A signal monitoring device for the steering angle of a forklift

Abstract

The utility model discloses a signal monitoring device for the steering angle of a forklift, belonging to the field of sensors and measurement technology. Aiming at the problem that the angle detection device in the prior art is vulnerable to external interference, the signal monitoring device for the steering angle of a forklift of the utility model uses the U-shaped permalloy structure of the magnetic isolation cover to shield the non-working side of the magnetic pole array, only exposing the bottom magnetic field, completely isolating interference and doubling the effective magnetic flux density; multiple pairs of NS alternating magnets are arranged in a ring and the pole pitch matches the width of the Hall sensor, realizing sensitive capture of micro-steering of ±1°. The linkage design of the insertion block and the slot is combined with the rotary support of the circular groove at the bottom of the turntable to eliminate wear and accurately transmit torque; the double O-ring IP67 seal and the base shock-absorbing layer cooperate to resist oil, moisture and impact. As a whole, it provides a highly reliable and maintenance-free signal source for forklift steering control.

Description

Technical Field

[0001] This utility model belongs to the field of sensor and measurement technology, specifically relating to a signal monitoring device for forklift steering angle. Background Technology

[0002] Currently, forklift steering angle detection mainly relies on three types of technologies: mechanical contact, photoelectric, and magnetic induction. Mechanical contact sensors (such as potentiometers) wear down due to physical friction, resulting in a lifespan of less than six months under high-frequency forklift steering conditions, and the signal continues to drift with wear. While photoelectric encoders avoid contact, their optical windows are easily obscured by oil and dust, and condensation in humid environments can cause them to fail, leading to signal interruption. Magnetic induction solutions, while theoretically resistant to contamination, are susceptible to electromagnetic interference from motors due to their open magnetic circuits, and commonly suffer from small-angle steering error detection—the magnet may not enter the effective sensing area during the initial free travel of the steering system, resulting in no signal output within ±5° of steering angle. These defects collectively cause steering feedback delays, control misjudgments, and system crashes, severely restricting applications in high-precision operating scenarios. The industry urgently needs a reliable monitoring solution that combines wear resistance, contamination resistance, interference resistance, waterproofing, and all-angle capture capabilities.

[0003] This invention attempts to solve or at least alleviate such problems by providing a steering angle detection device that enhances the magnetic induction effect. Utility Model Content

[0004] In view of one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a signal monitoring device for forklift steering angle, which has the advantage of strong resistance to external interference.

[0005] To achieve the above objectives, this utility model provides a signal monitoring device for forklift steering angle, comprising:

[0006] Testing institutions and components;

[0007] The detection mechanism includes an upper cover, a rotating shaft passing through the upper cover and the base, a first O-ring sleeved on the rotating shaft, a driven gear meshing with the rotating shaft gear ring, a magnetic pole array, a turntable at the bottom of the driven gear, a fixing block, a circuit board integrating a Hall sensor, a magnetic shield covering the magnetic pole array, a base, wires connecting the circuit board, a second O-ring at the bottom of the base, and a fixing ring.

[0008] The magnetic pole array is embedded in the placement slot of the turntable, and the magnetic shielding cover covers the non-working side of the magnetic pole array.

[0009] As a further improvement of this utility model, the driven gear has an insert block on its bottom surface and the turntable has an annular slot on its top surface, with the insert block and slot being sized to match.

[0010] As a further improvement of this utility model, the top of the fixing block is provided with a circular groove, and the bottom of the turntable is embedded in the circular groove.

[0011] As a further improvement of this utility model, the magnetic shield is a U-shaped permalloy shield.

[0012] As a further improvement of this utility model, the first O-ring seals the mating surface between the top cover and the base, and the second O-ring seals the wire outlet, thus forming an IP67 protection rating.

[0013] As a further improvement of this utility model, the magnetic pole array is composed of multiple pairs of alternating NdFeB magnets arranged in a circular region, with the center distance between adjacent magnets equal to the width of the Hall sensor.

[0014] As a further improvement of this utility model, the fixing ring is rigidly connected to the forklift steering axle, and the bottom surface of the base is covered with a shock-absorbing rubber layer.

