Oil internal circulation type hydraulic safety coupling

Abstract

The invention discloses an oil internal circulation type hydraulic safety coupling which comprises a flange shaft, an expansion sleeve assembly, a flange shaft sleeve, a limiting end cover and an end cover connecting screw. The main piston can be pushed through the main piston screw to compress oil in the main piston cavity, so that the expansion cavity of the expansion sleeve is filled with high-pressure oil with specific pressure, the auxiliary piston is used for sealing, the main piston screw is retreated, and external high-pressure oil supply is not needed; on the other hand, relative slipping of the coupling flange shaft and the expansion sleeve assembly is detected through the pressure relief switch assembly, when slipping occurs, the pressure relief switch assembly is opened, auxiliary piston sealing is relieved, high-pressure oil in an expansion cavity returns to a main piston cavity, and the leakage-free overload pressure relief protection function is achieved; during resetting, the pressure relief switch assembly is closed, pressurization can be achieved by screwing the main piston screw again, and the auxiliary piston is used for sealing after pressurization is completed. The device adopts an oil liquid internal circulation structure, and has the advantages of being clean, environment-friendly, free of oil pollution, safe and simple to operate, sensitive in response, rapid to replace, maintain and reset and the like, accurate in overload torque regulation and control, easy in module serialization design, free of external oil supply equipment, low in cost and the like.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic safety couplings, and particularly relates to an oil-liquid internal circulation type hydraulic safety coupling. BACKGROUND

[0002] The hydraulic safety coupling is a safety coupling or torque limiter which uses the friction force generated by hydraulic expansion to transmit torque, has the advantages of small residual torque after overloading pressure relief, simple structure, convenient use and the like, and is widely used. However, the current hydraulic safety coupling is externally supplied with oil, and has a shear pipe and a shear ring structure for spilling the oil when pressure relief, so that the oil splashes and pollutes the environment. In addition, the operation steps are numerous when in use or reset, the pressurizing equipment is expensive, the operation risk is large, the disengagement torque adjustment is not accurate, and leakage is easy. In view of this situation, the oil-liquid internal circulation type hydraulic safety coupling is designed. SUMMARY

[0003] The application aims to provide an oil-liquid internal circulation type hydraulic safety coupling to solve the problems in the background.

[0004] To achieve the above-mentioned purpose, the application provides the following technical scheme: an oil-liquid internal circulation type hydraulic safety coupling, comprising a flange shaft, an expansion sleeve assembly, a flange shaft sleeve, a limiting end cover and an end cover connecting screw, wherein the end cover connecting screw connects the flange shaft and the limiting end cover together.

[0005] The expansion sleeve assembly comprises an expansion sleeve, a pressure relief switch assembly, a plug screw one, a sealing steel ball one, a main piston, a main piston screw, a limiting screw, a plug screw two and a sealing steel ball two.

[0006] The pressure relief switch assembly comprises a limiting hollow screw, a trigger force arm rod, an outer thread inner spline sleeve, a buffer rubber pad, an inner thread outer spline sleeve, a secondary piston screw and a secondary piston.

[0007] The left flange plate is arranged on the left side of the flange shaft, a driving tooth, a limiting shaft shoulder and a hollow shaft are arranged on the right side of the left flange plate, the driving tooth is located outside the limiting shaft shoulder, and an end cover connecting thread hole is arranged on the right end face of the hollow shaft.

[0008] The shaft sleeve is arranged on the left side of the flange shaft sleeve, a right flange plate is arranged on the right end of the shaft sleeve, and a positioning flange is arranged on the inner side of the right end of the shaft sleeve.

[0009] The limiting end cover is provided with a positioning boss on the left side, a limiting disc is arranged on the right end of the positioning boss, and a connecting hole is arranged on the right end face of the limiting disc.

[0010] One side of the expansion sleeve is provided with a flange, and the other side is provided with a sandwich structure comprising an inner cylindrical surface, an outer cylindrical surface and an expansion cavity.

