A balustrade type pilot safety lock

Abstract

The utility model discloses a kind of rail type pilot safety lock, belong to engineering machinery technical field, the safety lock includes pedestal, nylon cover, safety guardrail, sponge sheath, nitrogen spring, lock plate, latch, support and travel switch, pedestal is installed in cab side by bolt, safety guardrail tail end is connected with pedestal by pin shaft, nitrogen spring head is installed on pedestal by pin shaft, nitrogen spring tail is installed on safety guardrail by pin shaft, lock plate is installed below safety guardrail head end by screw, support is installed in the other side of cab by screw, travel switch is placed below support, bolt is installed in the side of cab. Compared with prior art, the safety lock is simple in structure, easy to operate, the driver only needs to lift or put down the safety guardrail placed in front of seat, to close or open the whole vehicle pilot lock, effectively avoid the security risk caused by accidental touch during the process of driver getting on or off the vehicle or other unnecessary actions.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, and in particular relates to a railing-type pilot safety lock. Background Technology

[0002] Currently, manned construction machinery (such as excavators and loaders) commonly uses rotary pilot locks to control the start and stop of their hydraulic systems. This type of lock presents significant safety hazards: its unlocking / locking relies on a short-stroke (typically 90°~180°) rotation by the operator's hand, lacking clear operational feedback damping. When driving on bumpy roads, the operator's arm is prone to unintentional contact due to machine sway, leading to accidental unlocking of the hydraulic system. More seriously, the rotary lock cylinder only functions as an electrical switch and cannot create a physical barrier. The operator can freely get in and out of the machine even when it is not locked, making it highly susceptible to malfunctions due to forgetting to lock or misjudging the status, potentially causing accidents. Therefore, it is urgent to address the safety hazards caused by accidental or missed locking operations by the operator when construction machinery is in standby mode with the engine running.

[0003] To address the aforementioned problems, this utility model aims to provide an improved solution. There is an urgent need in the prior art for a pilot safety lock mechanism that possesses physical blocking capabilities, provides clear operational feedback, and effectively prevents unintentional touches and passage in an unlocked state, thereby enhancing operational safety and reliability. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a railing-type pilot safety lock, which solves the problems through the following technical means: A railing-type pilot safety lock, installed at the seat entrance / exit of the driver's cab, is characterized by comprising a base, a safety railing, a foam cover, a bracket, a limit switch, a nitrogen spring, a lock plate, a male and a female latching head, wherein: the base body has two connecting holes from top to bottom, and the bottom of the base is installed in the driver's cab near the seat armrest by screws; the safety railing is a rod-shaped structure, one end of which is installed in the connecting hole at the top of the base via a pivot; the foam cover is fitted onto the safety railing; the bracket has a semi-circular opening in the middle that matches the shape of the safety railing, and a 90° flange at the bottom of the bracket. The system is installed in the cab near the seat armrest using screws; the limit switch is installed at the bottom of the bracket; one end of the nitrogen spring is installed in the bottom connection hole of the base via a rotating shaft, and the other end of the nitrogen spring is connected to the end hole of the bracket slot via a rotating shaft; the inner end of the bracket slot is fixed to the lower side of the safety guardrail by multiple screws; the locking plate is an arc-shaped panel, installed at the bottom of the safety guardrail near the bracket, with the curved surface of the locking plate facing the limit switch, and the limit switch can be triggered when the locking plate approaches the limit switch; the male latch is installed near the locking plate, and the male latch has a convex head structure; the female latch is installed on the bracket and is used to engage the male latch.

[0005] Preferably, the limit switch is provided with a switch rocker arm, and a roller is mounted on the outer end of the switch rocker arm via a rotating shaft. The roller is used to contact the locking plate, and the swing of the switch rocker arm can generate a switch signal.

[0006] Preferably, it also includes a nylon sleeve, which is installed on the tail end pivot of the safety railing.