[0015] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0016] This invention discloses a signal monitoring device for forklift steering angle. It utilizes a U-shaped permalloy shield to tightly shield the non-working side of the magnetic pole array, exposing only the magnetic field on the working side of the bottom surface. This completely isolates electromagnetic interference from the forklift motor and hydraulic system, while significantly increasing the effective magnetic flux density. The magnetic pole array employs multiple pairs of alternating NdFeB magnets arranged in a ring, with the adjacent center distance precisely matched to the width of the Hall sensor. This ensures that even a slight turn of ±1° triggers a significant signal change, eradicating the persistent problem of missed detections at small angles. The size matching and linkage between the insert and slot, combined with the rotational support of the circular groove embedded in the bottom of the turntable, eliminates mechanical wear and achieves lossless torque transmission. The IP67 sealing system formed by the first and second O-rings, along with the shock-absorbing rubber layer at the bottom of the base, provides extreme resistance to oil erosion, high humidity condensation, and high-frequency mechanical impact, doubling the lifespan. This overall design overcomes existing technological bottlenecks, providing a maintenance-free and reliable signal source for high-precision steering control and automated forklifts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a signal monitoring device for forklift steering angle according to the present invention;

[0018] Figure 2 This is a disassembly diagram of the detection structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the installation of the magnetic pole array of this utility model.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0021] Testing mechanism 1; Insert 2; Top cover 11; Rotating shaft 12; First O-ring 13;

[0022] Driven gear 14; Magnetic pole array 15; Turntable 16; Fixing block 17; Circuit board 18;

[0023] Magnetic shield 19; 110 Base; 111 Wire; Second O-ring 112; 113 Retaining ring;

[0024] Insert 141; Magnetic yoke 161; Slot 162; Placement slot 163; Circular slot 171. Detailed Implementation

[0025] 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.

[0026] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0027] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0028] A signal monitoring device for forklift steering angle, comprising:

[0029] Testing agency 1 and plug-in 2;

[0030] The detection mechanism 1 includes an upper cover 11, a rotating shaft 12 passing through the upper cover 11 and the base 110, a first O-ring 13 sleeved on the rotating shaft 12, a driven gear 14 meshing with the gear ring of the rotating shaft 12, a magnetic pole array 15, a turntable 16 at the bottom of the driven gear 14, a fixing block 17, a circuit board 18 integrating a Hall sensor, a magnetic shielding cover 19 covering the magnetic pole array 15, a base 110, a wire 111 connecting the circuit board 18, a second O-ring 112 at the bottom of the base 110, and a fixing ring 113.

[0031] The magnetic pole array 15 is embedded in the placement slot 163 of the turntable 16, and the magnetic shield 19 shields the non-working side of the magnetic pole array 15.

[0032] As a preferred embodiment of this utility model, the driven gear 14 is provided with a plug 141 on its bottom surface and the turntable 16 is provided with an annular slot 162 on its top surface, with the plug 141 and the slot 162 being sized to match.

[0033] As a preferred embodiment of the present invention, the top of the fixing block 17 is provided with a circular groove 171, and the bottom of the turntable 16 is embedded in the circular groove 171.

[0034] As a preferred embodiment of this utility model, the magnetic shield 19 is a U-shaped permalloy shield, which only exposes the working side of the bottom surface of the magnetic pole array 15.

[0035] As a preferred embodiment of this utility model, the first O-ring 13 seals the mating surface between the upper cover 11 and the base 110, and the second O-ring 112 seals the outlet of the wire 111, thus forming an IP67 protection rating.

[0036] As a preferred embodiment of this utility model, the magnetic pole array 15 is composed of multiple pairs of alternating NdFeB magnets arranged in a circular region, with the center distance between adjacent magnets equal to the width of the Hall sensor.

[0037] As a preferred embodiment of this utility model, the fixing ring 113 is rigidly connected to the forklift steering axle, and the bottom surface of the base 110 is covered with a shock-absorbing rubber layer.