[0011] The inner cylindrical surface of the expansion sleeve is clearance-fitted with the hollow shaft of the flange shaft, and the outer cylindrical surface of the expansion sleeve is clearance-fitted with the bushing of the flange shaft sleeve. The right side of the limiting shoulder of the flange shaft is fitted and limited by the left side of the flange of the expansion sleeve. The left side of the positioning boss of the limiting end cover is tightly fitted with the right end face of the hollow shaft, and is connected as one unit by the end cover connecting screw and the end cover connecting threaded hole. The left side of the positioning flange of the flange shaft sleeve is close to the right end face of the expansion sleeve, and the right side is loosely fitted with the left side of the limiting plate.

[0012] The flange of the expansion sleeve is provided with a first sealing threaded hole, a limiting threaded hole, a main piston threaded hole, a second sealing threaded hole, and a secondary piston threaded hole; the bottom of the main piston threaded hole is provided with a main piston hole, the bottom of the secondary piston threaded hole is provided with a smooth hole, and the bottom of the smooth hole is provided with a secondary piston hole; the bottom of the secondary piston hole is connected to the expansion chamber, the bottom of the main piston hole is provided with an oil passage, the oil passage is connected to the bottom of the main piston hole, the bottom of the second sealing threaded hole, and the side wall of the secondary piston hole, and the bottom of the first sealing threaded hole is connected to the expansion chamber;

[0013] The first plug screw and the first sealing steel ball are engaged with the first sealing threaded hole, with the first sealing steel ball located at the bottom of the first plug screw; the main piston is in sealing engagement with the main piston hole, and the main piston screw is in threaded engagement with the main piston threaded hole; the limit screw is in threaded engagement with the limit threaded hole; the second plug screw and the second sealing steel ball are engaged with the second sealing threaded hole, with the second sealing steel ball located at the bottom of the second plug screw.

[0014] The limiting hollow screw has a lever arm limiting flange at one end and an external thread at the other end, and a through internal hexagonal hole on the end face.

[0015] The upper end face of the trigger lever is provided with a through internal spline hole, and the left side is provided with a protruding contact end;

[0016] The outer side of the external threaded internal spline sleeve is threaded, the inner side is provided with internal spline two, and the inner side of the right end is provided with a limiting inner flange.

[0017] The buffer rubber pad has an elastic buffer block on its outer ring.

[0018] The lower end of the internal threaded external spline sleeve is provided with a large external spline, the upper end with a small external spline, and the end face is provided with a through internal threaded hole.

[0019] The bottom of the auxiliary piston is provided with a spherical protrusion.

[0020] The auxiliary piston mates with the auxiliary piston bore, with the spherical protrusion facing the bottom of the auxiliary piston bore; the elastic buffer blocks of the buffer rubber pads are respectively engaged in the tooth gaps of the second internal spline and fit tightly; the small external spline end of the internal thread external spline sleeve passes through the inner hole of the external thread internal spline sleeve, and the top surface of the upper tooth of the large external spline is directly opposite the bottom surface of the lower tooth of the second internal spline; the thread of the external thread internal spline sleeve mates with the threaded hole of the auxiliary piston of the expansion sleeve, the smooth hole is clearance-fitted with the outer surface of the large external spline, and the auxiliary piston screw mates with the threaded hole of the internal thread external spline sleeve. The bottom of the pin contacts the top of the auxiliary piston; the internal spline hole of the trigger lever mates with the small external spline of the internal thread external spline sleeve, and the lower surface of the trigger lever contacts the upper surface of the external thread internal spline sleeve; the external thread of the limit hollow screw is threadedly connected to the internal thread hole of the internal thread external spline sleeve, and there is a gap between the limit flange of the limit hollow screw and the upper end face of the trigger lever; the distance between the opposite sides of the internal hexagonal hole of the limit hollow screw is greater than the distance between the opposite sides of the internal hexagonal hole of the auxiliary piston screw; the contact end of the trigger lever is locked in the space between the two actuating teeth.

