Safety protection device of forklift door and forklift

Abstract

The utility model relates to a safety protection device of a forklift door and a forklift, the safety protection device of the forklift door comprises a detector and a controller, the detector is arranged in a forklift door lock, the forklift door lock has a locking state, the forklift door lock in the locking state locks the forklift door in a closed state, and the controller is connected with the detector. The detector detects whether the forklift door lock is in a locking state or not and feeds back the locking state to the controller through a signal, and the controller is used for sending an instruction of not allowing starting to the forklift according to the signal, provided by the detector, of the forklift door lock not in the locking state. The detector is arranged in the door lock of the forklift, whether the door of the forklift is closed or not can be reliably and accurately judged by detecting whether the door lock is in the locking state or not, meanwhile, the detector is arranged in the door lock of the forklift, the door lock can play a role in protecting the detector, and the detector is not prone to being impacted by the outside.

Description

Technical Field

[0001] The utility model relates to industrial handling vehicles, in particular to a safety protection device for a forklift door. Background Art

[0002] At present, the forklift cabs on the market generally do not have the function of detecting the opening and closing of the door, which poses certain safety risks. That is, during the driving process of the driver, the door is in a pseudo-closed state. Due to inertia or external force, the door rotates and exceeds the width of the forklift itself, thus triggering a safety accident. In response to this, some forklifts use sensors installed on the overhead guard to detect the distance between the door and the vehicle frame to achieve the detection of the opening and closing of the door. For example, a proximity switch is used as the sensor to detect whether the door is fully closed. If the door is not fully closed, the controller controls the forklift not to start. However, in actual use, it is found that such sensors are very likely to misdetect the driver, resulting in misjudgment of the results. Moreover, the sensors are directly installed on the vehicle frame and are easily damaged by external impacts. Summary of the Utility Model

[0003] Therefore, in view of the above problems, the utility model proposes a safety protection device for a forklift door with an optimized structure, and also proposes a forklift with the safety protection device for the forklift door.

[0004] The utility model is realized by the following technical solutions:

[0005] The utility model proposes a safety protection device for a forklift door, which includes a detector and a controller. The detector is arranged in the forklift door lock. The forklift door lock has a locked state. In the locked state, the forklift door lock locks the forklift door in the closed state. The detector detects whether the forklift door lock is in the locked state and feeds back a signal to the controller. The controller is used to send an instruction not to allow starting to the forklift according to the signal provided by the detector that the forklift door lock is not in the locked state.

[0006] Preferably, the forklift door lock includes a lock tongue rotatably arranged on the forklift door and a lock pin fixedly arranged on the overhead guard. In the locked state of the forklift door lock, the lock tongue has a locking position, and the detector detects whether the lock tongue is in the locking position.

[0007] Preferably, the lock pin is correspondingly arranged on the movement path of the lock tongue. A card slot is arranged on the lock tongue. When the lock tongue approaches the lock pin, the lock pin can push the lock tongue to rotate and then snap into the card slot, so that the lock tongue is displaced to the locking position and the forklift door lock enters the locked state.

[0008] Preferably, an inclined guiding surface is arranged on the lock tongue for guiding the lock pin to snap into the card slot.

[0009] Preferably, a boss extending towards the detector is arranged on the lock tongue.

[0010] Preferably, the detector is a microswitch, including a trigger spring plate arranged facing the locking tongue.

[0011] Preferably, in the locked state of the forklift door lock, the trigger spring plate and the lock pin jointly clamp and fix the locking tongue at the locked position.

[0012] Preferably, the forklift door lock includes a housing, and the detector is arranged inside the housing.

[0013] Preferably, the detector is a contact detector or a non-contact detector.

[0014] Based on the above, the present utility model further provides a forklift, including the safety protection device for the forklift door as described above.

[0015] The present utility model has the following beneficial effects: The detector is arranged in the door lock of the forklift, and it can reliably and accurately judge whether the forklift door is closed by detecting whether the door lock is in the locked state. At the same time, the detector is arranged in the door lock of the forklift, and the door lock can play a protective effect on the detector, and the detector is not easily affected by external impacts. Description of the Drawings

[0016] Figure 1 is a schematic diagram of the overhead guard and the forklift door of the forklift in the embodiment;

[0017] Figure 2 is Figure 1 a partial enlarged view of part A in

[0018] Figure 3 is a schematic diagram of the internal structure of the door lock after removing the housing in the embodiment;

[0019] Figure 4 is a three-dimensional schematic diagram of the locking tongue, the lock pin and the detector in the embodiment;

[0020] Figure 5 is a schematic diagram of the locking tongue in the unlocked position in the embodiment;

[0021] Figure 6 is a schematic diagram of the locking tongue in the locked position in the embodiment. Detailed Embodiments

[0022] To further illustrate the embodiments, the present utility model provides drawings. These drawings are part of the disclosure of the present utility model, mainly used to illustrate the embodiments, and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0023] The present utility model will be further described in conjunction with the accompanying drawings and specific embodiments.

