阅读说明：本技术 一种机车闭门器及弹簧压力调节结构的加工组装方法 (Machining and assembling method for locomotive door closer and spring pressure adjusting structure ) 是由 莫文信 游贺东 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种能调节弹簧压力的机车闭门器及弹簧压力调节结构的加工组装方法,其中机车闭门器,包括缸体和设置在缸体内腔中的弹簧,在缸体的一端上转动连接有调压杆,调压杆的一端伸入到缸体内腔中,在位于缸体内腔中的调压杆外周面上螺纹连接有位移螺母,弹簧与位移螺母支撑接触,其特征在于：所述机车闭门器内还设置有弹簧压力调节结构,所述弹簧压力调节结构包括设置在位移螺母的周面上的周向限位杆和在缸体内腔壁上开设的与所述周向限位杆配合的限位滑槽,周向限位杆的一端插入到位移螺母的周面上与位移螺母连接固定,周向限位杆的另外一端外露于位移螺母的周面且伸入限位滑槽中与限位滑槽滑动配合连接。(The invention discloses a locomotive door closer capable of adjusting spring pressure and a processing and assembling method of a spring pressure adjusting structure, wherein the locomotive door closer comprises a cylinder body and a spring arranged in an inner cavity of the cylinder body, one end of the cylinder body is rotatably connected with a pressure adjusting rod, one end of the pressure adjusting rod extends into the inner cavity of the cylinder body, the peripheral surface of the pressure adjusting rod positioned in the inner cavity of the cylinder body is in threaded connection with a displacement nut, and the spring is in supporting contact with the displacement nut, and the locomotive door closer is characterized in that: still be provided with spring pressure regulation structure in the locomotive door closer, spring pressure regulation structure including set up the circumference gag lever post on displacement nut global and set up on the cylinder body inner chamber wall with the spacing spout of circumference gag lever post complex, the one end of circumference gag lever post is inserted and is connected fixedly with displacement nut on displacement nut global, and the other one end of circumference gag lever post exposes in displacement nut global and stretches into in the spacing spout and be connected with spacing spout sliding fit.)

1. The utility model provides a locomotive door closer, includes the cylinder body and sets up the spring in the cylinder body inner chamber, rotates to be connected with pressure regulating rod in the one end of cylinder body, and pressure regulating rod's one end stretches into the cylinder body inner chamber, and threaded connection has displacement nut on the pressure regulating rod outer peripheral face that lies in the cylinder body inner chamber, and the spring supports contact, its characterized in that with displacement nut: still be provided with spring pressure regulation structure in the locomotive door closer, spring pressure regulation structure including set up the circumference gag lever post on displacement nut global and set up on the cylinder body inner chamber wall with the spacing spout of circumference gag lever post complex, the one end of circumference gag lever post is inserted and is connected fixedly with displacement nut on displacement nut global, and the other one end of circumference gag lever post exposes in displacement nut global and stretches into in the spacing spout and be connected with spacing spout sliding fit.

2. The locomotive door closer of claim 1, wherein: the peripheral surface of the displacement nut is provided with a screw hole, the circumferential limiting rod adopts a screw, the screw part of the screw is screwed into the screw hole, the head part of the screw extends into the limiting sliding groove, and the groove shape of the limiting sliding groove is matched with the head part of the screw.

3. The locomotive door closer of claim 2, wherein: the two circumferential limiting rods and the two limiting sliding grooves are arranged, a first screw hole and a second screw hole are respectively formed in the two opposite sides of the displacement nut, the central axes of the first screw hole and the second screw hole are overlapped, each screw comprises a first screw and a second screw, the first screw is installed in the first screw hole, and the second screw is installed in the second screw hole.

4. The locomotive door closer of claim 1, wherein: the pressure regulating rod comprises a rod body and a flange arranged on the rod body, the rod body positioned at one side of the flange is the rod part of the pressure regulating rod, the rod body positioned at the other side of the flange is the head part of the pressure regulating rod, and external threads are arranged on the rod part of the pressure regulating rod; the cylinder body is provided with a mounting through hole at one end part, and the head part of the pressure regulating rod is inserted into the mounting through hole to be connected in a rotating fit manner, so that the pressure regulating rod can be rotatably connected to one end of the cylinder body.

