Retaining controllable hydraulic oil cylinder

Abstract

The invention discloses a retaining controllable hydraulic oil cylinder which is provided with an oil cylinder body, an oil pipe, a hydraulic valve and a push rod which is pushed outwards to provide sufficient pressure, an external thread is arranged on the surface of the push rod, a retaining nut lantern ring with an internal thread is installed on the push rod, and the retaining nut lantern ring is controlled to rotate so as to be in axial displacement with the push rod. When pressure output by the push rod is in place, an adjustable gap is preset for the retaining nut lantern ring facing the oil cylinder body, the retaining nut lantern ring and the push rod are integrally formed in a rotation stopping mode, and the push rod is retained and limited in the gap return-to-zero mode. According to the hydraulic oil cylinder, the retaining nut lantern ring is installed and connected on the threads of the push rod or the oil cylinder body, so that the push rod can obtain a firm and reliable retaining effect on the premise that the push rod meets the construction requirement for outputting thrust, and catastrophic accidents caused by failure of the hydraulic oil cylinder are completely eradicated; and in addition, the lower retaining gap is flexible and adjustable, and the operation has diversified choices.

Description

Technical Field

[0001] The invention relates to a hydraulic thrust support mechanism, in particular to a hydraulic oil cylinder for preventing the collapse of support force due to a hydraulic system failure, and belongs to the field of mechanical technology. Background Art

[0002] Hydraulic cylinder is a relatively mature industrial control equipment. Under the action of high-pressure hydraulic oil, the hydraulic rod can be pushed out or retracted, and at the same time, a huge outward thrust output is generated. Usually, it is easy to control and can move forward and backward freely, and is widely used in various production and processing industries. However, in certain high-pressure occasions such as foundation pit excavation, once the hydraulic system fails, such as cylinder rupture, hydraulic oil pipe burst, hydraulic valve leakage or other failures, the cylinder push rod will lose pressure, and will begin to slide and gradually retreat under the action of external force, which will cause more serious accidents.

[0003] In some existing applications, hydraulic cylinders are required to have a safety stop mechanism. The hydraulic push rod can be pushed out in one direction, and in the event of an accident, under the action of the safety stop mechanism, the push rod cannot be retracted or can only be retracted a very small gap to prevent the accident loss from expanding.

[0004] The existing hydraulic cylinders of this type have a variety of safety stop mechanisms, but they still have many defects in actual applications. Figure 1 and Figure 2 A safety stop mechanism is shown, and its specific method is to machine several rows of one-way helical teeth 121a on the push rod 12 of the hydraulic cylinder, and the tooth spacing a is about 4mm, and the tooth bevel angle b is about 45°. At the same time, a circle of blocks 7 (two to six are OK, and the embodiment shown in the figure is four) are wrapped around the outer periphery of the push rod in the air, and the inner side of each block is also machined to form helical teeth with the same tooth pitch. These blocks can be controlled to hold the push rod tightly, and the push rod can only be pushed outwards but not retracted due to the interaction of the helical teeth, thereby realizing the one-way stop function. When the push rod needs to be retracted, the block needs to be released first so that the push rod is not held tightly, and then the push rod is driven forward by about 1mm, and then the push rod can be smoothly retracted. In terms of technical implementation, the safety stop mechanism has a gap that is approximately equal to the helical tooth spacing, is relatively fixed, and lacks adjustability; at the same time, when the push rod retracts, it needs to be pushed out 1-2mm to release the pressure on the helical tooth surface, which makes it impossible for the push rod to continue to be pushed out in many high-pressure situations.

[0005] like Figure 3A safety stop mechanism is specifically implemented by forming an annular protrusion 121 in the middle section of the push rod 12 of the hydraulic cylinder, so that a large gap is formed between the annular protrusion and the cylinder body 1; of course, the axial retraction stroke of the cylinder is also included. At the top position of this gap and the annular protrusion, a stack of single-piece steel sheets 8 with a thickness of 5mm is mounted through the suspension beam 9. The length of the steel sheet in the suspended state is close to the surface of the push rod, and the steel sheet corresponding to the annular protrusion leans on it, and is in a herringbone misaligned state with the steel sheet hanging in the gap, such as Figure 4 As shown. As the push rod outputs pressure outward and the gap becomes larger, when the extension stroke repeatedly exceeds 5mm, one of the inclined steel sheets 82 will turn into the gap and switch to a suspended state, so that when the push rod loses pressure and retreats due to external force, a stack of suspended steel sheets 81 in the gap is used to resist the annular protrusion of the push rod, preventing it from increasing the retreat range. However, in the technical implementation of this safety stop mechanism, the gap for the push rod to stop retreat is basically fixed, which is approximately equivalent to the thickness of one of the steel sheets. When the push rod retreats, it is also necessary to push it outward 1-2mm first, and the occasion constraints are the same as above; and it is also necessary to use an external device to lift most of the steel sheets away from the gap, which increases the difficulty of operation and poor operational reliability. In special occasions and environments, deformation or rust of the steel sheets can easily cause jamming, integral adhesion, etc., which affects the effect of the push rod to stop retreat. Summary of the invention