[0021] The technical effects and advantages of this invention are as follows: This internal oil circulation hydraulic safety coupling can compress the oil in the main piston chamber by pushing the main piston screw, filling the expansion chamber of the tightening sleeve with high-pressure oil at a specific pressure. Then, the auxiliary piston seals the chamber and retracts the main piston screw, eliminating the need for an external high-pressure oil supply. Furthermore, the pressure relief switch assembly detects relative slippage between the coupling flange shaft and the tightening sleeve assembly. When slippage occurs, the pressure relief switch assembly opens, releasing the auxiliary piston seal and returning the high-pressure oil in the expansion chamber to the main piston chamber, achieving a leak-free overload pressure relief protection function. For reset, the pressure relief switch assembly is closed, and the main piston screw is retightened to apply pressure. After pressurization, the auxiliary piston seals the chamber. This device, employing an internal oil circulation structure, offers advantages such as cleanliness and environmental friendliness (no oil pollution), safe and simple operation, sensitive response, quick replacement, maintenance, and reset, precise overload torque control, ease of modular design, and low cost due to the absence of external oil supply equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall component assembly of the present invention;

[0023] Figure 2 This is a schematic diagram of the flange shaft structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the expansion sleeve assembly of the present invention;

[0025] Figure 4 This is a schematic diagram of the expansion sleeve structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the pressure relief switch assembly of the present invention;

[0027] Figure 6This is a schematic diagram of the limiting hollow screw structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the trigger lever structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the external thread internal spline sleeve structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the buffer rubber pad structure of the present invention;

[0031] Figure 10 This is a schematic diagram of the internal thread external spline sleeve structure of the present invention;

[0032] Figure 11 This is a schematic diagram of the auxiliary piston structure of the present invention;

[0033] Figure 12 This is a schematic diagram of the flange bushing structure of the present invention;

[0034] Figure 13 This is a schematic diagram of the limiting end cap structure of the present invention;

[0035] In the picture:

[0036] 1. Flange shaft; 1-1. Left flange; 1-2. Actuating gear; 1-3. Limiting shoulder; 1-4. Hollow shaft; 1-5. End cover connecting threaded hole; 2. Expansion sleeve assembly; 2-1. Expansion sleeve; 2-1-1. Flange; 2-1-2. Inner cylindrical surface; 2-1-3. Outer cylindrical surface; 2-1-4. Expansion chamber; 2-1-5. Sealing threaded hole one; 2-1-6. Limiting threaded hole; 2-1-7. Main piston threaded hole; 2-1-8. Main piston hole; 2- 1-9. Oil passage; 2-1-10. Threaded plug hole 2; 2-1-11. Threaded hole of auxiliary piston; 2-1-12. Plain hole; 2-1-13. Auxiliary piston hole; 2-2. Pressure relief switch assembly; 2-2-1. Hollow limit screw; 2-2-1-1. Socket hexagon hole; 2-2-1-2. External thread; 2-2-1-3. Lever arm limit flange; 2-2-2. Trigger lever; 2-2-2-1. Internal spline hole; 2-2-2-2. Contact end ; 2-2-2-3, Upper end face; 2-2-3, External thread internal spline sleeve; 2-2-3-1, Internal spline two; 2-2-3-2, Thread; 2-2-3-3, Limiting inner flange; 2-2-4, Buffer rubber pad; 2-2-4-1, Elastic buffer block; 2-2-5, Internal thread external spline sleeve; 2-2-5-1, Internal thread hole; 2-2-5-2, Small external spline; 2-2-5-3, Large external spline; 2-2-6, Secondary piston screw; 2- 2-7. Secondary piston; 2-2-7-1. Spherical protrusion; 2-3. Plug screw one; 2-4. Sealing steel ball one; 2-5. Main piston; 2-6. Main piston screw; 2-7. Limit screw; 2-8. Plug screw two; 2-9. Sealing steel ball two; 3. Flange bushing; 3-1. Bushing; 3-2. Right flange; 3-3. Positioning flange; 4. Limiting end cover; 4-1. Positioning boss; 4-2. Limiting plate; 4-3. Connecting hole; 5. End cover connecting screw; Detailed Implementation

