Sampling lance position detection device for grain sampling machine

Abstract

The utility model discloses a sampling lance position detection device of grain sampling machine, including sampling machine, and sampling machine includes stand, rotating mechanism, controller, and rotating mechanism includes rotating arm, is equipped with the moving trolley of sampling on rotating arm, is equipped with lance on rotating arm, is equipped with the lance position detection mechanism of detecting the up and down movement position of lance on moving trolley, the lower part of moving trolley is equipped with upper limit switch, hindrance switch, and the middle part is equipped with the lance driving mechanism of driving lance up and down movement, upper limit switch, hindrance switch, lance driving device, lance position detection mechanism are connected with controller respectively with electric signal. According to actual state control lance rises, falls or pause, uses lance action to be controlled, and sampling control is more flexible, accurate, can accurately judge and determine lance state and movement position, avoid lance to break the bottom of car, lance to reach the problem such as the obstacle leakage lance in the falling process.

Description

Technical Field

[0001] This utility model relates to the technical field of bulk material sampling equipment, and in particular to a sampling rod position detection device for a grain sampler. Background Technology

[0002] Grain samplers are commonly used bulk material sampling equipment, primarily used in grain depots or grain processing enterprises to sample bulk grain loaded onto trucks. The most common type is the stationary grain sampler, which mainly includes a sampler column, rotating arm, moving trolley, shovel, grain suction machine, pipelines, and an electrical control system (or controller). It is generally operated manually using a remote control or joystick, controlling the position and height of the rotating arm, moving trolley, and shovel during sampling to actually sample grain from different locations inside the truck. Furthermore, existing electrical control systems can automatically select the sampling point for sampling. The dynamic sampling method requires minimal manual operation, preventing cheating during the sampling process. However, because the rod position still relies on point-based detection methods such as limit switches, proximity switches, and overcurrent switches for high and low limit detection and vehicle undercarriage detection, the electrical control system cannot continuously detect the accurate position of the rod. During rod lifting control, it can only repeatedly run back and forth between the highest point and the vehicle undercarriage. Furthermore, due to the influence of the rod drive device, the rod runs at different speeds under different conditions, making it impossible to estimate the rod position based on the running time. This leads to problems such as damaging the vehicle undercarriage or missing the rod when encountering obstacles during descent.

[0003] How to accurately detect the position of the sampling rod and thus accurately determine its status has become an urgent problem to be solved in the control of grain sampling machines in order to improve the level of automatic sampling control. Utility Model Content

[0004] This invention aims to overcome the shortcomings of existing technologies by providing a sampling rod position detection device for a grain sampling machine. The invention features a rod position detection mechanism on a moving trolley to detect the vertical movement of the sampling rod. The lower part of the trolley has an upper limit switch and an obstruction switch, while the middle part has a rod drive mechanism to drive the rod's vertical movement. The upper limit switch, obstruction switch, rod drive mechanism, and rod position detection mechanism are all electrically connected to a controller. The device controls the rod's ascent, descent, or pause based on the actual situation, making the rod's movement more controlled, resulting in more flexible and accurate sampling control. It can accurately determine the rod's state and position, preventing problems such as damage to the trolley's undercarriage or missed sampling due to obstacles during descent.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A sampling rod position detection device for a grain sampling machine includes a sampling machine, which includes a column, a rotating mechanism, and a controller connected in sequence. The rotating mechanism includes a rotating arm, on which a sampling trolley is mounted. The trolley is connected to a horizontal moving structure on the rotating arm. A sampling rod is mounted on the rotating arm. The controller controls the movement of the lifting mechanism, the rotating mechanism, the rotating arm, and the trolley. The trolley is equipped with a sampling rod position detection mechanism for detecting the vertical movement of the sampling rod. The lower part of the trolley is equipped with an upper limit switch and an obstruction switch, and the middle part is equipped with a sampling rod driving mechanism for driving the sampling rod to move up and down. The upper limit switch, the obstruction switch, the sampling rod driving mechanism, and the sampling rod position detection mechanism are all electrically connected to the controller.