[0006] The purpose of the present invention is to provide a hydraulic oil cylinder with controllable stop and retreat, so as to solve the problems of safety guarantee and optimized control of the hydraulic oil cylinder stop and retreat in high-pressure and high-risk occasions.

[0007] A technical solution for achieving the above-mentioned purpose of the present invention is a hydraulic cylinder with controllable back-movement, which is provided with a cylinder body, an oil pipe, a hydraulic valve and a push rod for providing sufficient pressure to push outward, an external thread is arranged on the surface of the push rod, and a back-movement nut ring with an internal thread is installed on the push rod, the back-movement nut ring is controlled to rotate and is arranged with an axial displacement of the push rod, so that when the output pressure of the push rod is in place, a preset adjustable gap is set on the back-movement nut ring facing the cylinder body, and the back-movement nut ring is prevented from rotating and is formed as a whole with the push rod, and the back-movement limit of the push rod is located at the gap zero.

[0008] Furthermore, the outer periphery of the stop nut collar is provided with external convex teeth, and the external convex teeth are engaged with an external power tool to rotate.

[0009] Furthermore, the external power tool is a drive motor that is integrated and mounted on the outer wall of the cylinder body, and the output gear of the drive motor is meshed with the external convex teeth within an adjustable range of the gap.

[0010] Furthermore, the external power tool is a handheld or robot-gripped sprocket machine, and the sprocket machine is sleeved on the external convex teeth through a chain and transmits power within an adjustable range of the gap.

[0011] Furthermore, the outer wall of the oil cylinder body is provided with a non-contact sensor facing the stop nut collar for distance measurement and signal feedback.

[0012] Furthermore, the backstop nut collar is an integrally formed body of a wide diameter section and a narrow diameter section, and the surface of the wide diameter section is provided with external protruding teeth for driving the backstop nut collar to rotate, and the axial width of the narrow diameter section is greater than twice the axial width of the wide diameter section.

[0013] Another technical solution for achieving the above-mentioned purpose of the present invention is a hydraulic cylinder with controllable backstop, which is provided with a cylinder, a oil pipe, a hydraulic valve and a push rod for providing sufficient pressure to be pushed outward, the push rod is provided with a radially enlarged backstop protrusion at a position that meets the axial backstroke, the surface of the cylinder body is provided with an external thread, and a backstop nut ring with an internal thread is installed on the cylinder body, the backstop nut ring is controlled to rotate and is axially displaced with the cylinder body, so that when the push rod outputs the pressure in place, the backstop nut ring faces the backstop protrusion with a preset adjustable gap, and the backstop nut ring is prevented from rotating and is formed as one piece with the cylinder body, and the backstop limit of the push rod is located at the gap zero.

[0014] Furthermore, the axial width of the stop nut collar satisfies the requirement of being larger than the axial retraction stroke of the push rod and reaching a required preset gap.

[0015] Furthermore, a pressure sensor is provided on the end surface of the stop nut collar facing the stop protrusion, which contacts the stop protrusion, bears pressure and feeds back signals.

[0016] The hydraulic oil cylinder with controllable stop has outstanding substantial characteristics and its application is significantly progressive. The technical effects include: by installing a stop nut collar through thread processing on the push rod or the cylinder body, the push rod can obtain a solid and reliable stop effect under the premise of meeting the output thrust required by the construction, thereby preventing catastrophic accidents caused by failure of the hydraulic oil cylinder; and the stop gap under the design is flexibly adjustable, the operation has diversified options, and the necessity of pre-pushing the push rod a small distance before retreating is eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a structural schematic diagram of a safety backstop mechanism of an existing hydraulic oil cylinder.

[0018] Figure 2 yes Figure 1 Detailed structure diagram from another perspective.

[0019] Figure 3 It is a planar structural diagram of another safety stop mechanism of an existing hydraulic cylinder.

[0020] Figure 4 yes Figure 3 Schematic diagram of the three-dimensional structure from another perspective.

[0021] Figure 5 It is a structural schematic diagram of a preferred embodiment state 1 of a hydraulic cylinder with controllable stop and retreat according to the present invention.

[0022] Figure 6 It is a structural schematic diagram of state 2 of a preferred embodiment of a hydraulic cylinder with controllable stop and retreat according to the present invention.