[0007] Preferably, the outer end of the convex head structure is larger than the bottom end, and the outer end and the bottom end are connected by an arc surface. Preferably, the center of the latch head is provided with a groove that is consistent with the shape of the protrusion. A limiting ball is provided on the inner wall of the groove. The limiting ball and its compression spring are installed in the ball through hole by mounting screws. The end of the ball through hole has an exposed hole with a diameter smaller than that of the limiting ball.

[0008] The railing-type pilot safety lock of this utility model has the following beneficial effects: This device significantly enhances operational safety through a dual protection mechanism of mechanical blocking and electrical interlocking. A safety barrier spans the front of the driver's seat, creating a wraparound physical isolation space. This forces the driver to actively lift the barrier when getting in and out of the vehicle, mitigating the risk of unintentional contact during bumpy conditions. When the barrier falls, the locking pins automatically engage to achieve mechanical locking. Simultaneously, the lock plate presses the limit switch rocker arm to activate the pilot control circuit, forming a rigid safety logic of "disable if not locked." This completely resolves the potential for misoperation caused by the short-stroke operation, lack of physical blocking, and absence of status feedback inherent in traditional rotary locks.

[0009] The nitrogen spring system provides continuous thrust to reduce operating effort when the guardrail is raised, and automatically forms a support lock after being raised to the highest position; the sponge sleeve in the middle section of the safety guardrail effectively buffers collision impact, and the nylon sleeve in the tail pin hole achieves self-lubrication and eliminates metal friction noise; the entire system only requires a single action to operate the guardrail to simultaneously complete the linkage between mechanical locking and electrical switching, realizing intuitive safety control of "lifting to cut off power and lowering to turn on power".

[0010] The main body adopts a curved tube guardrail with standardized components (pump lock, limit switch, etc.). The base and bracket are directly adapted to the existing cab installation by bolts. The self-lubricating nylon sleeve and sealed nitrogen spring ensure that the device is maintenance-free for life and has a long service life. The overall modification cost is lower than the traditional rotary lock upgrade solution. It can be widely used in construction machinery such as excavators and loaders, maximizing economic benefits while ensuring inherent safety. Attached Figure Description

[0011] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the locking plate structure of this utility model; Figure 3 This is a schematic diagram of the limit switch structure of this utility model; Figure 4 This is a schematic diagram of the installation of the nitrogen spring of this utility model; Figure 5 This is a schematic diagram of the latch structure of this utility model; Figure 6 This is a schematic diagram of the installation of the nylon sleeve of this utility model; Figure 7 This is a schematic diagram of the safety railing in the closed state of this utility model; Figure 8 This is a schematic diagram of the safety railing in the open state of this utility model.

[0013] Among them, 1-base, 2-safety railing, 3-sponge sleeve, 4-bracket, 5-limit switch, 501-switch rocker arm, 502-roller, 6-nitrogen spring, 601-bracket groove, 7-lock plate, 8-male latch bolt, 801-protruding head, 9-female latch bolt, 901-groove, 902-limit ball, 903-mounting screw, 10-nylon sleeve. Detailed Implementation

[0014] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0015] The present invention will now be described in detail with reference to the accompanying drawings.