[0037] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] Furthermore, 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 technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0040] The present invention will describe the installation, use, reset principle and function in conjunction with the accompanying drawings.

[0041] Installation instructions for this invention:

[0042] Step 1: Assembly of the expansion sleeve assembly 2 (reference) Figures 3-11 First, push the auxiliary piston 2-2-7 into the auxiliary piston hole 2-1-13. Then, insert the end of the internally threaded external spline sleeve 2-2-5 with the large external spline 2-2-5-3 into the smooth hole 2-1-12. Next, place the buffer rubber pad 2-2-4 between the teeth of the internal spline 2-2-3-1 of the externally threaded internal spline sleeve 2-2-3 and press it down completely. Then, screw the combination of the externally threaded internal spline sleeve 2-2-3 and the buffer rubber pad 2-2-4 into the auxiliary piston threaded hole 2-1-11 with the internal spline 2-2-3-1 end face down until it contacts the bottom and secure it with adhesive. Then, adjust the upper top surface of the large external spline 2-2-5-3 spline tooth of the internally threaded external spline sleeve 2-2-5 and the internal spline 2-2-5-1 spline tooth of the externally threaded internal spline sleeve 2-2-3. The bottom surfaces of the spline teeth of 2-3-1 should be aligned and not slip during compression, and a positioning mark should be made. Then, screw the auxiliary piston screw 2-2-6 into the internal thread hole 2-2-5-1 of the internal thread external spline sleeve 2-2-5 until it just contacts the auxiliary piston 2-2-7. Next, install the trigger lever 2-2-2 onto the small external spline 2-2-5-3 of the internal thread external spline sleeve 2-2-5, so that when the internal thread external spline sleeve 2-2-5 rotates to the marked position, the contact end 2-2-2-2 of the trigger lever 2-2-2 should be basically parallel to the axis of the tightening sleeve 2-1-1. Finally, screw the limiting hollow screw 2-2-1 into the internal thread hole 2-2-5-1 of the internal thread external spline sleeve 2-2-5 to limit the trigger lever 2-2-2. At this point, the pre-assembly of the pressure relief switch assembly 2-2 is complete.

[0043] (refer to Figure 3 , Figure 4 Further, insert the sealing steel ball 2-9 into the sealing threaded hole 2-1-10, and then screw in the plug screw 2-8 to press the sealing steel ball 2-9 tightly, thus completing the sealing of the threaded hole 2-1-10.

[0044] (refer to Figure 3 , Figure 4 Then, inject grease through the sealing threaded hole 2-1-5 to sequentially expel air from the expansion chamber 2-1-4, the auxiliary piston hole 2-1-13, the oil passage 2-1-9, and the main piston hole 2-1-8, filling them with grease. Next, push the main piston 2-5 into the main piston hole 2-1-8, and further screw the main piston screw 2-6 into the main piston threaded hole 2-1-7. Push the main piston 2-5 until the limit screw 2-7 is screwed into the limit threaded hole 2-1-6 without interfering with the main piston screw 2-6. This completes the pre-assembly of the main piston section.

[0045] (refer to Figure 3 , Figure 4 Finally, insert the sealing steel ball 2-4 into the sealing threaded hole 2-1-5, and then screw in the plug screw 2-3 to press the sealing steel ball 2-4 tightly, completing the sealing of the threaded hole 2-1-5. This completes the assembly of the expansion sleeve assembly 2.