[0024] Referring to Figures 1 - 2 As shown, as a preferred embodiment of the present utility model, a forklift is provided. The forklift includes a overhead guard 10 and a forklift door 20. The forklift door 20 is rotatably connected to the overhead guard 10 so that the forklift door 20 can rotate relative to the overhead guard 10 to open or close. A forklift door lock 30 is provided on the forklift door 20. The forklift door lock 30 has a locked state. In the locked state, the forklift door lock 30 locks the forklift door 20 in the closed state. The forklift door lock 30 includes a housing 40, and the housing 40 covers the internal structure of the forklift door lock 30 to provide a protective effect. Figure 3 The schematic diagram of the internal structure of the forklift door lock 30 after removing the housing 40 is shown. The forklift of this embodiment has a safety protection device for the door. The safety protection device for the door includes a detector 3 and a controller (not shown). The detector 3 is disposed in the forklift door lock 30. The detector 3 detects whether the forklift door lock 30 is in the locked state and feeds back a signal to the controller. The controller sends an instruction not to allow startup to the forklift according to the signal provided by the detector 3 that the forklift door lock 30 is not in the locked state.

[0025] The forklift door lock 30 enters the locked state only when the forklift door 20 is completely closed. Therefore, the safety protection device for the door in this embodiment can ensure that the forklift can start only when the forklift door 20 is completely closed. If the forklift door 20 is in the open or pseudo-closed state, the controller sends an instruction not to allow startup to the forklift, ensuring the driving safety of the forklift.

[0026] In this embodiment, the forklift door lock 30 includes a locking tongue 1 rotatably disposed on the forklift door 20 and a locking pin 2 fixedly disposed on the overhead guard 10. The locking tongue 1 and the locking pin 2 cooperate to lock the forklift door 20. In the locked state of the forklift door lock 30, the locking tongue 1 has a locking position. The detector 3 detects whether the locking tongue 1 is in the locking position. As Figures 3 - 6 shown, the locking tongue 1 is installed on the forklift door 20 and thus moves along with the movement of the forklift door 20. The locking pin 2 is correspondingly disposed on the movement path of the locking tongue 1. A slot 11 is provided on the locking tongue 1. When the locking tongue 1 approaches the locking pin 2, the locking pin 2 abuts against the locking tongue 1 and pushes the locking tongue 1 to rotate. Then, the locking pin 2 is inserted into the slot 11 so that the locking tongue 1 is displaced to the locking position and the forklift door lock 30 enters the locked state. In the case where the locking pin 2 is inserted into the slot 11, a rotation limiting member is further provided for the locking tongue 1, and the locking of the forklift door 20 can be achieved. The rotation limiting member can be implemented by using an existing lever swing mechanism. This kind of forklift door lock 30 using the locking tongue 1 and the locking pin 2 is existing.

[0027] Figure 5 andFigure 6 The states of the locking tongue 1 when the forklift truck door 20 is opened and closed are respectively shown. When the forklift truck door 20 is opened, the locking tongue 1 has an unlocking position. When the forklift truck door 20 is closed, the locking tongue 1 abuts against the locking pin 2, and the locking tongue 1 rotates to a locking position under the push of the locking pin 2.

[0028] The detector 3 of this embodiment is used to detect whether the locking tongue 1 is in the locking position and feedback a signal to the controller. The controller is used to send an instruction not to allow starting to the forklift truck according to the signal that the locking tongue 1 is not in the locking position provided by the detector 3, so as to avoid the safety hazard caused by the door not being closed after the forklift truck starts. In this embodiment, the detector 3 is a microswitch fixedly arranged in the forklift truck door lock 30. The detector 3 includes a touch elastic sheet 31 arranged facing the locking tongue 1. When the forklift truck door 20 is closed, the locking tongue 1 abuts against the locking pin 2, and the locking tongue 1 rotates to the locking position under the push of the locking pin 2, and further pushes the locking tongue 1 to press against the touch elastic sheet 31, so that the contact stroke of the detector 3 is closed and a signal is sent. The detector 3 is fixedly arranged on one side of the locking tongue 1, such as Figure 6 , when the forklift truck door 20 is closed, the touch elastic sheet 31 and the locking pin 2 jointly clamp and fix the locking tongue 1 in the locking position.