[0016] like Figures 1 to 8 As shown, this railing-type pilot safety lock is installed at the seat entrance / exit of the driver's cab. It is characterized by comprising a base 1, a safety railing 2, a sponge sleeve 3, a bracket 4, a limit switch 5, a nitrogen spring 6, a lock plate 7, a male latch 8, and a female latch 9. In the figure, the base 1 has two connecting holes from top to bottom, and the bottom of the base 1 is screwed to a position near the seat armrest in the driver's cab. The safety railing 2 is a rod-shaped structure, with one end of the safety railing 2 mounted in the top connecting hole of the base 1 via a pivot. The sponge sleeve 3 is fitted onto the safety railing 2. The bracket 4 has a semi-circular opening in the middle that matches the shape of the safety railing 2, and a 90° flange at the bottom of the bracket 4, which is screwed... The nail is installed in the cab near the seat armrest; the limit switch 5 is installed at the bottom of the bracket 4; one end of the nitrogen spring 6 is installed in the bottom connection hole of the base 1 through a rotating shaft, and the other end of the nitrogen spring 6 is connected to the end hole of the bracket groove 601 through a rotating shaft. The inner end of the bracket groove 601 is fixed to the lower side of the safety guardrail 2 by multiple screws; the locking plate 7 is an arc-shaped panel, and the locking plate 7 is installed at the bottom of the end of the safety guardrail 2 near the bracket 4. The curved surface of the locking plate 7 faces the limit switch 5. When the locking plate 7 is close to the limit switch 5, it can trigger the limit switch 5; the male latch 8 is installed near the locking plate 7. The male latch 8 is a convex head structure 801; the female latch 9 is installed on the bracket 4 and is used to engage the male latch 8.

[0017] In actual operation, the base is a welded component and is bolted to one side of the cab. The nylon sleeve is installed in the pin hole at the tail of the safety guardrail, and the sponge sleeve is fitted in the middle of the safety guardrail. The tail of the safety guardrail is connected to the base via a pin. The head of the nitrogen spring is mounted on the base via a pin, and the tail of the nitrogen spring is mounted on the safety guardrail via a pin. The locking plate is mounted below the head of the safety guardrail with screws. The bracket is a welded component and is bolted to the other side of the cab. The bumper lock is a component consisting of male and female ends. The male end is bolted to the bottom of the head of the safety guardrail and arranged side by side with the locking plate. The female end is bolted to the inside of the bracket. The limit switch is located below the bracket and bolted to the side of the cab.

[0018] In the figure, the limit switch 5 is provided with a switch rocker arm 501. The outer end of the switch rocker arm 501 is equipped with a roller 502 through a rotating shaft. The roller 502 is used to contact the lock plate 7. The swing of the switch rocker arm 501 can generate a switch signal.

[0019] The figure also includes a nylon sleeve 10, which is installed on the tail end pivot of the safety guardrail 2. The nylon sleeve, placed in the pin hole at the tail end of the safety guardrail, serves a self-lubricating function and can effectively eliminate noise.

[0020] In actual operation, when the driver enters the cab and sits in the seat, the guardrail is lowered. The latch below the safety guardrail engages and locks the guardrail to prevent it from detaching. Simultaneously, the locking plate below the safety guardrail presses the limit switch rocker arm, causing it to rotate a certain angle. This energizes the limit switch, opening the vehicle pilot switch, allowing normal vehicle operation. When the driver wants to leave the driver's seat, the safety guardrail must be raised. At the moment the guardrail is raised, the locking plate below the head of the safety guardrail disengages from the limit switch rocker arm, the rocker arm resets, the limit switch is de-energized, the pilot lock closes, and all vehicle operations cease.

[0021] It should be further explained that the nitrogen spring plays an assist role in this device. When the driver lifts the safety barrier, the nitrogen spring provides thrust, allowing the barrier to be easily raised. When the safety barrier is raised to its highest position, the nitrogen spring provides support, preventing the barrier from falling. This device effectively prevents the risk of vehicle misoperation. Because the safety barrier is located in front of the seat, forming a wraparound space with the seat, the driver must first open the safety barrier when getting in and out of the vehicle; otherwise, they cannot get in or out. The driver must lower the safety barrier before operating the vehicle; otherwise, the pilot lock cannot be opened, and the entire device will not function.

[0022] In this embodiment, the outer end of the protruding head structure 801 is larger than the bottom end, and the outer end and the bottom end are connected by an arc surface. The middle part of the latch head 9 is provided with a groove 901 that is consistent with the shape of the protruding head structure 801. A limiting ball 902 is provided on the inner wall of the groove 901. The limiting ball 902 and its compression spring are installed in the ball through hole by the mounting screw 903. The end of the ball through hole has an exposed hole with a diameter smaller than the diameter of the limiting ball 902. Only part of one end of the limiting ball 902 can be exposed in the ball through hole. The other end of the limiting ball 902 is limited by the compression spring. The engaging movement of the protruding head structure 801 can apply an external force to the limiting ball 902, driving the limiting ball 902 to extend and retract along the ball through hole. When the latch is in contact, the limiting ball 902 can abut against the arc surface at the bottom end of the protruding head structure, so that resistance is generated when the latch is separated.