[0006] The rod position detection mechanism includes a synchronous wheel, an encoder, and a bracket. The encoder is electrically connected to the controller. One end of the bracket is connected to the housing of the mobile trolley, and the other end is provided with a rotating shaft. The rotating shaft can rotate around its own axis on the bracket. The synchronous wheel is connected to one end of the rotating shaft, and the encoder is connected to the other end of the rotating shaft. The synchronous wheel is in close contact with the rod, and when the rod moves, it drives the synchronous wheel to rotate simultaneously.

[0007] The encoder and controller are connected by a signal cable to detect the angular displacement of the synchronous pulley.

[0008] The mounting bracket adopts a flexible plate structure.

[0009] The rotating arm is provided with a connecting block, and the connecting block is provided with a connecting hole with an open slot on one side. The pin shaft is engaged with the connecting hole of the connecting block. The bracket is fixedly connected to the pin shaft. A vertical locking hole is provided at the position of the open slot. The locking hole is engaged with the nut and bolt assembly; or the locking hole is a threaded hole, which is engaged with the screw.

[0010] The timing pulley is made of polyurethane or stainless steel.

[0011] The surface of the synchronous pulley that contacts the skewer is a concave arc groove that mates with the skewer surface.

[0012] The beneficial effects of this utility model are: 1. The sampling rod position detection device of this utility model for a grain sampling machine includes a rod position detection mechanism on a moving trolley for detecting the up-and-down movement of the rod. The lower part of the moving trolley has an upper limit switch and an obstruction switch, and the middle part has a rod drive mechanism for driving the rod up and down. The upper limit switch, obstruction switch, rod drive mechanism, and rod position detection mechanism are all electrically connected to a controller. The device controls the rod to rise, fall, or pause according to the actual situation, ensuring controlled rod movement and preventing issues such as bottoming out of the sampling trolley or missed sampling. This makes sampling control more flexible and accurate. The controller, equipped with position calibration and zero-position buttons, can more accurately determine the rod position.

[0013] 2. In this invention, the synchronous pulley and the skewer are in contact and cooperate. When the skewer rises or falls, the synchronous pulley rotates synchronously, converting the linear displacement of the skewer into angular displacement. The encoder and controller are connected by a signal cable to detect the angular displacement of the synchronous pulley. The controller detects the encoder signal and determines the position of the skewer. By detecting the angular displacement signal output by the encoder and the angular change, the position of the skewer is determined. By determining the state and position of the skewer, the movement of the skewer can be controlled more flexibly and accurately.

[0014] 3. This utility model employs a rod position detection mechanism with an encoder to detect the up-and-down movement of the rod. It uses a rod position detection sensor with an encoder to accurately detect the rod's position. Combined with existing upper limit switches, obstruction switches, micro switches, etc., and controlled by a controller, it can accurately determine the rod's state and position, preventing damage to the vehicle's undercarriage or missed stops due to obstacles during descent.

[0015] 4. The bracket of this utility model adopts an elastic plate structure. By using an elastic plate structure for the mounting bracket, and employing springs or sheet metal, the elastic force forces the synchronous pulley and the spur rod to fit more tightly, resulting in better synchronization. If a spring steel plate, tension spring, or other elastically deformable structure is used, gravity and elastic force are simultaneously utilized to reliably press the synchronous pulley against the contact surface of the spur rod, thereby ensuring that the two are reliably and tightly fitted together, operating in accurate synchronization.

[0016] 5. The rotating arm of this utility model is provided with a connecting block, and the connecting block has a connecting hole with an open slot on one side. The pin shaft cooperates with the connecting hole of the connecting block, and the bracket is fixedly connected to the pin shaft. A vertical locking hole is provided at the position of the open slot. The locking hole cooperates with the nut and bolt assembly to fix the pin shaft and the connecting block; or the locking hole is a threaded hole, which cooperates with a screw to fix the pin shaft and the connecting block. This allows for easy disassembly and installation of the connected structures, facilitating use, maintenance, and replacement.