5. The locomotive door closer of claim 4, wherein: the sealing ring is arranged at the inner end part of the cylinder body at the mounting through hole, the gasket is arranged between the sealing ring and the flange of the pressure regulating rod, the displacement nut is in threaded connection with the rod part of the pressure regulating rod, the spring is supported and contacted with the displacement nut, so that the axial extrusion force is applied to the displacement nut by the spring force of the spring and is transmitted to the pressure regulating rod through the displacement nut, and finally the gasket and the sealing ring are sequentially pressed by the flange of the pressure regulating rod to form a sealing structure.

6. The locomotive door closer of any one of claims 1 to 5, wherein: the locomotive door closer also comprises a rack hook fastener arranged in the inner cavity of the cylinder body, one end of the rack hook fastener is provided with a piston body, the inner cavity of the cylinder body is divided into two cavities, namely a cavity I and a cavity II, through the piston body, the cylinder body is also provided with a flow channel I and a flow channel II which are mutually independent, the cavity I is mutually communicated with the cavity II through the flow channel I, and the cavity I is mutually communicated with the cavity II through the flow channel II; the piston body is also provided with a one-way valve which communicates the first cavity with the second cavity, so that hydraulic oil in the second cavity can enter the first cavity through the one-way valve; the spring is arranged between the other end of the rack hook fastener and the end wall of the inner cavity of the cylinder body, a cylindrical gear shaft is rotatably connected to the cylinder body, the central axis of the cylindrical gear shaft is perpendicular to the central axis of the cylinder body, the cylindrical gear shaft penetrates through the inner cavity of the cylinder body, one end of the cylindrical gear shaft is exposed out of the cylinder body, a rack is arranged on the rack hook fastener, and the rack is connected with a rack on the rack hook fastener in a meshed mode through the cylindrical gear shaft.

7. The locomotive door closer of claim 6, wherein: the first inlet of the first flow channel and the second inlet of the second flow channel are both arranged in the first cavity, the position of the second inlet is arranged at the end part close to one end of the cylinder body, the position of the first inlet is arranged at the end part far away from one end of the cylinder body, and the first outlet of the first flow channel and the second outlet of the second flow channel are both arranged in the second cavity; when the rack hook shell starts to move, hydraulic oil in the cavity I can enter through the inlet I and the inlet II at the same time and flow into the cavity II through the outlet I and the outlet II;

when the piston body of the rack hook shell moves to be close to one end of the cylinder body, the first inlet is blocked by the piston body, and at the moment, hydraulic oil in the first cavity can only enter from the second inlet and flow into the second cavity through the second outlet.

8. A processing and assembling method of a spring pressure adjusting structure is characterized in that: the blind hole type cylinder is characterized in that an installation through hole is formed in the end part of the closed end of the blind hole-shaped cylinder body, a limiting rod installation hole is formed in the side part of the cylinder body, a blind hole is formed in the position, close to the installation through hole, of the end part of the closed end of the cylinder body, the central axis of the blind hole and the central axis of an inner cavity of the cylinder body are not on the same straight line, a limiting sliding groove is formed in the wall of the inner cavity of the cylinder body after the blind hole is machined, and the limiting rod installation hole;

then, assembling the displacement nut and the pressure regulating rod, and putting the assembled displacement nut and the pressure regulating rod into an inner cavity of the cylinder body from one end of the opening of the cylinder body together, so that the head of the pressure regulating rod is inserted into the mounting through hole of the cylinder body to be connected in a rotating fit manner;

after the displacement nut and the pressure regulating rod are installed, the circumferential limiting rod is inserted into the displacement nut from the limiting rod installation hole in the circumferential direction, so that one end of the circumferential limiting rod is connected with the displacement nut, the other end of the circumferential limiting rod is located in the limiting sliding groove and is in sliding connection with the limiting sliding groove in a matched mode, and machining and assembling of the spring pressure regulating structure are completed.

