Powder material level detection device

Abstract

The utility model provides a powder material level detection device. The powder material level detection device comprises a material level detection device, a material level display device and a connecting rope, the material level detection device is arranged in the hopper, and the material level display device is arranged on the outer side of the hopper and connected with the material level detection device through a connecting rope. The material level detection device comprises a sliding rail, a sliding block and a baffle, the sliding rail is vertically arranged in the hopper, the sliding block is arranged on the sliding rail and can move in the axial direction of the sliding rail, the baffle is horizontally arranged on the sliding block, the sliding block is connected with the material level display device through a connecting rope, and the material level display device is connected with the baffle. The sliding height of the sliding block on the sliding rail can be detected in real time through the material level display device; and the material level display device can also control the movement of the sliding block through the connecting rope. Through mechanical linkage of the sliding block, the connecting rope and the stroke detection device, the defects that an electronic sensor is prone to being covered by dust, corroded by humidity, interfered by electromagnetic interference and the like are completely overcome, and the device is suitable for complex industrial scenes with dust, high temperature, high humidity and the like.

Description

Technical Field

[0001] This utility model relates to the field of detection devices, and in particular to a powder material level detection device. Background Technology

[0002] Existing diamond cutting tool raw materials are mainly produced by mixing various metal powders with diamond using mixing equipment. The finished diamond cutting tools are then manufactured through processes such as cold pressing, molding, and hot pressing. The cold pressing process is a crucial step in ensuring product quality. In industrial production, accurately determining the powder level in the cold press hopper is key to ensuring product stability and extending the lifespan of molds and equipment. Traditional powder level detection devices often use electronic detectors, such as ultrasonic sensors, capacitive sensors, and radar sensors. These devices face numerous challenges in practical applications. Cold pressing production is often accompanied by dust and machine vibration. These factors can significantly affect the performance of electronic detectors, leading to inaccurate data or even device malfunction. For example, dust accumulation may obscure the sensor surface, affecting its ability to receive and transmit signals; prolonged machine vibration can damage electronic components, rendering them inoperable.

[0003] Existing technology CN201620835057.8 discloses a movable dust level sensor based on a crank-slider mechanism, including a material tank, a crank-slider mechanism, and a detection mechanism. The crank-slider mechanism includes a motor, a crank, a connecting rod, a rocker arm, and a sliding component. The motor is fixedly connected to a support plate, the crank is fixedly connected to the motor's drive shaft, the other end of the crank is connected to the connecting rod, the connecting rod is connected to the rocker arm, the other end of the rocker arm is connected to the sliding component, a control box is mounted on the sliding component, and the sliding component is installed inside a guide plate. The detection mechanism includes a connecting rod, a signal transmitting coil, a signal receiving coil, and an iron core. The signal transmitting coil is fixedly connected to the iron core, the iron core is fixedly connected to the connecting rod, and the signal receiving coil is fixedly connected to the connecting rod. Although this solution can detect the material level height and the material level distribution in the material tank, it still has the following problems:

[0004] 1. The raw materials for producing diamond cutting tools are alloy powder and diamond. Therefore, the production environment is dusty. When the crank-slider mechanism operates in a dusty environment for a long time, the powder can easily penetrate the mechanical connection, leading to increased frictional resistance, accelerated wear of parts, and even jamming failure. The detection mechanism is easily covered or impacted by the powder, resulting in signal attenuation or structural damage. It needs to be disassembled, cleaned or replaced regularly, which is difficult to maintain.

[0005] 2. Due to the poor flowability of the raw materials, the hopper is designed to swing along with the movement of the scraper box. This swing helps to compact the raw materials, resulting in smaller fluctuations in the weight of the produced compacts. Existing testing devices cannot withstand the impact of the hopper's swing, which affects the testing accuracy.

[0006] 3. Due to the limited volume of the hopper, raw materials need to be added from time to time during the production process, and the same machine may produce multiple batches of raw materials per day. Therefore, the level gauge should be easy to disassemble and return to its original position so as not to affect the feeding. Utility Model Content

[0007] In view of this, the purpose of this utility model is to provide a powder level detection device that replaces the traditional electronic sensor with a mechanical detection structure (slider + connecting rope) to avoid the impact of dust and vibration interference on the detection accuracy.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A powder material level detection device is provided, comprising: a material level detection device, a material level display device, and a connecting rope; the material level detection device is disposed inside a hopper, and the material level display device is disposed outside the hopper and connected to the material level detection device via the connecting rope;

[0010] The material level detection device includes a slide rail, a slider, and a baffle. The slide rail is vertically installed inside the hopper, the slider is installed on the slide rail and can move along the slide rail axis, the baffle is horizontally installed on the slider, and the slider is connected to the material level display device through a connecting rope. The material level display device can detect the height of the slider sliding on the slide rail in real time. The material level display device can also control the movement of the slider through the connecting rope.