[0017] 6. The synchronous pulley of this invention is made of polyurethane or stainless steel, which has good hardness and wear resistance. This ensures accuracy and service life while reducing usage and maintenance costs.

[0018] 7. In this invention, the surface of the synchronous pulley that contacts the skewer is a concave arc groove that mates with the skewer surface. By employing an arc groove structure, the contact surface with the skewer is increased, providing positioning and guiding functions, ensuring high movement and detection accuracy, and preventing the synchronous pulley from disengaging from the skewer. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 1 ; Figure 2 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 2 ; Figure 3 This is a schematic diagram of the structure of an embodiment of the present utility model. Figure 3 .

[0020] 1. Stub; 2. Stub position detection mechanism; 21. Synchronous pulley; 22. Encoder; 23. Bracket; 24. Rotating shaft; 25. Connecting block; 26. Opening slot; 27. Pin; 28. Connecting hole; 29. ​​Locking hole; 3. Upper limit switch; 31. Elastic plate; 4. Obstruction switch; 5. Stub drive mechanism; 6. Controller; 7. Moving trolley; 71, 72. Car body connecting holes; 8. Rotating arm; 9. Column. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0022] like Figure 1-3 As shown, a sampling rod position detection device for a grain sampler is disclosed. The grain sampler includes a column 9, a rotating mechanism, and a controller 6 connected in sequence. The rotating mechanism includes a rotating arm 8, which is connected to the column 9 and can rotate around the column 9. A trolley running track is provided on the rotating arm 8. A moving trolley 7 cooperates with the running track and can move horizontally in the back-and-forth direction on the running track. The moving trolley 7 includes a body 71, on which a body connecting hole 72 is provided. A sliding sleeve can be installed on the body connecting hole. A cylindrical track is provided on the rotating arm. The sliding sleeve cooperates with the cylindrical track to ensure smooth and reliable movement.

[0023] The controller 6 is electrically connected to the rotating mechanism and the moving trolley, controlling the movements of the rotating mechanism, rotating arm, and moving trolley. The moving trolley is equipped with a rod drive mechanism 5 that drives the rod 1 to move up and down. The rod drive mechanism 5 is used to drive the rod 1 to rise or fall and to perform sampling. The rod drive mechanism 5 includes a motor reducer and drive rollers mounted on the moving trolley 7, which cooperate with the rod. Specifically, it adopts a drive mechanism based on existing technology. The rod drive mechanism 5 is located in the middle of the moving trolley. The rod drive mechanism 5 is electrically connected to the controller 6 to control its movement.

[0024] The sampling rod position detection device includes an upper limit switch 3, an obstruction switch 4, and a rod position detection mechanism 2. The upper limit switch 3, the obstruction switch 4, and the rod position detection mechanism 2 are respectively connected to the moving trolley. The rod position detection mechanism 2 is used to detect the vertical movement position of the rod. The rod position detection mechanism 2, the upper limit switch 3, and the obstruction switch 4 are respectively electrically connected to the controller 6. The upper limit switch 3 is located at the lower part of the moving trolley, the obstruction switch 4 is located at the upper part of the moving trolley, and the rod position detection mechanism 2 is located between the upper limit switch 3 and the obstruction switch 4.

[0025] The upper limit switch 3 is a limit switch or a general limit switch.

[0026] The obstruction switch 4 is used to detect whether the rod encounters an obstacle during its descent, and is also called an obstacle switch. The obstruction switch 4 adopts an overcurrent relay, a micro switch, or a magnetic proximity switch.