[0023] like Figure 7 and Figure 8As shown, during use, the driver enters the cab, flips down the safety railing, which can rotate around the base to lock into the bracket. The male and female locking contacts engage and lock, and the locking plate presses down on the rocker arm above the limit switch, causing it to rotate a certain angle. The limit switch is energized, the pilot switch opens, and the entire machine is then operated to perform its actions. When the driver needs to get out of the vehicle, they first lift the safety railing. The nitrogen spring assists in lifting it until it reaches its highest position, supporting the safety railing and preventing it from falling freely. At the same time as lifting the safety railing, the male and female locking contacts disengage, the locking plate releases the rocker arm on the limit switch, causing it to return to its original position. The limit switch is de-energized, the pilot switch closes, and the entire machine fails to operate.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A barrier-type pilot safety lock, installed at the seat entrance / exit of the driver's cab, characterized in that, Includes a base (1), safety railing (2), sponge sleeve (3), bracket (4), limit switch (5), nitrogen spring (6), lock plate (7), male latch (8), and female latch (9), wherein: The base (1) has two connecting holes from top to bottom, and the bottom of the base (1) is installed in the cab near the seat armrest by screws; The safety guardrail (2) is a rod-shaped structure, and one end of the safety guardrail (2) is installed in the top connection hole of the base (1) through a rotating shaft; The sponge cover (3) is fitted onto the safety railing (2); The bracket (4) has a semi-circular opening in the middle that is consistent with the shape of the safety guardrail (2), and the bottom of the bracket (4) has a 90° flange. The flange is installed in the cab near the seat armrest by screws. The limit switch (5) is installed at the bottom of the bracket (4); One end of the nitrogen spring (6) is installed in the bottom connection hole of the base (1) through a rotating shaft, and the other end of the nitrogen spring (6) is connected to the end hole of the bracket groove (601) through a rotating shaft. The inner end of the bracket groove (601) is fixed to the lower side of the safety railing (2) by multiple screws. The locking plate (7) is an arc-shaped panel. The locking plate (7) is installed at the bottom of one end of the safety railing (2) near the bracket (4). The curved surface of the locking plate (7) faces the limit switch (5). When the locking plate (7) is close to the limit switch (5), the limit switch (5) can be triggered. The male latch (8) is installed near the lock plate (7), and the male latch (8) has a convex head structure (801). The female latch (9) is mounted on the bracket (4) and is used to engage the male latch (8).

2. The railing-type pilot safety lock according to claim 1, characterized in that, The limit switch (5) is provided with a switch rocker arm (501). The outer end of the switch rocker arm (501) is equipped with a roller (502) through a rotating shaft. The roller (502) is used to contact the lock plate (7). The swing of the switch rocker arm (501) can generate a switch signal.

3. The railing-type pilot safety lock according to claim 1, characterized in that, It also includes a nylon sleeve (10), which is mounted on the tail end pivot of the safety guardrail (2).

4. The railing-type pilot safety lock according to claim 1, characterized in that, The convex head structure (801) has a larger outer end and a smaller bottom end, and the outer end and the bottom end are connected by an arc surface.

5. The railing-type pilot safety lock according to claim 1, characterized in that, The center of the latch head (9) is provided with a groove (901) that is consistent with the shape of the protruding head structure (801). A limiting ball (902) is provided on the inner wall of the groove (901). The limiting ball (902) and its compression spring are installed in the ball through hole by the mounting screw (903). The end of the ball through hole is provided with an exposed hole with a diameter smaller than that of the limiting ball (902).

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