Lifting rod with magnetic limit switch and control method

Abstract

The lifting rod with the magnetic limiting switch comprises a bottom pipe, a top pipe, a first inner pipe, a second inner pipe, a driving mechanism, a controller and a magnetic limiting stopper, the top pipe, the second inner pipe, the first inner pipe and the bottom pipe are connected in a sleeved mode from top to bottom at a time, and the driving mechanism is arranged in the bottom pipe and used for driving the top pipe, the second inner pipe and the first inner pipe to move. The lifting rod is extended or shortened; the controller is electrically connected with the magnetic limiting device and the driving mechanism and used for detecting whether the lifting rod reaches the upper limiting position or the lower limiting position or not through the magnetic limiting switch and controlling the driving mechanism to stop working.

Description

Technical Field

[0001] The invention relates to the technical field of lifting rods, and in particular to a lifting rod with a magnetic limit switch and a control method thereof. Background Art

[0002] The lifting rod is mainly used in the wireless communication of motor vehicles. When the communication vehicle is stationed, the antenna or outdoor unit is raised to a suitable height to improve the communication quality and extend the communication distance.

[0003] Commonly used lifting rod limiters are contact limiters or proximity limiters, which have a short action distance and cannot be separated by metal, etc. Figure 1 As shown, especially when the lower limit of the section-by-section lifting rod adopts a contact limiter or a proximity limiter, a relay sliding touch rod is required to be set on each section of the pipe sleeve, and the information of the top pipe in place is transmitted to the limit switch of the bottom pipe through the relay sliding touch rod. The lower limit switch mainly controls the motor to stop moving when the top pipe descends to the lowest position; the working process is: when the top pipe descends to the lowest height, the lower edge of the top pipe triggers the first, second, third... touch rods in sequence through the spring mechanism, and finally triggers the lower limit switch, so that the lower limit switch generates a signal.

[0004] However, the above lifting rods have the following main disadvantages:

[0005] 1. After long-term use, the trigger position may move or fail due to deformation of the tube;

[0006] 2. The assembly tolerance of the pipe body, the gap between them, the cumulative tolerance, etc. will lead to limit failure;

[0007] 3. The failure or jamming of the spring may easily lead to the failure of the trigger rod to make continuous contact, thus causing the trigger to fail.

[0008] 4. Complex structure, low reliability, poor processability, large size and high cost. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides a lifting rod with a magnetic limit switch and a control method, which solves the problems in the prior art.

[0010] According to an embodiment of the present invention, a lifting rod with a magnetic limit switch and a control method thereof, a bottom tube, a top tube, a first inner tube, a second inner tube, a driving mechanism, a controller and a magnetic limiter, the top tube, the second inner tube, the first inner tube and the bottom tube are sleeved from top to bottom, the driving mechanism is arranged in the bottom tube, and is used to drive the top tube, the second inner tube and the first inner tube to move, so that the lifting rod is extended or shortened;

[0011] The controller is electrically connected to the magnetic limit switch and the driving mechanism respectively, and is used to detect whether the lifting rod reaches the upper limit or the lower limit through the magnetic limit switch, and control the driving mechanism to stop working.

[0012] As an embodiment of the present invention, the magnetic limiter includes: a magnetic proximity switch, a first magnetic steel and a second magnetic steel, the magnetic proximity switch is arranged on the outer wall of the bottom tube, the first magnetic steel is arranged on the inner wall of the top tube, the second magnetic steel is arranged on the inner wall of the first inner tube, and the magnetic proximity switch is respectively adapted to the first magnetic steel and the second magnetic steel;

[0013] The magnetic proximity switch includes: a high-precision magnetic field detection and recording component, which is electrically connected to the controller and is used to detect the magnetic field strength in real time, obtain real-time field strength data and record it;

[0014] The comparator is electrically connected to the high-precision magnetic field detection and recording component and is used to compare the real-time field strength data to obtain the maximum magnetic field strength.

[0015] As an embodiment of the present invention, the magnetic proximity switch identifies the N-pole magnetic field and the S-pole magnetic field of the first magnetic steel and the second magnetic steel respectively, and is used to determine the upper limit or lower limit of the lifting rod during the rising or falling process.