[0011] It should be noted that the material level detection device is entirely installed inside the hopper. It senses changes in the powder level by moving a slider on a slide rail. When the powder level in the hopper changes, the powder pushes or pulls the slider axially along the slide rail, thus detecting the material level. This method converts changes in material level into slider displacement, providing a more intuitive and mechanical way to detect the level. This avoids potential malfunctions of electronic sensors in complex industrial environments, improving the reliability and stability of the detection. The material level display device is located outside the hopper and is connected to the slider of the material level detection device via a connecting rope. As the slider moves on the slide rail, the connecting rope transmits the slider's displacement to the material level display device. The material level display device monitors the slider's movement on the slide rail in real time based on the movement of the connecting rope. The height of the slider is measured, thus displaying the material level information. This visually presents the material level in the hopper to the operator, allowing them to easily monitor the level and take timely actions, such as adding or stopping material feeding, improving the controllability of the production process. The connecting rope connects the material level detection device and the material level display device, transmitting the slider's displacement information on the slide rail to the material level display device. This enables information transmission between the two devices, allowing them to work collaboratively. The connecting rope is simple in structure, low in cost, and easy to install and maintain. Furthermore, the material level display device can actively control the slider's movement via the connecting rope (e.g., resetting or calibrating). The baffle, horizontally positioned above the slider, effectively prevents powder from accumulating around it. In industrial production environments, powder has high fluidity and scattering; without the baffle, it easily accumulates around the slider, reducing detection accuracy and affecting the detection effect.

[0012] Preferably, the material level display device includes a scale frame, a material level pointer, and a pointer groove; the scale frame is disposed on the outside of the hopper, and its upper end is provided with a steering pulley for a connecting rope to pass through; the pointer groove is disposed on the scale frame along the vertical axis, and a scale bar is provided on one side of the scale frame; the material level pointer is disposed in the pointer groove and can move along the pointer groove axis; the material level pointer is connected to the slider through a connecting rope, and can be driven to move along the pointer groove axis by the movement of the slider.

[0013] It should be noted that the scale frame is located on the outside of the hopper, serving as the supporting structure for the entire material level display device. It provides the mounting base for components such as the pointer groove, scale bar, and guide pulley, enabling these components to be assembled and work collaboratively. Simultaneously, the scale bar on the scale frame is used to indicate the material level height, visually displaying the material level information in conjunction with the material level pointer. The material level pointer is located within the pointer groove and can move axially along it. It is connected to the slider of the material level detection device via a connecting rope. When the slider moves on the slide rail due to changes in material level, the connecting rope drives the material level pointer to move within the pointer groove, and the scale indicated by the pointer is the current material level height. The guide pulley is located at the upper end of the scale frame, through which the connecting rope passes. Its function is to change the direction of the connecting rope, allowing it to smoothly extend from inside the hopper to the material level display device, thus realizing the connection and information transmission between the material level detection device and the material level display device.

[0014] Preferably, the fixed cover plate of the hopper has a positioning hole in the middle for the slide rail to pass through. A fixed sleeve for the slide rail to pass through is coaxially fixed to the positioning hole. The fixed sleeve is provided with a locking screw. The upper end of the slide rail passes through the positioning hole and is fixed to the fixed sleeve by the locking screw. A through hole for the connecting rope to pass through is provided on the fixed cover plate on one side of the positioning hole. A guide pulley for the connecting rope to pass through is provided on the fixed cover plate on the other side of the through hole.