[0029] In this embodiment, the detector 3 is arranged in the forklift truck door lock 30, and it can reliably and accurately judge whether the forklift truck door 20 is closed by detecting whether the forklift truck door lock 30 is in the locked state, and it is not easily interfered by the outside. At the same time, the detector 3 is arranged in the forklift truck door lock 30, and the detector 3 is covered by the housing 40, and the forklift truck door lock 30 can play a protective effect on the detector 3, and the detector 3 is not easily impacted externally.

[0030] An inclined guiding surface 12 is provided on the locking tongue 1 for guiding the locking pin 2 to be inserted into the card slot 11. The provision of the inclined guiding surface 12 can make the relative contact between the locking pin 2 and the locking tongue 1 smoother.

[0031] A boss 13 extending towards the detector 3 is also provided on the locking tongue 1, and the boss 13 can improve the reliability and accuracy of the detection of the detector 3.

[0032] Using a microswitch as the detector 3 has high reliability and low cost. In other embodiments, a non-contact sensor can also be used to realize the detection of the locking tongue 1, and any sensor that can detect the position change of the locking tongue 1 can be used, such as a photoelectric sensor, an ultrasonic sensor or a capacitive sensor.

[0033] In addition to the door lock structure specifically implemented by the lock tongue 1 and the lock pin 2 in this embodiment, the safety protection device of the vehicle door in this embodiment can also be applied to other forms of door lock structures. For example, in a bolt-type door lock structure, the bolt-type door lock structure includes a bolt slidably disposed on the forklift door 20 and a bolt hole fixedly disposed on the overhead guard 10. The bolt is slidably inserted into the bolt hole to lock the forklift door 20. The detector 3 can be a microswitch disposed in the bolt hole, or can also be a non-contact sensor for detecting the sliding stroke of the bolt.

[0034] Although the present utility model has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes made to the present utility model in form and detail without departing from the spirit and scope of the present utility model defined by the appended claims all fall within the protection scope of the present utility model.

Claims

1. A safety protection device for a forklift door, characterized in that: The invention comprises a detector and a controller. The detector is arranged in a forklift door lock. The forklift door lock has a locked state. The forklift door lock in the locked state locks the forklift door in a closed state. The detector detects whether the forklift door lock is in the locked state and feeds back a signal to the controller. The controller is used for sending a command not to allow the forklift to start according to the signal provided by the detector that the forklift door lock is not in the locked state.

2. The safety protection device for a forklift door according to claim 1, characterized in that: The forklift door lock comprises a lock tongue rotatably arranged on the forklift door and a lock pin fixedly arranged on the overhead guard. The lock tongue has a locking position when the forklift door lock is in a locked state. The detector detects whether the lock tongue is in the locking position.

3. The safety protection device for a forklift door according to claim 2, characterized in that: The lock pin is correspondingly arranged on the movement path of the lock tongue, and a slot is provided on the lock tongue. When the lock tongue approaches the lock pin, the lock pin can push the lock tongue to rotate and then get stuck in the slot, so that the lock tongue moves to the locking position and the forklift door lock enters the locked state.

4. The safety protection device for a forklift door according to claim 3, characterized in that: An inclined guiding surface is provided on the locking tongue for guiding the locking pin to be clamped into the clamping slot.

5. The safety protection device for a forklift door according to claim 2, characterized in that: A boss extending toward the detector is arranged on the lock tongue.

6. The safety protection device for a forklift door according to claim 2 or 5, characterized in that: The detector is a micro switch, comprising a trigger spring arranged facing the lock tongue.

7. The safety protection device for a forklift door according to claim 6, characterized in that: When the forklift door lock is in the locked state, the trigger spring and the lock pin together clamp the lock tongue in the locked position.

8. The safety protection device for a forklift door according to claim 1, characterized in that: The forklift door lock comprises a cover shell, and the detector is arranged inside the cover shell.

9. The safety protection device for a forklift door according to claim 1, characterized in that: The detector is a contact detector or a non-contact detector.

10. A forklift, characterized in that: The invention comprises a safety protection device for a forklift door as claimed in any one of claims 1 to 9.

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