[0046] Step 2: Assemble the entire coupling (see reference) Figures 1-4 , Figure 12 , Figure 13 First, mate the inner cylindrical surface 2-1-2 of the expansion sleeve 2-1 with the hollow shaft 1-4 of the flange shaft 1, and make the left side of the flange 2-1-1 tightly against the limiting shoulder 1-3. Then, mate the bushing 3-1 of the flange bushing 3 with the outer cylindrical surface 2-1-3 of the expansion sleeve 2-1. Then, fix the limiting end cover 4 to the right end face of the hollow shaft 1-4 of the flange shaft 1 with the end cover connecting screw 5. Under the restriction of the limiting end cover 4, the positioning flange 3-3 of the flange bushing 3 can only rotate relative to each other and will not slide axially. This completes the overall assembly of the coupling.

[0047] Instructions for use of this invention:

[0048] In use, the first step is to connect the flange 1-1 of the flange shaft 1 to the corresponding flange on the driving end. Similarly, connect the flange 3-2 of the flange sleeve 3 to the corresponding flange on the driven end. By rotating the expansion sleeve assembly 2, the contact end 2-2-2-2 of the trigger lever 2-2-2 is engaged in the space between two adjacent actuating teeth 1-2 on the flange shaft 1, and the direction of the contact end 2-2-2-2 of the trigger lever 2-2-2 is basically parallel to the axis of the expansion sleeve 2-1-1. Then, by tightening the main piston screw 2-6 with a torque wrench, the main piston 2-5 is pushed to compress the grease in the main piston hole 2-1-8. The grease enters through the oil passage 2-1-9 from the side wall hole of the auxiliary piston hole 2-1-13. Since the auxiliary piston has not yet been compressed and sealed, the side wall and bottom oil passage of the auxiliary piston hole 2-1-13 are still connected. At this time, the grease further enters the expansion chamber 2-1-4 through the bottom oil passage of the auxiliary piston hole 2-1-13; at the same time, the auxiliary piston 2-2- 7. Under the action of high-pressure grease, the auxiliary piston screw 2-2-6 is pushed to further press the upper top surface of the large external spline 2-2-5-3 of the internal thread external spline sleeve 2-2-5 against the lower surface of the internal spline 2-2-3-1 of the external thread internal spline sleeve 2-2-3. As the main piston 2-5 advances, the oil pressure in the expansion chamber 2-1-4 gradually increases, causing the inner cylindrical surface 2-1-2 and the outer cylindrical surface 2-1-3 of the expansion sleeve 2-1 to respectively press against the hollow shaft 1-4 and the bushing. 3-1 The contact point allows for the transmission of frictional torque. When the torque wrench reading reaches the rated tightening torque, tighten the auxiliary piston screw 2-2-6 to push the auxiliary piston 2-2-7 against the bottom of the auxiliary piston hole 2-1-13. The spherical protrusion 2-2-7-1 blocks the bottom oil passage, severing the connection between the side wall and the bottom oil passage of the auxiliary piston hole 2-1-13. Then, retract the main piston screw 2-6 until it just contacts the limit screw 2-7. At this point, the pressure inside the main piston hole 2-1-8 returns to normal pressure. This process requires no external pressurization equipment, is environmentally friendly and pollution-free, saves significant costs, and improves operational safety.

[0049] On the other hand, if precise adjustment of the overload limiting torque is required, before pressurization, the sealing steel ball 2-9 and the plug screw 2-8 can be removed and replaced with a hydraulic gauge or hydraulic sensor. After pressurization is completed and the main piston screw 2-6 is retracted until the pressure inside the main piston hole 2-1-8 returns to normal pressure, the hydraulic gauge or hydraulic sensor can be removed. Then, the sealing steel ball 2-9 and the plug screw 2-8 can be reinstalled to complete the sealing of the threaded hole 2-1-10. Therefore, the present invention has the advantages of simple operation and precise control.