9. The machining and assembling method of a spring pressure adjusting structure according to claim 8, wherein: the circumferential limiting rod is a screw, a screw hole is formed in the outer circumferential surface of the displacement nut, and after the displacement nut and the pressure regulating rod are installed, the screw is screwed into the displacement nut in the circumferential direction through the limiting rod installation hole.

10. The machining and assembling method of a spring pressure adjusting structure according to claim 9, characterized in that: the screw comprises a first screw and a second screw, the limiting rod mounting hole and the limiting sliding groove are both provided with two screw holes, and the screw holes comprise a first screw hole and a second screw hole which are arranged on two opposite sides of the displacement nut;

after the displacement nut and the pressure regulating rod are installed, the screw hole I is aligned with one limiting rod installation hole, and the screw hole II is aligned with the other limiting rod installation hole; the first screw penetrates through the first limiting rod mounting hole and is screwed into the first screw hole, the second screw penetrates through the other limiting rod mounting hole and is screwed into the second screw hole, the screw rod portion of the first screw is screwed into the first screw hole, the head portion of the first screw is located in one limiting sliding groove and is in matched sliding connection, the screw rod portion of the second screw is screwed into the second screw hole, and the head portion of the second screw is located in the other limiting sliding groove and is in matched sliding connection.

Technical Field

The invention relates to a locomotive door closer and a processing and assembling method, in particular to a locomotive door closer capable of adjusting spring pressure and a processing and assembling method of a spring pressure adjusting structure.

Background

The door closer is a hydraulic press similar to a spring on the door head, can be released after being compressed after the door is opened, automatically closes the door, has the effect like a spring door, and can ensure that the door is accurately and timely closed to an initial position after being opened. The modern hydraulic door closer (door closer for short) starts a patent registered by Americans in the early twentieth century, is different from the traditional door closer, and achieves a buffering effect by throttling liquid in the door closer. The core of the design idea of the hydraulic door closer is to realize the control of the door closing process, so that various functional indexes of the door closing process can be adjusted according to the requirements of people.

Since a plurality of doors are provided in a vehicle, the door closer is widely used in the vehicle. However, because the materials of the locomotive doors are different, for example, some locomotive doors are made of aluminum alloy welded structures, some locomotive doors are made of iron materials, and other locomotive doors are made of carbon fiber materials, the weight of the locomotive doors is inconsistent, and some locomotive doors are heavier and some locomotive doors are lighter. Therefore, if door closers with the same spring pressure are adopted, the problem of mismatching between the door closers and the locomotive door occurs, and therefore the locomotive door has a problem in the closing process.

Through search, the applicant finds that most of the door closers in the current patent application documents do not relate to the problem, and the spring pressure in most of the door closers is not adjustable at any time, such as the following patent documents:

the invention discloses a hidden fireproof door closer, which is disclosed in Chinese patent with publication number CN108118994A and publication date 2018, 6 and 5, which comprises a shell, a rotating arm and a buffer device, wherein the buffer device comprises a spring, a piston and a rotating shaft, the rotating shaft is connected with the rotating arm, the spring and the piston are both arranged in the shell, the rotating shaft is matched with the piston, the rotating shaft can rotate 0-170 degrees clockwise and anticlockwise relative to the piston, a first oil chamber and a second oil chamber are arranged in the shell and are respectively positioned on two sides of the buffer device, the spring is positioned in the second oil cavity, one end of the spring is abutted against the piston, the piston is provided with a cavity, the first oil chamber and the second oil chamber are communicated through an oil way and a piston, fan-shaped teeth are arranged on the rotating shaft, and the piston and the rotating shaft are provided with rotating teeth which are meshed with each other.