[0016] As an embodiment of the present invention, the first magnetic steel and the second magnetic steel are both NdFeB magnets with super strong magnetic fields.

[0017] In addition, according to an embodiment of the present invention, the present invention also provides a control method for a lifting rod with a magnetic limit switch, comprising the following steps:

[0018] When the controller issues an ascending command, the control driving mechanism drives the top pipe, the first inner pipe and the second inner pipe to move away from the bottom pipe until the magnetic proximity switch detects that the real-time field strength data of the second magnetic steel is equal to the pre-recorded maximum magnetic field strength, the driving mechanism stops working, and the lifting rod reaches the upper limit position;

[0019] When the controller issues a descending command, the control driving mechanism drives the top tube, the first inner tube and the second inner tube to move toward the bottom tube until the magnetic proximity switch detects that the real-time field strength data of the first magnetic steel is equal to the pre-recorded maximum magnetic field strength, the driving mechanism stops working, and the lifting rod reaches the lower limit.

[0020] Compared with the prior art, the present invention has the following beneficial effects: the magnetic limit assembly is used to detect whether the lifting rod has reached the upper limit or the lower limit when it rises or falls, thereby controlling the driving mechanism to stop working; the magnetic limiter is used to replace the trigger limit mechanism of the traditional lifting rod, thereby solving the problems of the traditional lifting rod that after long-term use, the trigger position may move or fail due to deformation of the tube body, the assembly tolerance of the tube body, the gap therebetween, the accumulated tolerance, etc. may all lead to limit failure, and the failure or jamming of the spring may easily lead to discontinuous contact of the touch rod, thereby causing trigger failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a traditional lifting rod in the background technology of the present invention;

[0022] Figure 2 A schematic diagram of a lifting rod according to another embodiment of the present invention;

[0023] Figure 3 A schematic structural diagram of a lifting rod according to another embodiment of the present invention;

[0024] Figure 4 It is an enlarged schematic diagram of a transmission mechanism of a lifting rod according to another embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the movement of the first magnetic steel of the lifting rod according to another embodiment of the present invention;

[0026] Figure 6 A control flow chart of a motor according to another embodiment of the present invention;

[0027] Figure 7 FIG. 4 is a circuit diagram of a magnetic limit switch according to another embodiment of the present invention. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] like Figures 2 to 6 As shown, the embodiment of the present invention provides a lifting rod with a magnetic limit switch and a control method, including:

[0030] The bottom tube 2, the top tube 5, the first inner tube 3, the second inner tube 4, the driving mechanism, the controller and the magnetic stopper, the top tube 5, the second inner tube 4, the first inner tube 3 and the bottom tube 2 are sleeved from top to bottom, and the driving mechanism is arranged in the bottom tube 2, and is used to drive the top tube 5, the second inner tube 4 and the first inner tube 3 to move, so that the lifting rod is extended or shortened;

[0031] The controller is electrically connected to the magnetic limit switch and the driving mechanism respectively, and is used to detect whether the lifting rod reaches the upper limit or the lower limit through the magnetic limit switch, and control the driving mechanism to stop working;

[0032] The working principle of the above technical solution is as follows: in actual use, the controller drives the top pipe 5, the first inner pipe 3 and the second inner pipe 4 to move away from or close to the bottom pipe 2 to complete the lifting rod rising or falling; in the process of the lifting rod rising or falling, the magnetic limit assembly detects whether the lifting rod reaches the upper limit or the lower limit, thereby controlling the driving mechanism to stop working;

[0033] The beneficial effects of the above technical solution are as follows: the magnetic limit assembly is used to detect whether the lifting rod has reached the upper limit or the lower limit when it rises or falls, thereby controlling the driving mechanism to stop working; the magnetic limiter is used to replace the trigger limit mechanism of the traditional lifting rod, thereby solving the problems of the traditional lifting rod after long-term use, which may cause the trigger position to move or fail due to deformation of the tube body, and the assembly tolerance of the tube body, the gap therebetween, the accumulated tolerance, etc. may all lead to limit failure, and the failure or jamming of the spring may easily cause the touch rod to not make continuous contact, thereby leading to trigger failure; at the same time, the magnetic limiter has the advantages of simple structure, high reliability, high processability, small size and low cost.