[0050] When overloaded, friction cannot provide the required torque, causing slippage between the hollow shaft 1-4 of flange shaft 1 and the inner cylindrical surface 2-1-2 of expansion sleeve 2-1. At this time, the actuating tooth 1-2 on the left flange 1-1 actuates the contact end 2-2-2-2 of the trigger lever 2-2-2, causing the trigger lever 2-2-2 to rotate the internal thread external spline sleeve 2-2-5 relative to the external thread internal spline sleeve 2-2-3. This causes the upper top surface of the large external spline 2-2-5-3 spline teeth and the lower bottom surface of the spline teeth of the inner spline 2-2-3-1 to misalign. When the misalignment reaches a certain extent, the large external spline 2-2-5-3 spline teeth slide into the spline tooth gap of the inner spline 2-2-3-1, no longer providing the axial constraint required for the locking seal of the secondary piston 2-2-7. Simultaneously, the auxiliary piston 2-2-7, driven by the high-pressure grease in the expansion chamber 2-1-4, will cause the auxiliary piston screw 2-2-6 to move outward, further driving the internal thread external spline sleeve 2-2-5 to move axially relative to the external thread internal spline sleeve 2-2-3. At this time, the buffer rubber pad 2-2-4 will buffer the impact of the internal thread external spline sleeve 2-2-5 and force the internal thread external spline sleeve 2-2-5 to stop moving. Due to the retraction of the auxiliary piston 2-2-7, the side wall and bottom oil passage of the auxiliary piston hole 2-1-13 are reconnected. The high-pressure grease will return to the main piston hole 2-1-8 through the oil passage 2-1-9 and push the main piston 2-5 to retract until the internal hydraulic pressure of the expansion chamber 2-1-4 returns to normal pressure, and the main piston 2-5 will stop moving. At this point, the inner cylindrical surface 2-1-3 and the outer cylindrical surface 2-1-4 of the expansion sleeve 2-1, which were originally in compression contact, resume clearance fit, further enabling the coupling to slip without resistance and achieving the overload relief and low residual torque protection function. Since there is no oil leakage during this process and the above action time is extremely short, it has the advantages of being environmentally friendly, pollution-free, and having a sensitive response.

[0051] On the other hand, when the machine is shut down for maintenance, if pressure relief of the coupling is required, simply unscrew the auxiliary piston screw 2-2-6 to slowly release the pressure, allowing the high-pressure oil to return to the main piston hole 2-1-8, thus achieving convenient manual pressure relief. Therefore, the operation is very convenient.

[0052] Introduction to the reset function of this invention:

[0053] When resetting is required after overload or manual depressurization, first retract the auxiliary piston screw 2-2-6 by 3-5mm. Then, push the internal thread external spline sleeve 2-2-5 downwards until it and the external thread internal spline sleeve 2-2-3 can rotate relative to each other. Align the top surface of the misaligned large external spline 2-2-5-3 spline teeth with the bottom surface of the internal spline 2-2-3-1 spline teeth using the positioning marks. Simultaneously, adjust the trigger lever 2-2-2 so that the contact end 2-2-2-2 is re-engaged in the space between the two adjacent actuating teeth 1-2 on the flange shaft 1. Then, repeat the above steps of pressurizing, locking the seal, and retracting the piston to complete the reset. Therefore, reset maintenance is quick, environmentally friendly, and safe, greatly reducing downtime losses.