The Chinese utility model patent with the authorization notice number of CN205531908U and the authorization notice date of 2016, 8, 31 discloses a door closer with excellent performance, which comprises a buffer device, a swing arm, a connecting rod, a screw rod, a switching piece and a fixed block, wherein the buffer device comprises a cylinder body, a piston body, a gear shaft, a large spring, two end covers, a safety valve set, a check valve steel ball, three regulating valve sets and two shaft covers, wherein a piston cavity penetrating from one side to the other side is formed on the cylinder body, a mounting hole penetrating through the cylinder body is also formed on the cylinder body, the mounting hole is communicated with the piston cavity, and a plurality of oil ways are also arranged on the cylinder body; the piston body is of a dumbbell-shaped structure, a gear shaft moving hole penetrating from one side surface to the other side surface is formed in the middle of the piston body, a rack part is formed in the hole wall of the gear shaft moving hole, valve group mounting holes and one-way valve steel ball limiting holes are formed in two end surfaces of the piston body respectively, the valve group mounting holes and the one-way valve steel ball limiting holes are communicated with the gear shaft moving hole respectively, the one-way valve steel ball limiting holes are of a funnel-shaped structure, and the large opening end of the one-way valve steel ball limiting hole is located at the end part of the piston body; the gear of the gear shaft is arranged in the middle of the gear shaft; the safety valve group comprises a cylinder, two steel balls, a spring, a limiting nail, a filter screen and a copper powder sintering filter element, wherein two end surfaces of the cylinder are respectively provided with a large hole, the bottom of the two large holes are respectively provided with a small hole leading to the end surface of the opposite side, the diameter of each steel ball is smaller than that of the large hole and larger than that of the small hole, the two steel balls are respectively arranged in the large holes, the limiting nail is fixedly arranged in one of the large holes, the spring is also arranged in the large hole, one end of the spring is propped against the steel ball, the other end of the spring is propped against the limiting nail, so that the steel ball is always positioned at the joint of the large hole and the small hole, and the filter screen and the copper powder; the safety valve group is arranged in the valve group mounting hole of the piston body, the large hole end of a spring mounted in the safety valve group is arranged on the inner side of the valve group mounting hole, the check valve steel ball is arranged in the check valve steel ball limiting hole, the piston body is arranged in the piston cavity of the cylinder body, the two end covers are respectively covered at the two cavity openings of the piston cavity to form a sealing effect on the piston cavity, the large spring is also arranged in the piston cavity, one end of the large spring is abutted against one end of the piston body, which is provided with the check valve steel ball, the other end of the large spring is abutted against the inner side of one of the end covers, a sealing ring is further arranged between the end covers and the cylinder body, the middle part of the gear shaft is arranged in the mounting hole and is engaged with the rack part of the piston body, the two shaft covers are respectively arranged at the hole openings of the mounting hole to realize a complete, the three regulating valve groups are respectively arranged on an oil path of the cylinder body; the one end of swing arm is fixed at the tip of gear shaft, and the other end of swing arm is articulated mutually with the one end of connecting rod, the one end of screw rod is passed through the screw thread and is linked together with the other end looks spiro union of connecting rod, the one end of adaptor articulates on the fixed block, the other end of adaptor is articulated mutually with the other end of screw rod, the rotation center line of two articulated departments on the adaptor is the perpendicular setting in space.

Three, chinese utility model patent that the bulletin number of authorizing is CN206707493U, and the bulletin date of authorizing is 2017 12 months 5 discloses a hidden hydraulic pressure fire prevention door closer, include: a housing; a mounting plate disposed at one side of the housing; a rotating arm mounted on the mounting plate; further comprising: a first cavity which penetrates through the interior of the shell and is parallel to the central axis of the shell; sealing the end covers at two ends of the cavity through O-shaped rings; the gear shaft is positioned in the shell and connected with the rotating arm; the rack piston is arranged in the first cavity and sleeved outside the gear shaft; the one-way valve and the spring are respectively arranged on two sides of the rack piston; a second cavity arranged at one end of the one-way valve; the steel ball is arranged in the second cavity; the filter screen is arranged at the other end of the one-way valve and is tightly attached to the one-way valve; the variable-speed throttle valve is arranged on the shell and communicated with the cavity I; and the flame-retardant hydraulic oil is filled outside the spring.

