided on the air delivery pipe.