[0054] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulic safety coupling with internal oil circulation, characterized in that: It includes a flange shaft (1), a shrink sleeve assembly (2), a flange bushing (3), a limiting end cap (4), and an end cap connecting screw (5), wherein the end cap connecting screw (5) connects the flange shaft (1) and the limiting end cap (4) together; The expansion sleeve assembly (2) includes an expansion sleeve (2-1), a pressure relief switch assembly (2-2), a plug screw one (2-3), a sealing steel ball one (2-4), a main piston (2-5), a main piston screw (2-6), a limit screw (2-7), a plug screw two (2-8), and a sealing steel ball two (2-9); The pressure relief switch assembly (2-2) includes a limit hollow screw (2-2-1), a trigger lever (2-2-2), an external thread internal spline sleeve (2-2-3), a buffer rubber pad (2-2-4), an internal thread external spline sleeve (2-2-5), a secondary piston screw (2-2-6), and a secondary piston (2-2-7).

2. The hydraulic safety coupling with internal oil circulation according to claim 1, characterized in that: The flange shaft (1) is provided with a left flange (1-1) on the left side, and a moving tooth (1-2), a limiting shoulder (1-3) and a hollow shaft (1-4) on the right side of the left flange (1-1). The moving tooth (1-2) is located outside the limiting shoulder (1-3), and the right end face of the hollow shaft (1-4) is provided with an end cap connecting threaded hole (1-5). The flange sleeve (3) has a sleeve (3-1) on the left side, a right flange (3-2) on the right end of the sleeve (3-1), and a positioning flange (3-3) on the inner side of the right end of the sleeve (3-1). The limiting end cap (4) has a positioning boss (4-1) on the left side, a limiting plate (4-2) on the right side of the positioning boss (4-1), and a through connecting hole (4-3) on the right end face of the limiting plate (4-2). The expansion sleeve (2-1) has a flange (2-1-1) on one side and a sandwich structure including an inner cylindrical surface (2-1-2), an outer cylindrical surface (2-1-3), and an expansion cavity (2-1-4) on the other side; The inner cylindrical surface (2-1-2) of the expansion sleeve (2-1) is clearance-fitted with the hollow shaft (1-4) of the flange shaft (1), the outer cylindrical surface (2-1-3) of the expansion sleeve (2-1) is clearance-fitted with the bushing (3-1) of the flange bushing (3), the right side of the limiting shoulder (1-3) of the flange shaft (1) is fitted and limited with the left side of the flange (2-1-1) of the expansion sleeve (2-1), the left side of the positioning boss (4-1) of the limiting end cover (4) is tightly fitted with the right end face of the hollow shaft (1-4), and is connected as one unit by the end cover connecting screw (5) and the end cover connecting threaded hole (1-5). The left side of the positioning flange (3-3) of the flange bushing (3) is close to the right end face of the expansion sleeve, and the right side is loosely fitted with the left side of the limiting plate (4-2).

3. The hydraulic safety coupling with internal oil circulation according to claim 1, characterized in that: The expansion sleeve (2-1) has a flange (2-1-1) with a sealing threaded hole one (2-1-5), a limiting threaded hole (2-1-6), a main piston threaded hole (2-1-7), a sealing threaded hole two (2-1-10), and a secondary piston threaded hole (2-1-11); the main piston threaded hole (2-1-7) has a main piston hole (2-1-8) at its bottom, and the secondary piston threaded hole (2-1-11) has a smooth hole (2-1-12) at its bottom. 12) A secondary piston hole (2-1-13) is provided at the bottom; the bottom of the secondary piston hole (2-1-13) is connected to the expansion chamber (2-1-4), and an oil passage (2-1-9) is provided at the bottom of the main piston hole (2-1-8). The oil passage (2-1-9) is connected to the bottom of the main piston hole (2-1-8), the bottom of the second sealing threaded hole (2-1-10), and the side wall of the secondary piston hole (2-1-13). The bottom of the first sealing threaded hole (2-1-5) is directly connected to the expansion chamber (2-1-4). The first plug screw (2-3) and the first sealing steel ball (2-4) are engaged with the first sealing threaded hole (2-1-5), with the first sealing steel ball (2-4) located at the bottom of the first plug screw (2-3); the main piston (2-5) is in a sealing engagement with the main piston hole (2-1-8), and the main piston screw (2-6) is in a threaded engagement with the main piston threaded hole (2-1-7); the limit screw (2-7) is in a threaded engagement with the limit threaded hole (2-1-6); the second plug screw (2-8) and the second sealing steel ball (2-9) are engaged with the second sealing threaded hole (2-1-10), with the second sealing steel ball (2-9) located at the bottom of the second plug screw (2-8).