[0015] It should be noted that the positioning hole is located in the middle of the fixed cover plate of the hopper. Its size is adapted to the slide rail, allowing the slide rail to pass through. Its function is to provide an accurate installation position for the slide rail, ensuring that the slide rail can be set vertically and stably in the hopper. The fixing sleeve is coaxially fixedly connected to the positioning hole and can also be passed through the slide rail. It acts as a reinforcing structure, increasing the contact area and connection strength between the slide rail and the fixed cover plate. After the slide rail passes through the fixing sleeve, the locking screws on the fixing sleeve can firmly fix the slide rail inside the fixing sleeve, preventing the slide rail from shaking during use. The movement or displacement of the guide pulley helps reduce the sliding error caused by the wobbling of the slide rail, improving the accuracy of material level detection. At the same time, the fixed sleeve provides a suitable installation position and fixing base for the locking screw. The guide pulley can change the direction of the connecting rope, allowing the connecting rope to connect more smoothly with the material level display device after passing through the fixed cover plate. This reduces the friction between the connecting rope and the fixed cover plate, reduces the wear of the connecting rope, and extends the service life of the connecting rope. In addition, the guide pulley makes the movement of the connecting rope smoother, improving the accuracy and stability of information transmission between the material level detection device and the material level display device.

[0016] Preferably, the slide rail is a circular straight rod with a guide groove on it corresponding to the locking screw along the slide rail axis. The lower end of the slide rail is provided with a limiting block to restrict the position of the slider. The slider is provided with a sliding hole for the slide rail to pass through. A guide key is provided in the sliding hole corresponding to the guide groove. The slider is sleeved on the slide rail through the sliding hole and can move along the slide rail axis. The slider is also prevented from rotating around the axis of the slide rail by the cooperation of the guide key and the guide groove.

[0017] It should be noted that the shape of the circular straight rod provides a smooth and regular sliding surface for the slider, allowing it to move smoothly along the axial direction of the slide rail. The straight rod's characteristics ensure that the slider's movement is always in a straight line, corresponding to the vertical change in material level, thus accurately reflecting the material level height. The guide groove is set along the axial direction of the slide rail and corresponds to the position of the locking screw. When the slider moves on the slide rail, the guide key on the slider will be embedded in the guide groove. The guide groove guides and constrains the guide key, ensuring that the slider can only move along the axial direction of the slide rail and will not rotate around the axis of the slide rail. The limit block is set at the lower end of the slide rail. When the slider moves downward as the material level drops and reaches a certain position, it will contact the limit block. The limit block prevents the slider from moving further downward, thus limiting the slider's position range.

[0018] Preferably, the fixed cover plate includes a fixed plate and a flip plate. The fixed plate covers the opening at the top of the hopper, and the flip plate is hinged to the fixed plate. The positioning hole is formed on the fixed plate.

[0019] It should be noted that the fixed plate covers the opening at the top of the hopper, providing the main support and sealing function for the entire fixed cover. It is a relatively fixed component, with positioning holes on the fixed plate for installing and fixing the slide rail, ensuring the slide rail can be stably positioned inside the hopper and providing accurate guidance for the movement of the slider. The flip plate is hinged to the fixed plate and can be flipped around the hinge axis. When it is necessary to inspect, clean, or maintain the inside of the hopper, the operator can open the flip plate for easy access; after the operation is completed, the flip plate is closed, restoring the hopper to its closed state. This greatly improves the maintainability and operability of the hopper. In industrial production, powder may accumulate inside the hopper, or malfunctions may occur, requiring regular inspection and cleaning. The flip plate makes these operations more convenient and quick, eliminating the need to disassemble the entire fixed cover, reducing maintenance time and workload, and improving production efficiency.

[0020] Preferably, the slider is provided with a hanging ring for fixing the connecting rope, the baffle is detachably mounted on the slider by rotating the pin, and the baffle is located on the opposite side of the flip plate.

[0021] It should be noted that the hanging ring is mounted on the slider and is mainly used to fix the connecting rope. One end of the connecting rope is connected to the hanging ring in a specific way (such as knotting, buckling, etc.). When the slider moves on the slide rail due to changes in material level, the connecting rope can move synchronously with the slider, thereby transmitting the slider's displacement information to the material level display device. The rotating pin is used to detachably mount the baffle on the slider. It connects the two by passing through corresponding holes on the baffle and the slider. When the baffle needs to be removed, simply pull out the rotating pin to remove the baffle from the slider. During installation, align the hole of the baffle with the hole of the slider and insert the rotating pin to complete the installation. At the same time, the rotating pin allows the baffle to rotate within a certain range to adapt to different working conditions. Placing the baffle on the opposite side of the tilting plate can avoid collision or damage to the baffle when opening the tilting plate for feeding, and it will not obstruct the operator's operating space. It protects the slider and connecting rope from the influence of powder, extends the service life of key components of the detection device, and improves the accuracy and stability of material level detection.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides a powder level detection device that, through the mechanical linkage of the level detection device, the level display device, and the connecting rope, avoids the defects of electronic sensors such as susceptibility to dust accumulation and vibration damage. It is suitable for complex industrial scenarios with dust and vibration. Furthermore, the detection device is always positioned above the powder, avoiding detection failure caused by material adhesion or wear, resulting in a long service life. By abandoning electronic sensors, the level display device adopts a design of a scale frame and a level pointer. The level pointer is set along the axial direction of the scale frame, allowing operators to directly and intuitively read the powder level height by observing the position of the level pointer on the scale frame. This eliminates the need for complex electronic equipment and data processing, making operation simple and easy to understand. The level display is intuitive and clear. Moreover, the purely mechanical display solution of the scale frame and level pointer does not rely on electricity or complex electrical control systems, significantly reducing equipment costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of a powder level detection device according to Embodiment 1 of this utility model.