[0027] When the upper limit switch 3 detects that the rod 1 has reached its upper limit, the upper limit switch 3 and the rod 1 disengage. The obstruction switch 4 detects that the rod 1 has encountered an obstacle such as the vehicle floor or crossbeam during descent and cannot continue descending. If an overcurrent relay is used, when the rod encounters an obstacle and cannot descend, the motor current driving the rod suddenly increases, triggering the overcurrent relay and confirming the obstacle encounter. If a microswitch is used, when the rod encounters an obstacle, the rotating arm and trolley experience a reaction force, moving upwards as a whole, generating significant vibration, triggering the microswitch and confirming the obstacle encounter. When a magnetic proximity switch is used, a magnetic switch is installed at the bottom of the rod. When it approaches the vehicle floor or a metal obstacle, the switch activates, confirming the obstacle encounter.

[0028] The upper limit switch 3 is provided with an elastic plate 31, which is in contact with the rod 1. The elasticity of the elastic plate 31 ensures that the upper limit switch 3 and the rod 1 maintain close and reliable contact when contact is required.

[0029] The rod position detection mechanism 2 includes a synchronous wheel 21, an encoder 22, and a bracket 23. The encoder 22 is electrically connected to the controller and is a rotary encoder. One end of the bracket 23 is connected to the housing of the mobile trolley 7, and the other end is provided with a rotating shaft 24. The rotating shaft 24 can rotate around its own axis on the bracket 23. The synchronous wheel 21 is connected to one end of the rotating shaft, and the encoder 22 is connected to the other end of the rotating shaft. The synchronous wheel 21 is in close contact with the rod 1. When the rod 1 rises or falls, the synchronous wheel 21 rotates synchronously, converting the linear displacement of the rod 1 into angular displacement. The encoder 22 is connected to the controller 6 via a signal cable to detect the angular displacement of the synchronous wheel 21.

[0030] The bracket 23 adopts an elastic plate structure, and the mounting bracket 23 is made of spring or spring sheet material. The elastic force forces the synchronous wheel 21 to fit more tightly with the rod 1, resulting in better synchronization. If a structure with elastic deformation such as spring steel plate or aluminum plate is used, the weight and elastic force of the bracket 23 are used to reliably press the synchronous wheel 21 against the contact surface of the rod 1, thereby ensuring that the two are reliably and tightly attached together and operate synchronously and accurately.

[0031] The rotating arm is provided with a connecting block 25, and the connecting block 25 is provided with a connecting hole 28 with an opening groove 26 on one side. The pin shaft cooperates with the connecting hole 28 of the connecting block. The bracket 23 is fixedly connected to the pin shaft 27. A vertical locking hole 29 is provided at the opening groove position. The locking hole 29 cooperates with the nut bolt assembly to fix the pin shaft and the connecting block reliably; or the locking hole is a threaded hole, which cooperates with the screw to fix the pin shaft and the connecting block reliably.

[0032] The synchronous pulley 21 is made of a material with high hardness, wear resistance and aging resistance. Preferably, it can be a polyurethane wheel or a stainless steel wheel with good hardness and wear resistance.

[0033] The surface of the synchronous pulley 21 that contacts the skewer 1 is a concave arc groove that mates with the surface of the skewer 1. By adopting the arc groove structure, firstly, the contact surface with the skewer 1 is increased, and secondly, it plays a positioning and guiding role, preventing the synchronous pulley 21 from disengaging from the skewer 1.

[0034] The use and working principle of this utility model: The controller detects and determines the position of the cutting rod by monitoring the encoder signal, specifically by detecting the angular displacement signal output by encoder 22 and determining the cutting rod position based on the angle change. To further refine the cutting rod position, the controller includes position calibration and reset buttons. By determining the cutting rod's state and position, the controller can control its movement more flexibly and accurately. The controller 6 can set the upper limit of the cutting rod position and the floor limit data. If the cutting rod position exceeds the upper limit, the controller stops the cutting rod from rising; if the cutting rod position exceeds the floor limit, the controller stops the cutting rod from descending. If the controller 6 receives a signal from obstacle switch 4 indicating an obstacle encounter, it determines whether the current position is at the floor limit or has encountered an obstacle higher than the floor. If it has encountered the floor, the controller memorizes the floor limit data; if it has encountered an obstacle, the controller can control the cutting rod 1 to avoid the obstacle and perform another cutting attempt. Based on the actual situation, the rod can be controlled to rise, fall, or pause, making the rod operation completely controllable and avoiding situations such as hitting the bottom of the vehicle or missing the rod. The sampling control is more flexible and accurate.