Fourth, the Chinese utility model patent with the publication number of CN208010162U and publication date of 2018, 10 and 26 discloses a hidden fireproof door closer, which comprises a shell, a rotating arm and a buffer device, wherein the buffer device comprises a spring, a piston and a rotating shaft, the rotating shaft is connected with the rotating arm, the spring and the piston are both arranged in the shell, the rotating shaft is matched with the piston, the rotating shaft can rotate 0-170 degrees clockwise and anticlockwise relative to the piston, a first oil chamber and a second oil chamber are arranged in the shell, the first oil chamber and the second oil chamber are respectively positioned at two sides of the buffer device, the spring is positioned in the second oil chamber, one end of the spring is abutted to the piston, the piston is provided with a cavity, the first oil cavity and the second oil cavity are communicated through an oil way and the piston, the rotating shaft is provided with fan-shaped teeth, and the piston and the rotating shaft are provided with rotating teeth which are meshed with each other.

The spring pressure in the door closer of the above four patent documents is not adjustable at all times.

The applicant has also found a patent document, with publication No. CN101135219A, chinese patent application publication No. 3/5/2008, and discloses a door closer comprising a single, elongated housing which is closed at its end faces by locking screws provided with a circumferential groove outside the housing for connecting end caps, wherein a shield between the end caps butts the housing, which shield is fixed to a mounting plate, and a through-going cylindrical bore penetrates the housing, which bore is divided into a spring chamber, a crank chamber and a pressure-equalizing chamber, wherein an opening piston is in operative connection with a compression spring in the spring chamber, and a drive shaft which opens out of the housing on both sides in the crank chamber is provided with a transmission device which comprises a cam disk in force-locking and form-locking connection with the drive shaft, the cam disk has two cam running surfaces and is connected to a control arm on the drive shaft, which control arm is connected at its other end to a slide which is arranged displaceably in a slide rail.

In this document, reference is made to the concept of spring pressure regulation, see the description of the first paragraph in the description of the embodiments of this document and fig. 1 "the compression spring is supported on the left on an opening piston and on its right on a spring-supporting disk, which is a component of a spring force regulation device. The spring force adjustment device basically comprises a journal which has an external thread and is screwed into the spring support disk. In order to allow the spring force adjustment, the spring force adjustment device protrudes out of the housing. For this purpose, the spring force adjustment device projects into the locking screw. For adjustment, a recess for the extension of a corresponding wrench is provided in the extension of the spring force adjustment device. "

In this patent document, the journal is rotated, and the spring support disc is driven to move along the axial direction of the journal by the cooperation of the journal and the spring support disc, so as to apply an axial acting force to the spring, and the magnitude of the axial acting force is adjusted to adjust the magnitude of the pressure of the spring. However, as a result of careful study by the applicant, it has been found that this is highly unreliable in practical conditions. This is because in practice, when the journal is rotated, the spring-loaded disks often rotate with the journal without moving in the axial direction of the journal, so that no axial force can be applied to the spring and the magnitude of the spring pressure cannot be adjusted.

To sum up, how to design a locomotive door closer capable of adjusting spring pressure, make it adjust spring pressure according to operating condition to avoid taking place the unmatched problem between door closer and the locomotive door, guarantee that the locomotive door closes smoothly is the technical problem that the solution is urgently needed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a locomotive door closer capable of adjusting spring pressure, which can adjust the spring pressure according to the actual working condition, so that the problem of mismatching between the door closer and a locomotive door is avoided, and the smooth closing of the locomotive door is ensured.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a locomotive door closer, includes the cylinder body and sets up the spring in the cylinder body inner chamber, and it has pressure regulating rod to rotate to be connected with in the one end of cylinder body, and in pressure regulating rod's one end stretched into the cylinder body inner chamber, threaded connection had displacement nut on the pressure regulating rod outer peripheral face that lies in the cylinder body inner chamber, spring and displacement nut supported contact, still be provided with spring pressure in the locomotive door closer and adjust the structure, spring pressure adjust the structure including set up on displacement nut global circumference gag lever post and set up on the wall in the cylinder body inner chamber with circumference gag lever post complex spacing spout, the one end of circumference gag lever post insert to be connected fixedly with displacement nut on shifting nut global, the other one end of circumference gag lever post expose in displacement nut global and stretch into spacing spout in and be connected with spacing spout sliding fit.