[0025] Figure 2 This is a schematic diagram of the internal structure of a powder level detection device according to Embodiment 1 of this utility model.

[0026] Figure 3 This is a schematic diagram of the slide bar structure of Embodiment 1 of this utility model.

[0027] Figure 4 This is a schematic diagram of the structure of the fixed cover plate in Embodiment 1 of this utility model.

[0028] Figure 5This is a schematic diagram of the slider in Embodiment 1 of this utility model.

[0029] In the diagram: 100, Material level detection device; 110, Slide rail; 111, Guide groove; 112, Limiting block; 120, Sliding block; 121, Sliding hole; 122, Guide key; 130, Baffle; 140, Rotating pin; 200, Material level display device; 210, Scale frame; 211, Steering pulley; 212, Scale bar; 220, Material level pointer; 230, Pointer groove; 300, Connecting rope; 400, Hopper; 410, Fixed cover plate; 411, Fixed plate; 412, Flip plate; 413, Hinge; 414, Through hole; 415, Guide pulley; 500, Fixed sleeve; 510, Locking screw.

[0030] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0031] 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.

[0032] Example 1

[0033] like Figures 1-5 As shown, a powder material level detection device includes: a material level detection device 100, a material level display device 200, and a connecting rope 300; the material level detection device 100 is disposed inside a hopper 400, and the material level display device 200 is disposed outside the hopper 400 and connected to the material level detection device 100 via the connecting rope 300.

[0034] The material level detection device 100 includes a slide rail 110, a slider 120, and a baffle 130. The slide rail 110 is vertically arranged inside the hopper 400. The slider 120 is arranged on the slide rail 110 and can move along the axial direction of the slide rail 110. The baffle 130 is horizontally arranged on the slider 120. The slider 120 is connected to the material level display device 200 through a connecting rope 300, and the material level display device 200 can detect the height of the slider 120 sliding on the slide rail 110 in real time. The material level display device 200 can also control the movement of the slider 120 through the connecting rope 300.

[0035] The material level display device 200 includes a scale frame 210, a material level pointer 220, and a pointer groove 230. The scale frame 210 is located outside the hopper 400, and its upper end is provided with a guide pulley 211 through which the connecting rope 300 passes. The pointer groove 230 is located on the scale frame 210 along the vertical axis of the scale frame 210, and a scale bar 212 is provided on one side of the scale frame 210. The material level pointer 220 is located in the pointer groove 230 and can move along the pointer groove 230 axially. The material level pointer 220 is connected to the slider 120 through the connecting rope 300, and can be driven to move along the pointer groove 230 axially by the movement of the slider 120.

[0036] The hopper 400 has a positioning hole in the middle of the fixed cover plate 410 for the slide rail 110 to pass through. A fixed sleeve 500 for the slide rail 110 to pass through is coaxially fixed to the positioning hole. The fixed sleeve 500 is provided with a locking screw 510. The upper end of the slide rail 110 passes through the positioning hole and is fixed to the fixed sleeve 500 by the locking screw 510. A through hole 414 for the connecting rope 300 to pass through is provided on the fixed cover plate 410 on one side of the positioning hole. A guide pulley 415 for the connecting rope 300 to pass through is provided on the fixed cover plate 410 on the other side of the through hole 414.