[0038] Working principle: When the forklift turns, the steering force drives the rotating shaft 12 to rotate, and the gear ring on the side of the rotating shaft 12 drives the driven gear 14 meshing with it to rotate synchronously; the insert 141 at the bottom of the driven gear 14 is embedded in the annular slot 162 on the top surface of the turntable 16, and the size matching and linkage between the insert 141 and the slot 162 forces the turntable 16 to rotate with the driven gear 14; the magnetic pole array 15 is embedded in the placement groove 163 in the middle of the top surface of the turntable 16 and rotates synchronously with the turntable 16; the circular groove 171 on the top of the fixing block 17 matches the size of the bottom of the turntable 16 to form a stable rotation support; a magnetic shield 19 is set below the magnetic pole array 15, and its U-shaped slope fits The gold structure exposes only the working side of the bottom surface of the magnetic pole array 15, forcing the magnetic field to concentrate and penetrate downwards. The circuit board 18 is fixed on the base 110, and its integrated Hall sensor faces the bottom surface of the magnetic pole array 15. When the magnetic pole array 15 rotates, the position of the magnetic field lines changes continuously, and the Hall sensor generates a current signal under the action of the alternating magnetic field. The signal is transmitted to the plug-in 2 for output via the wire 111. The mating surface between the top cover 11 and the base 110 is sealed by the first O-ring 13, and the outlet of the wire 111 is sealed by the second O-ring 112, forming an IP67 protection system. The shock-absorbing rubber layer at the bottom of the base 110 and the fixing ring 113 work together to offset the vibration and impact of the forklift, ensuring stable signal acquisition.

[0039] In summary, this utility model provides a signal monitoring device for forklift steering angles. It utilizes a U-shaped permalloy shield to tightly shield the non-working side of the magnetic pole array, exposing only the magnetic field on the working side of the bottom surface. This completely isolates electromagnetic interference from the forklift motor and hydraulic system, while significantly increasing the effective magnetic flux density. The magnetic pole array employs multiple pairs of alternating NdFeB magnets arranged in a ring, with the adjacent center distance precisely matched to the width of the Hall sensor. This ensures that even a slight turn of ±1° triggers a significant signal change, eradicating the persistent problem of missed detections at small angles. The size matching and linkage between the insert and slot, combined with the rotational support of the circular groove embedded in the bottom of the turntable, eliminates mechanical wear and achieves lossless torque transmission. The IP67 sealing system formed by the first and second O-rings, along with the shock-absorbing rubber layer at the bottom of the base, provides extreme resistance to oil corrosion, high humidity condensation, and high-frequency mechanical impact, significantly extending its lifespan. Overall, this device overcomes existing technological bottlenecks, providing a maintenance-free and reliable signal source for high-precision steering control and automated forklifts.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A signal monitoring device for forklift steering angle, characterized in that, include: Testing agency (1) and plug-in (2); The detection mechanism (1) includes an upper cover (11), a rotating shaft (12) passing through the upper cover (11) and the base (110), a first O-ring (13) sleeved on the rotating shaft (12), a driven gear (14) meshing with the gear ring of the rotating shaft (12), a magnetic pole array (15), a turntable (16) at the bottom of the driven gear (14), a fixing block (17), a circuit board (18) integrating a Hall sensor, a magnetic shield (19) covering the magnetic pole array (15), a base (110), a wire (111) connecting the circuit board (18), a second O-ring (112) at the bottom of the base (110), and a fixing ring (113). The magnetic pole array (15) is embedded in the placement slot (163) of the turntable (16), and the magnetic shield (19) shields the non-working side of the magnetic pole array (15).

2. The signal monitoring device according to claim 1, characterized in that: The driven gear (14) has a plug (141) on its bottom surface and the turntable (16) has an annular slot (162) on its top surface. The plug (141) and the slot (162) are sized to match.

3. The signal monitoring device according to claim 2, characterized in that: The top of the fixed block (17) is provided with a circular groove (171), and the bottom of the turntable (16) is embedded in the circular groove (171).

4. The signal monitoring device according to claim 3, characterized in that: The magnetic shield (19) is a U-shaped permalloy shield.

5. The signal monitoring device according to claim 1, characterized in that: The first O-ring (13) seals the mating surface between the top cover (11) and the base (110), and the second O-ring (112) seals the outlet of the wire (111), thus forming an IP67 protection rating.

6. The signal monitoring device according to claim 1, characterized in that: The magnetic pole array (15) is a circular region composed of multiple pairs of alternating NdFeB magnets, with the center distance between adjacent magnets equal to the width of the Hall sensor.

7. The signal monitoring device according to claim 1, characterized in that: The fixed retaining ring (113) is rigidly connected to the forklift steering axle, and the bottom surface of the base (110) is covered with a shock-absorbing rubber layer.

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