[0034] In one embodiment, the magnetic limiter includes: a magnetic proximity switch 6, a first magnetic steel 7 and a second magnetic steel 19, the magnetic proximity switch 6 is arranged on the outer wall of the bottom tube 2, the first magnetic steel 7 is arranged on the inner wall of the top tube 5, and the second magnetic steel 19 is arranged on the inner wall of the first inner tube 3, and the magnetic proximity switch 6 is respectively adapted to the first magnetic steel 7 and the second magnetic steel 19;

[0035] The magnetic proximity switch 6 comprises: a high-precision magnetic field detection and recording component, which is electrically connected to the controller and is used to detect the magnetic field strength in real time, obtain real-time field strength data and record it;

[0036] A comparator is electrically connected to the high-precision magnetic field detection and recording component and is used to compare the real-time field strength data to obtain the maximum magnetic field strength;

[0037] The working principle and beneficial effects of the above technical solution are as follows: when the first magnet 7 or the second magnet 19 approaches the magnetic proximity switch 6 and reaches the recorded or preset maximum magnetic field strength, the magnetic proximity switch 6 is actuated and transmits a signal to the lifting rod controller, and the controller issues an instruction to control the electric drive mechanism to stop or start working; wherein, the magnetic limiter is a high-precision magnetic limiter, which includes a high-precision magnetic field detection and recording component and a comparator, which can detect and record the magnetic field strength in real time, and make comparisons, and after finding the maximum magnetic field strength point according to the comparison results, send a signal to the lifting rod controller for corresponding control.

[0038] In one embodiment, the magnetic proximity switch 6 identifies the N-pole magnetic field and the S-pole magnetic field of the first magnetic steel 7 and the second magnetic steel 19, respectively, to determine the upper limit or lower limit of the lifting rod during the lifting or lowering process;

[0039] The working principle and beneficial effects of the above technical solution are as follows: the magnetic proximity switch 6 can respectively identify the N-pole magnetic field or the S-pole magnetic field of the first magnetic steel 7 or the second magnetic steel 19, and send out different signals, that is, the effect of detecting the upper limit and the lower limit of the lifting rod is achieved by using a magnetic proximity switch 6 with the first magnetic steel 7 and the second magnetic steel 19.

[0040] In one embodiment, the first magnetic steel 7 and the second magnetic steel 19 are both NdFeB magnets with super strong magnetic field.

[0041] The working principle and beneficial effects of the above technical solution: the first magnetic steel 7 and the second magnetic steel 19 are magnets with super strong magnetic fields, which can penetrate materials other than magnetic materials such as steel with a thickness of more than 200 mm, have a long effective distance, and save a lot of intermediate transmission links; compared with the traditional lifting rod trigger limit mechanism, it has the advantages of simple structure, high reliability, strong processability, small size and low cost.

[0042] In one embodiment, the driving mechanism includes: a transmission mechanism, a driving plate and a motor, the driving plate is electrically connected to the controller, the driving plate is electrically connected to the motor, and the transmission mechanism includes:

[0043] The first transmission mechanism includes: a first rack 8, a second rack 9 and a driving gear 11; the first rack 8 is arranged on the inner wall of the bottom tube 2 in the up-down direction, the second rack 9 is arranged opposite to the first rack 8, the second rack 9 is arranged at the bottom end of the second inner tube 4, and the second rack 9 extends into the first inner tube 3; the driving gear 11 is rotatably arranged on the first inner tube 3, the driving gear 11 is located between the first rack 8 and the second rack 9, and is meshed with the first rack 8 and the second rack 9 respectively;

[0044] The driving gear 11 is transmission-connected to the motor;