[0037] The slide rail 110 is a circular straight rod, and a guide groove 111 is provided on it along the axial direction of the slide rail 110 corresponding to the locking screw 510. The lower end of the slide rail 110 is provided with a limiting block 112 to restrict the position of the slider 120. The slider 120 is provided with a sliding hole 121 for the slide rail 110 to pass through. A guide key 122 is provided in the sliding hole 121 corresponding to the guide groove 111. The slider 120 is sleeved on the slide rail 110 through the sliding hole 121 and can move along the axial direction of the slide rail 110. The slider 120 is also prevented from rotating around the axis of the slide rail 110 by the cooperation of the guide key 122 and the guide groove 111.

[0038] The fixed cover plate 410 includes a fixed plate 411 and a flip plate 412. The fixed plate 411 covers the opening at the top of the hopper 400. The flip plate 412 is hinged to the fixed plate 411 via a hinge 413. The positioning hole is opened on the fixed plate 411.

[0039] The slider 120 is provided with a hanging ring for fixing the connecting rope 300. The baffle 130 is detachably mounted on the slider 120 by rotating the pin 140, and the baffle 130 is located on the opposite side of the flip plate 412.

[0040] The working principle and usage method of a powder level detection device in this embodiment are as follows:

[0041] This embodiment provides a powder level detection device. The hopper 400 is used to store powder, and the powder accumulation height inside the hopper will change. The slide rail 110 is vertically installed inside the hopper 400, providing a unique movement path for the slider 120, so that the slider 120 can only move in the vertical direction. When the powder level in the hopper 400 changes, the powder will support or block the slider 120. When the powder decreases, the slider 120 moves downward under its own gravity. One end of the connecting rope 300 is connected to the slider 120, and the other end passes through the through hole 414 on the fixed cover plate 410 and the guide pulley 415, and then passes through the steering pulley 211 on the scale frame 210 to connect with the material level pointer 220. When the slider 120 moves on the slide rail 110, the connecting rope 300 moves accordingly, which in turn drives the level pointer 220 to move within the pointer groove 230, thus realizing the function of transmitting the displacement information of the slider 120 to the level display device 200. The scale bar 212 on the scale frame 210 marks different level heights. Driven by the connecting rope 300, the level pointer 220 moves axially along the pointer groove 230, and the scale value it indicates is the current height of the slider 120 on the slide rail 110, which is the level height of the powder in the hopper 400. The operator can directly read this value to obtain the level information. The positioning hole and the fixing sleeve 500 provide precise installation positioning for the slide rail 110. The slide rail 110 is firmly fixed by the locking screw 510 to prevent it from shaking or shifting. The cooperation between the guide groove 111 and the guide key 122 ensures that the slider 120 does not rotate around the axis when moving along the slide rail 110, thus ensuring the movement of the slider 120. Stability and detection accuracy; the limiting block 112 at the lower end of the slide rail 110 restricts the downward movement range of the slider 120, preventing the slider 120 from disengaging from the slide rail 110; the flip plate 412 of the fixed cover plate 410 is connected to the fixed plate 411 via the hinge 413, and can rotate around the axis. When it is necessary to add, inspect, clean or maintain materials inside the hopper 400, the flip plate 412 can be opened for convenient operation; after the flip plate 412 is closed, the sealing of the hopper 400 is ensured, preventing powder leakage; the hanging ring on the slider 120 is used to securely connect the connecting rope 300, ensuring stable information transmission; the baffle 130 is detachably installed on the slider 120 by rotating the pin 140 and is located on the opposite side of the flip plate 412. It can prevent powder from accumulating around the slider 120 and affecting the detection accuracy, and can also avoid collision damage when the flip plate 412 is opened, protecting the slider 120 and the connecting rope 300, and extending the service life of key components of the detection device.

[0042] In use, first pass the circular straight rod slide rail 110 through the positioning hole of the fixed cover plate 410 of the hopper 400 and the fixed sleeve 500, and fix it with the locking screw 510 to ensure that the slide rail 110 is vertical. Put the slider 120 on the slide rail 110 so that the guide key 122 in the sliding hole 121 is embedded in the guide groove 111. Check whether the slider 120 can slide up and down smoothly. Fix one end of the connecting rope 300 to the hanging ring of the slider 120, and pass the other end through the through hole 414 of the fixed cover plate 410, the guide pulley 415, and the steering pulley 211 on the scale frame 210 in sequence, and connect it to the material level pointer 220. Then install the baffle 130 on the slider 120 by rotating the pin 140 and adjust it to a horizontal state. Then, when the hopper 400 is unloaded, manually lift the slider 120 to the slide rail 110. At the top of 0, the material level pointer 220 should point to the zero point of the scale bar 212 to complete the initial calibration and ensure the accuracy of the test data. Then, fill the hopper 400 with powder to the maximum designed height, release the material level pointer 220 to allow the slider 120 to move freely. During the production process, as the powder is discharged, the material level drops, and the slider 120 moves downward accordingly. The material level pointer 220 synchronously indicates the current material level, and the operator can read the material level value from the scale bar 212 at any time. Finally, mark the low material level warning line on the scale bar 212 according to the production requirements. When the material level pointer 220 approaches the warning line, manually start the feeding process. Before feeding, manually pull the connecting rope 300 to raise the slider 120 to the top of the slide rail 110 to avoid the impact of powder during feeding, which would cause the slider 120 to shake violently and affect the detection accuracy.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is used only to illustrate the technical solution of this utility model, and is not intended to limit the protection scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the protection scope of this utility model.