[0023] Figure 7 It is a structural schematic diagram of a preferred embodiment state 1 of a hydraulic cylinder with controllable stop and retreat of the present invention.

[0024] Figure 8 It is a structural schematic diagram of state 2 of a preferred embodiment of a hydraulic cylinder with controllable stop and retreat according to the present invention. DETAILED DESCRIPTION

[0025] The specific implementation modes of the present invention will be further described below in conjunction with the accompanying drawings of the embodiments, so that the technical solution of the present invention is easier to understand and grasp, thereby making a clearer definition of the protection scope of the present invention.

[0026] In response to the functional requirement of the hydraulic cylinder to safely stop retreating under huge pressure, the present invention analyzes the movement structure principle of the hydraulic cylinder and innovatively proposes a hydraulic cylinder with controllable stop retreat. The hydraulic cylinder can effectively prevent landslides during foundation pit excavation and provide on-site construction personnel with convenient operation for adjusting the stop clearance of the push rod.

[0027] Common hydraulic cylinders on the market generally have a cylinder body, an oil pipe, a hydraulic valve, and a push rod that provides sufficient pressure to push outward. The present invention improves the technical improvement of the adjustable stop, such as Figure 5 and Figure 6 As shown in the figure, the push rod 12 surface is provided with external threads through industrial turning, and a stop nut collar 2 with internal threads is installed on the push rod 12. The stop nut collar 2 is controlled to rotate and can be set relative to the axial displacement of the push rod, so that the stop nut collar 2 faces the cylinder body 11 with a preset adjustable gap when the push rod outputs the pressure in place. i The stop nut collar is integrally formed with the push rod, and the push rod stop limit is located in the gap i Return to zero.

[0028] As can be seen from the above overview, the stop nut collar does not directly contact the push object (foundation pit facade) at the end of the push rod. Therefore, the external force on the stop nut collar is limited to the rotational driving force acting on it at the construction site. Based on the screw principle, the stop nut collar can be driven to rotate on the basis of the relative stillness of the push rod, and the axial displacement along the push rod is adjustable. This also makes the gap between the stop nut collar and the cylinder body iFreely adjustable. It is understandable that the drive torque required for the clearance adjustment operation is extremely small, so the operation is convenient and there are many options. On the contrary, since there is no external force driving the ring to rotate, it is formed as one with the push rod (that is, there is no driving force for axial displacement). If there is an abnormal situation such as oil leakage in the cylinder or rupture of the oil pipe, the cylinder pressure will decrease, and the push rod will tend to retreat as it is subjected to external force until the clearance is i After returning to zero, the stop nut collar will play a leading supporting role, and the axial retraction force of the push rod is divided by the relatively dense threads to avoid rotation and axial displacement (the torque required to drive the rotation is extremely large), thereby effectively preventing the push rod from further retreating.

[0029] From the further detailed features shown in the figure of the preferred embodiment, the back-moving nut collar 2 is an integrally formed body of a wide diameter section 21 and a narrow diameter section 22, and the surface of the wide diameter section 21 is provided with an external convex tooth 211 for driving the back-moving nut collar to rotate, and the axial width of the narrow diameter section is greater than twice the axial width of the wide diameter section. This can improve the structural strength and axial compressive resistance of the thrust nut collar. At the same time, based on the external convex tooth 211 provided above, the back-moving nut collar can be rotated and axially displaced by engaging the transmission of an external power tool. Here, the external power tool is preferably a drive motor 3 that is integrated and mounted on the outer wall of the cylinder body 11, and the output gear 31 of the drive motor 3 has a gap with the external convex tooth 211. i In this way, the size of the gap can be easily adjusted by controlling the output signal of the drive motor.

[0030] In addition, the outer wall of the oil cylinder body 12 may be optionally provided with a non-contact sensor 4 facing the stop nut collar 2 for distance measurement and signal feedback. Thus, the construction personnel can accurately grasp the gap in real time. i to achieve consistency in batch construction operations.

[0031] In addition to the above preferred implementations, the external power tool may also be a handheld or robot-gripped sprocket machine (not shown), and the sprocket machine is connected to the external convex teeth through a chain and transmits power within an adjustable range of the gap.

[0032] However, the technical improvements of the hydraulic cylinder of the present invention are not limited to the above embodiments. Figure 7 and Figure 8The structural diagram of a preferred embodiment of the present invention is shown. The push rod 12 is provided with a radially enlarged stop protrusion 121 at the position where the maximum axial retraction stroke c is met. The surface of the cylinder body 11 is provided with an external thread 111, and a stop nut collar 5 with an internal thread is installed on the cylinder body. The stop nut collar can be controlled to rotate and be axially displaced with the cylinder body, so that when the push rod outputs pressure in place, the stop nut collar faces the stop protrusion with a preset adjustable gap, and the stop nut collar is anti-rotating and formed as a whole with the cylinder body. The push rod stop limit is located at the gap zero.