[0045] The working principle and beneficial effects of the above technical solution are as follows: Figure 3-Figure 4As shown, in order to make the first inner tube 3 and the second inner tube 4 rise and fall synchronously, a first rack 8 and a second rack 9 are respectively arranged on the bottom tube 2 and the second inner tube 4, and the above two racks are arranged in the up-down direction and meshed with a driving gear 11; the driving gear 11 is rotatably arranged on the first inner tube 33; in this way, when the motor (not shown in the figure) drives the driving gear 11 to rotate, the driving gear 11 can drive the first inner tube 3 to climb up and down due to the installation position of the first rack 8; and because the first rack 8 and the second rack 9 are arranged oppositely, the second inner tube 44 can be driven to climb up and down through the second rack 9 under the rotation of the driving gear 11, so as to achieve the purpose of one driving gear 11 driving the two inner tubes to move synchronously; of course, in order to improve the stability of the two inner tubes during the movement, two sets of first drive structures arranged in a mirror image can be provided, one of the driving gears 11 of the two sets of first transmission structures is a driving gear, and the other is a driven gear, and the two sets of first transmission structures move synchronously to balance the forces on the two inner tubes.

[0046] In one embodiment, a groove is formed on the inner wall of the bottom tube 2 in the vertical direction, and the first rack 8 is clamped in the groove.

[0047] The working principle and beneficial effects of the above technical solution: In order to fix the first rack 8 to the inner wall of the bottom tube 2, this embodiment provides a groove arranged along the up-down direction on the inner wall of the bottom tube 2, so that the first rack 8 can be inserted into the groove and the teeth of the first rack 8 are exposed, so that the driving gear 11 can drive the first inner tube 3 to rise and fall under the rotation of the driving gear 11.

[0048] In one embodiment, a stopper 10 perpendicular to the second rack 9 is provided at the upper end thereof, and a notch matching with the stopper 10 is provided at the bottom of the second inner tube 4, and the stopper 10 is embedded in the notch;

[0049] The working principle and beneficial effects of the above technical solution are as follows: Figure 3-Figure 4 As shown, in order to fix the second rack 9 to the second inner tube 4, the present embodiment sets a stopper 10 at the upper end of the second rack 9, and the stopper 10 is set perpendicular to the second rack 9 (that is, the stopper 10 is set in the left and right direction). The stopper 10 can extend into the groove opened at the bottom of the second inner tube 4, so that the second rack 9 and the second inner tube 4 form a whole, and the second rack 9 is limited at the second inner tube 44, so as to link the second inner tube 4 to rise and fall with the cooperation of the driving gear 11.

[0050] In one embodiment, a mounting block 12 is provided at the bottom of the first inner tube 3, the driving gear 11 is rotatably disposed on the mounting block 12, and the mounting block 12 is slidably connected to the inner wall of the bottom tube 2;

[0051] The working principle and beneficial effects of the above technical solution are as follows: Figure 3-Figure 4As shown, in order to provide a larger installation space for the driving gear 11, the present embodiment sets a mounting block 12 at the bottom of the first inner tube 3, one end of the mounting block 12 protrudes from the outside of the first inner tube 3, and the other end thereof extends into the first inner tube 3, so as to facilitate the rotatable installation of the driving gear 11 on the mounting block 12; and the mounting block 12 can slide up and down as the first inner tube 3 is lifted and lowered; at the same time, the end of the mounting block 12 protruding from the first inner tube 3 can slide into the inner wall of the bottom tube 2, so as to guide the first inner tube 3 by sliding the mounting block 12, so as to prevent the first inner tube 3 from radially rotating or deflecting; preferably, a slide groove is provided on the inner wall of the bottom tube 22 along the up and down direction, and the slide groove is located on one side of the first rack 8 and slidably cooperates with the mounting block 12.

[0052] In one embodiment, the transmission mechanism further includes: a second transmission structure, the second transmission mechanism includes: a first transmission gear 13, a driven gear 14 and a screw 15, a second transmission gear and a third transmission gear; the transmission gear 13 is coaxially arranged with the driving gear 11, the second transmission gear and the third transmission gear are coaxially arranged, and are rotatably connected with the first inner tube 3, and the transmission shaft passes between two adjacent second racks 9; the second transmission gear is meshed with the first transmission gear, the driven gear 14 is meshed with the third transmission gear, and the driven gear 14 and the third transmission gear are both helical gears; the screw 15 is penetrated in the driven gear 14 in the up-down direction, the screw 15 is threadedly sleeved with a slide 16, and the slide 16 is arranged on the top tube 55;