4. The hydraulic safety coupling with internal oil circulation according to claim 1, characterized in that: The limiting hollow screw (2-2-1) has a lever arm limiting flange (2-2-1-3) at one end and an external thread (2-2-1-2) at the other end, and a through internal hexagonal hole (2-2-1-1) on the end face; The upper end face (2-2-2-3) of the trigger lever (2-2-2) is provided with a through internal spline hole (2-2-2-1), and a protruding contact end (2-2-2-2) is provided on the left side; The external threaded inner spline sleeve (2-2-3) has a thread (2-2-3-2) on the outside and an inner spline (2-2-3-1) on the inside. The inner side of the right end has a limiting inner flange (2-2-3-3). The buffer rubber pad (2-2-4) has an outer ring with an elastic buffer block (2-2-4-1); The lower end of the internal threaded external spline sleeve (2-2-5) is provided with a large external spline (2-2-5-3), the upper end is provided with a small external spline (2-2-5-2), and the end face is provided with a through internal threaded hole (2-2-5-1). The bottom of the auxiliary piston (2-2-7) is provided with a spherical protrusion (2-2-7-1).

5. The hydraulic safety coupling with internal oil circulation according to claim 1, characterized in that: The auxiliary piston (2-2-7) mates with the auxiliary piston hole (2-1-13), with the spherical protrusion (2-2-7-1) facing the bottom of the piston hole (2-1-13); the elastic buffer blocks (2-2-4-1) of the buffer rubber pad (2-2-4) respectively engage with the tooth gaps of the inner spline two (2-2-3-1) and fit tightly; the small external spline (2-2-5-2) end of the internal threaded external spline sleeve (2-2-5) passes through the inner hole of the external threaded internal spline sleeve (2-2-3), and the large external spline (2-2... -5-3) The top surface of the upper tooth is directly opposite the lower surface of the lower tooth of the inner spline 2 (2-2-3-1); the thread (2-2-3-2) of the external thread inner spline sleeve (2-2-3) is threaded into the auxiliary piston threaded hole (2-1-11) of the expansion sleeve (2-1); the smooth hole (2-1-12) is clearance-fitted with the outer side of the large external spline (2-2-5-3); the auxiliary piston screw (2-2-6) is threaded into the internal threaded hole (2-2-5-1) of the internal thread outer spline sleeve (2-2-5); the auxiliary piston screw... (2-2-6) The bottom of the trigger lever (2-2-6) contacts the top of the auxiliary piston (2-2-7); the internal spline hole (2-2-2-1) of the trigger lever (2-2-2) mates with the small external spline (2-2-5-2) of the internal thread external spline sleeve (2-2-5); the lower surface of the trigger lever (2-2-2) contacts the upper surface of the external thread internal spline sleeve (2-2-3); the external thread (2-2-1-2) of the limit hollow screw (2-2-1) mates with the internal thread hole (2-2-5) of the internal thread external spline sleeve (2-2-5). 2-2-5-1) Threaded connection, the limiting flange (2-2-1-3) of the limiting hollow screw (2-2-1) and the upper end face (2-2-2-3) of the trigger lever (2-2-2) are provided with a gap; the distance between the opposite sides of the internal hexagonal hole (2-2-1-3) of the limiting hollow screw (2-2-1) is greater than the distance between the opposite sides of the internal hexagonal hole of the auxiliary piston screw (2-2-6); the contact end (2-2-2-2) of the trigger lever (2-2-2) is locked in the space between the two actuating teeth (1-2).

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