[0035] In the description of this utility model, the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and do not require that this utility model be constructed or operated in a specific orientation, and therefore should not be construed as limiting this utility model. The terms "connected" and "linked" in this utility model should be interpreted broadly. For example, they can refer to a connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0036] The above description represents the preferred embodiments of this utility model. The specific embodiments are provided only for a better understanding of the concept of this utility model. For those skilled in the art, several improvements or equivalent substitutions can be made based on the principles of this utility model, and these improvements or equivalent substitutions are also considered to fall within the protection scope of this utility model.

Claims

1. A sampling rod position detection device for a grain sampler, the grain sampler comprising a column, a rotating mechanism, and a controller, the rotating mechanism comprising a rotating arm connected to the column and capable of rotating around the column, the rotating arm having a trolley running track, the trolley moving horizontally in the back-and-forth direction on the running track; the controller being electrically connected to the rotating mechanism and the trolley, the trolley having a rod driving mechanism for driving the sampling rod to move up and down; characterized in that, The sampling rod position detection device includes an upper limit switch, an obstruction switch, and a rod position detection mechanism. The upper limit switch, obstruction switch, and rod position detection mechanism are respectively connected to the moving trolley. The rod position detection mechanism is used to detect the vertical movement position of the rod. The rod position detection mechanism, the upper limit switch, and the obstruction switch are respectively connected to the controller electrical signal. The upper limit switch is located at the lower part of the moving trolley, the obstruction switch is located at the upper part of the moving trolley, and the rod position detection mechanism is located between the upper limit switch and the obstruction switch.

2. The sampling rod position detection device for a grain sampler according to claim 1, characterized in that, The upper limit switch is a limit switch or a general limit switch.

3. The sampling rod position detection device for a grain sampler according to claim 2, characterized in that, The upper limit switch is equipped with an elastic plate that contacts and engages with the rod.

4. The sampling rod position detection device for a grain sampler according to claim 1, characterized in that, The blocking switch is an overcurrent relay, a micro switch, or a magnetic proximity switch.

5. The sampling rod position detection device for a grain sampler according to claim 1, characterized in that, The rod position detection mechanism includes a synchronous pulley, an encoder, and a bracket. The encoder is electrically connected to the controller and is a rotary encoder. One end of the bracket is connected to the housing of the mobile trolley, and the other end is equipped with a rotating shaft that can rotate around its own axis on the bracket. The synchronous pulley is connected to one end of the rotating shaft, and the encoder is connected to the other end of the rotating shaft. The synchronous pulley is in contact with the rod. When the rod rises or falls, the synchronous pulley rotates synchronously, converting the linear displacement of the rod into angular displacement. The encoder is connected to the controller via a signal cable to detect the angular displacement of the synchronous pulley.

6. The sampling rod position detection device for a grain sampler according to claim 5, characterized in that, The support structure adopts an elastic plate structure.

7. The sampling rod position detection device for a grain sampler according to claim 5, characterized in that, The rotating arm is provided with a connecting block, and the connecting block is provided with a connecting hole with an open slot on one side. The pin shaft is engaged with the connecting hole of the connecting block. The bracket is fixedly connected to the pin shaft. A vertical locking hole is provided at the position of the open slot. The locking hole is engaged with the nut and bolt assembly to fix the pin shaft and the connecting block; or the locking hole is a threaded hole, which is engaged with a screw to fix the pin shaft and the connecting block.

8. The sampling rod position detection device for a grain sampler according to claim 5, characterized in that, The synchronizing pulley is made of polyurethane or stainless steel with good hardness and wear resistance.

9. The sampling rod position detection device for a grain sampler according to claim 5, characterized in that, The surface of the synchronous pulley that contacts the skewer is an inwardly concave arc groove that mates with the skewer surface.

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