[0053] The working principle and beneficial effects of the above technical solution are as follows: Figure 3-Figure 4 As shown, in order to link the top pipe 55 to rise and fall through the first transmission structure, the second transmission structure is provided in this embodiment. The second driving structure realizes transmission through the first transmission gear 13, the second transmission gear and the third transmission gear and the driven gear 14, so that the rotation of the driving gear 11 drives the driven gear 14 to rotate, so that the driven gear 14 drives the screw rod 15 to rotate, and the rotation of the screw rod 15 can make the slide seat 16 thereon slide in the up and down direction, and then drive the top pipe 55 to rise and fall through sliding; further, the rotation directions of the first transmission gear 13 and the driven gear 14 are respectively defined as The first direction and the second direction, the first direction is perpendicular to the second direction; preferably, the rotation direction of the driving gear 11 is the first direction; in this embodiment, the axial directions of the driving gear 11 and the first transmission gear 13 are arranged along the front-to-back direction, and the axial direction of the driven gear 14 is arranged along the up-down direction, and the above gears are meshed to enable the driving gear 11 to drive the driven gear 14 to rotate; of course, the driving gear 11 and the driven gear 14 are connected by a plurality of meshing transmission gears, and the number of transmission gears is selected according to the installation positions of the driving gear 11 and the driven gear 14; and, Figure 4As shown, the screw rod 15 is arranged on one side of the axis of the tube body. In order to balance the force on the tube body and prevent it from shifting during the lifting process, the second transmission structure can be set to two groups, and they can be mirrored relative to the axis of the tube body. The above installation requirements can be reasonably arranged according to the inner diameter of the tube body and will not be described in detail here.

[0054] In addition, the present invention also provides a control method for a lifting rod with a magnetic limit switch, comprising the following steps:

[0055] When the controller issues an ascending command, the control driving mechanism drives the top pipe, the first inner pipe and the second inner pipe to move away from the bottom pipe until the magnetic proximity switch detects that the real-time field strength data of the second magnetic steel is equal to the pre-recorded maximum magnetic field strength, the driving mechanism stops working, and the lifting rod reaches the upper limit position;

[0056] When the controller issues a descending command, the control driving mechanism drives the top pipe, the first inner pipe and the second inner pipe to move toward the bottom pipe until the magnetic proximity switch detects that the real-time field strength data of the first magnetic steel is equal to the pre-recorded maximum magnetic field strength, the driving mechanism stops working, and the lifting rod reaches the lower limit position;

[0057] The working principle of the above technical solution is as follows: the controller sends an ascending command, the driving component drives the lifting rod to ascend, when the second magnetic steel on the first inner tube approaches its magnetic proximity switch, the magnetic proximity switch starts to detect and record the magnetic field strength, and compares the currently recorded magnetic field strength with the magnetic field recorded at the previous time node, and finds the maximum magnetic field strength point according to the comparison result, that is, immediately sends a signal to the lifting rod controller after detecting the inflection point of the magnetic field strength change, and the controller sends an instruction to control the electric drive mechanism to stop working, and the lifting rod stops ascending and reaches the upper limit position;

[0058] The controller sends a descent command, and the electric drive assembly drives the lifting rod to descend. When the first magnet on the top pipe approaches the magnetic proximity switch, the magnetic proximity switch starts to detect and record the magnetic field strength, and compares the currently recorded magnetic field strength with the magnetic field recorded at the previous time node. The maximum magnetic field strength point is found according to the comparison result, that is, after detecting the inflection point of the magnetic field strength change, a signal is immediately sent to the lifting rod controller. The controller sends a command to control the electric drive mechanism to stop working, and the lifting rod stops descending and reaches the lower limit.

[0059] The beneficial effects of the above technical solution: Through the above technical solution, the trigger limit mechanism in the traditional lifting rod is replaced by a magnetic limiter, which solves the problems of the traditional lifting rod after long-term use, such as the deformation of the tube body, which may easily cause the trigger position to move or fail, the assembly tolerance of the tube body, the gap between it, the cumulative tolerance, etc., which may cause the limit failure, and the failure or jamming of the spring may easily cause the touch rod to not make continuous contact, thereby causing trigger failure.