[0044] In the description of this utility model, it should be understood that the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

Claims

1. A powder level detection apparatus comprising: A material level detection device (100), a material level display device (200), and a connecting rope (300); the material level detection device (100) is disposed inside a hopper (400), and the material level display device (200) is disposed outside the hopper (400) and connected to the material level detection device (100) via the connecting rope (300); characterized in that: The material level detection device (100) includes a slide rail (110), a slider (120), and a baffle (130). The slide rail (110) is vertically arranged inside the hopper (400). The slider (120) is arranged on the slide rail (110) and can move axially along the slide rail (110). The baffle (130) is horizontally arranged on the slider (120). The slider (120) is connected to the material level display device (200) through a connecting rope (300) and can detect the height of the slider (120) sliding on the slide rail (110) in real time through the material level display device (200). The material level display device (200) can also control the movement of the slider (120) through the connecting rope (300).

2. A powder level detection device as claimed in claim 1, characterized in that: The material level display device (200) includes a scale frame (210), a material level pointer (220), and a pointer groove (230). The scale frame (210) is located outside the hopper (400), and its upper end is provided with a steering pulley (211) through which a connecting rope (300) passes. The pointer groove (230) is located on the scale frame (210) along the vertical axis of the scale frame (210), and a scale bar (212) is provided on one side of the scale frame (210). The material level pointer (220) is located in the pointer groove (230) and can move along the pointer groove (230) axially. The material level pointer (220) is connected to the slider (120) through the connecting rope (300), and can be driven to move along the pointer groove (230) axially by the movement of the slider (120).

3. A powder level detection apparatus as claimed in claim 2, characterised in that: The hopper (400) has a positioning hole in the middle of the fixed cover plate (410) for the slide rail (110) to pass through. A fixed sleeve (500) for the slide rail (110) to pass through is coaxially fixed to the positioning hole. The fixed sleeve (500) is provided with a locking screw (510). The upper end of the slide rail (110) passes through the positioning hole and is fixed to the fixed sleeve (500) by the locking screw (510). A through hole (414) for the connecting rope (300) to pass through is provided on the fixed cover plate (410) on one side of the positioning hole. A guide pulley (415) for the connecting rope (300) to pass through is provided on the fixed cover plate (410) on one side of the through hole (414).

4. A powder level detection apparatus as claimed in claim 3, characterised in that: The slide rail (110) is a circular straight rod, and a guide groove (111) is provided on it along the axial direction of the slide rail (110) corresponding to the locking screw (510). The lower end of the slide rail (110) is provided with a limiting block (112) to limit the position of the slider (120). The slider (120) is provided with a sliding hole (121) through which the slide rail (110) passes. A guide key (122) is provided in the sliding hole (121) corresponding to the guide groove (111). The slider (120) is sleeved on the slide rail (110) through the sliding hole (121) and can move along the axial direction of the slide rail (110). The slider (120) is also prevented from rotating around the axis of the slide rail (110) by the cooperation of the guide key (122) and the guide groove (111).

5. The powder level detection device as described in claim 3, characterized in that: The fixed cover plate (410) includes a fixed plate (411) and a flip plate (412). The fixed plate (411) covers the opening at the top of the hopper (400). The flip plate (412) is hinged to the fixed plate (411) by a hinge (413). The positioning hole is opened on the fixed plate (411).

6. A powder level detection apparatus as claimed in claim 5, characterised in that: The slider (120) is provided with a hanging ring for fixing the connecting rope (300). The baffle (130) is detachably mounted on the slider (120) by rotating the pin (140), and the baffle (130) is located on the opposite side of the flip plate (412).

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