[0033] As can be seen from the above overview, the principle of the preferred embodiment is similar to that of the preferred embodiment, the difference being the fine adjustment of the attachment position of the collar and the joint facing the push rod. It should be noted that the axial width of the collar of the stop nut in this embodiment satisfies the requirement of being larger than the axial retraction stroke cd allowed for the push rod and achieving the required preset clearance.

[0034] In addition, the end surface of the stop nut collar 2 facing the stop protrusion is provided with a pressure sensor 6 which contacts the stop protrusion, bears pressure and feeds back signals, so as to notify the on-site control personnel of the accident warning.

[0035] From the above introduction to the technical solution of the hydraulic oil cylinder with controllable stop and the detailed description of the embodiment of the present invention, it can be seen that the solution has outstanding substantial characteristics and significant progress. When it is applied to large pressures such as foundation pit excavation, by threading the push rod or the oil cylinder body to attach the stop nut collar, the push rod can obtain a solid and reliable stop effect under the premise of meeting the output thrust required by the construction, thereby preventing catastrophic accidents caused by failure of the hydraulic oil cylinder; and the stop gap of the design is flexibly adjustable, the operation has diversified options, and it also saves the necessity of pre-pushing the push rod a short distance before retreating. .

[0036] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the scope of protection required by the present invention.

Claims

1. A hydraulic cylinder with controllable stop, comprising a cylinder body, an oil pipe, a hydraulic valve and a push rod for providing sufficient pressure to push outward, characterized in that: The push rod surface is provided with an external thread, and a back-moving nut collar with an internal thread is installed on the push rod. The back-moving nut collar is controlled to rotate and is arranged with an axial displacement with the push rod, so that when the push rod output pressure is in place, the back-moving nut collar faces a preset adjustable gap with the cylinder body, and the back-moving nut collar is prevented from rotating and is formed as a whole with the push rod, and the back-moving limit of the push rod is located at the gap zero.

2. The hydraulic cylinder with controllable stop and retreat according to claim 1, characterized in that: The outer periphery of the stop nut collar is provided with external convex teeth, and the external convex teeth are engaged with the external power tool to rotate.

3. The hydraulic cylinder with controllable stop and retreat according to claim 2 is characterized in that: The external power tool is a driving motor which is integrally mounted on the outer wall of the oil cylinder body, and the output gear of the driving motor is meshed with the external convex teeth within the adjustable range of the gap.

4. The hydraulic cylinder with controllable stop and retreat according to claim 2 is characterized in that: The external power tool is a handheld or robot-held sprocket machine, and the sprocket machine is sleeved with external convex teeth through a chain and transmits power within an adjustable range of the gap.

5. The hydraulic cylinder with controllable stop and retreat according to claim 1, characterized in that: The outer wall of the oil cylinder body is provided with a non-contact sensor facing the stop nut collar for distance measurement and signal feedback.

6. The hydraulic cylinder with controllable stop and retreat according to claim 1, characterized in that: The backstop nut collar is an integrally formed body of a wide diameter section and a narrow diameter section, and the surface of the wide diameter section is provided with external protruding teeth for driving the backstop nut collar to rotate, and the axial width of the narrow diameter section is greater than twice the axial width of the wide diameter section.

7. A hydraulic oil cylinder with controllable stop, comprising an oil cylinder, an oil pipe, a hydraulic valve and a push rod for providing sufficient pressure to push outward, characterized in that: The push rod is provided with a radially enlarged stop protrusion at the position where the axial retraction stroke is met, the surface of the cylinder body is provided with an external thread, and a stop nut ring with an internal thread is installed on the cylinder body, the stop nut ring is controlled to rotate and is arranged with an axial displacement with the cylinder body, so that when the push rod outputs the pressure in place, the stop nut ring faces the stop protrusion with a preset adjustable gap, and the stop nut ring is prevented from rotating and is formed as a whole with the cylinder body, and the push rod stop limit is located at the gap zero.

8. The hydraulic cylinder with controllable stop and retreat according to claim 7, characterized in that: The axial width of the stop nut collar is greater than the axial retraction stroke of the push rod and reaches the required preset clearance.

9. The hydraulic cylinder with controllable stop and retreat according to claim 7, characterized in that: The end surface of the stop nut collar facing the stop protrusion is provided with a pressure sensor which contacts with the stop protrusion, bears pressure and feeds back signals.

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