[0060] like Figure 7 As shown, in one embodiment, a second resistor R2 is connected in series between the output end of the magnetic limiter and the port 1 of the optocoupler relay V1, a second resistor R3 is connected in series between the output end of the magnetic limiter and the port 2 of the optocoupler relay V1, the port 1 of the optocoupler relay V1 is connected to the first power supply VCC, and a first resistor R1 is provided between the port 1 of the optocoupler relay V1 and the first power supply VCC; the port 2 of the optocoupler relay V1 is connected to one end of a fourth resistor R4, and the other end of the fourth resistor is grounded;

[0061] Port 3 of the optocoupler relay V1 is grounded, port 4 of the optocoupler relay V1 is connected to one of the input ports of the controller, port 4 of the optocoupler relay V1 is connected to the second power supply VDD, and a fifth resistor R5 is provided between port 4 of the optocoupler relay V1 and the second power supply VDD;

[0062] One end of the magnetic limit switch is connected to the third power supply V, and the other end of the magnetic limit switch is grounded;

[0063] The working principle of the above technical solution is as follows: the magnetic limit switch inputs a signal to the optocoupler relay V1, which is then transmitted to the controller via the optocoupler relay to complete the signal transmission from the magnetic limit switch to the controller; wherein, the use of the optocoupler relay V1 can improve the quality of signal transmission.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A lifting rod with a magnetic limit switch, characterized in that: include: The bottom tube, the top tube, the first inner tube, the second inner tube, the driving mechanism, the controller and the magnetic stopper are provided. The top tube, the second inner tube, the first inner tube and the bottom tube are sleeved from top to bottom. The driving mechanism is provided under the bottom tube and is used to drive the top tube, the second inner tube and the first inner tube to move so as to extend or shorten the lifting rod. The controller is electrically connected to the magnetic limit switch and the driving mechanism respectively, and is used to detect whether the lifting rod reaches the upper limit or the lower limit through the magnetic limit switch, and control the driving mechanism to stop working.

2. A lifting rod with a magnetic limit switch as claimed in claim 1, characterized in that: The magnetic limiter comprises: a magnetic proximity switch, a first magnetic steel and a second magnetic steel, the magnetic proximity switch is arranged on the outer wall of the bottom tube, the first magnetic steel is arranged on the top tube, the second magnetic steel is arranged on the first inner tube, and the magnetic proximity switch is respectively matched with the first magnetic steel and the second magnetic steel; The magnetic proximity switch includes: a high-precision magnetic field detection and recording component, which is electrically connected to the controller and is used to detect the magnetic field strength in real time, obtain real-time field strength data and record it; The comparator is electrically connected to the high-precision magnetic field detection and recording component and is used to compare the real-time field strength data to obtain the maximum magnetic field strength.

3. A lifting rod with a magnetic limit switch as claimed in claim 1, characterized in that: The magnetic proximity switch identifies the N-pole magnetic field and the S-pole magnetic field of the first magnetic steel and the second magnetic steel respectively, and is used to determine the upper limit position or the lower limit position during the lifting rod rising or falling process.

4. A lifting rod with a magnetic limit switch as claimed in claim 1, characterized in that: The first magnetic steel and the second magnetic steel are both NdFeB magnets with super strong magnetic field.

5. A control method for a lifting rod with a magnetic limit switch, characterized in that: The following steps are involved: When the controller issues an ascending command, the control driving mechanism drives the top pipe, the first inner pipe and the second inner pipe to move away from the bottom pipe until the magnetic proximity switch detects that the real-time field strength data of the second magnetic steel is equal to the pre-recorded maximum magnetic field strength, the driving mechanism stops working, and the lifting rod reaches the upper limit position; When the controller issues a descending command, the control driving mechanism drives the top tube, the first inner tube and the second inner tube to move toward the bottom tube until the magnetic proximity switch detects that the real-time field strength data of the first magnetic steel is equal to the pre-recorded maximum N magnetic field strength, the driving mechanism stops working, and the lifting rod reaches the lower limit.

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