Preferably, the outer peripheral surface of the displacement nut is provided with a screw hole, the circumferential limiting rod is a screw, the screw rod part of the screw is screwed into the screw hole, the head part of the screw extends into the limiting sliding groove, and the groove shape of the limiting sliding groove is matched with the head part of the screw.

Preferably, the circumferential limiting rod and the limiting sliding groove are respectively provided with two, a first screw hole and a second screw hole are respectively arranged on two opposite sides of the displacement nut, the central axes of the first screw hole and the second screw hole are overlapped, each screw comprises a first screw and a second screw, the first screw is installed in the first screw hole, and the second screw is installed in the second screw hole.

Preferably, the pressure regulating rod comprises a rod body and a flange arranged on the rod body, the rod body positioned at one side of the flange is the rod part of the pressure regulating rod, the rod body positioned at the other side of the flange is the head part of the pressure regulating rod, and the external thread is arranged on the rod part of the pressure regulating rod; the cylinder body is provided with a mounting through hole at one end part, and the head part of the pressure regulating rod is inserted into the mounting through hole to be connected in a rotating fit manner, so that the pressure regulating rod can be rotatably connected to one end of the cylinder body.

Preferably, a sealing ring is arranged at the inner end part of the cylinder body at the mounting through hole, a gasket is further arranged between the sealing ring and the flange of the pressure regulating rod, the displacement nut is in threaded connection with the rod part of the pressure regulating rod, the spring is supported and contacted with the displacement nut, so that an axial extrusion force is applied to the displacement nut by the spring force of the spring and is transmitted to the pressure regulating rod through the displacement nut, and finally the gasket and the sealing ring are sequentially pressed by the flange of the pressure regulating rod to form a sealing structure.

Preferably, the locomotive door closer further comprises a rack hook fastener arranged in the inner cavity of the cylinder body, one end of the rack hook fastener is provided with a piston body, the inner cavity of the cylinder body is divided into two cavities, namely a first cavity and a second cavity, through the piston body, the first cavity and the second cavity are also provided with a first flow channel and a second flow channel which are independent of each other, the first cavity and the second cavity are communicated with each other through the first flow channel, and the first cavity and the second cavity are also communicated with each other through the second flow channel; the piston body is also provided with a one-way valve which communicates the first cavity with the second cavity, so that hydraulic oil in the second cavity can enter the first cavity through the one-way valve; the spring is arranged between the other end of the rack hook fastener and the end wall of the inner cavity of the cylinder body, a cylindrical gear shaft is rotatably connected to the cylinder body, the central axis of the cylindrical gear shaft is perpendicular to the central axis of the cylinder body, the cylindrical gear shaft penetrates through the inner cavity of the cylinder body, one end of the cylindrical gear shaft is exposed out of the cylinder body, a rack is arranged on the rack hook fastener, and the rack is connected with a rack on the rack hook fastener in a meshed mode through the cylindrical gear shaft.

Preferably, the first inlet of the first flow channel and the second inlet of the second flow channel are both arranged in the first cavity, the position of the second inlet is arranged at the end part close to one end of the cylinder body, the position of the first inlet is arranged at the end part far away from one end of the cylinder body, and the first outlet of the first flow channel and the second outlet of the second flow channel are both arranged in the second cavity; when the rack hook shell starts to move, hydraulic oil in the cavity I can enter through the inlet I and the inlet II at the same time and flow into the cavity II through the outlet I and the outlet II;

when the piston body of the rack hook shell moves to be close to one end of the cylinder body, the first inlet is blocked by the piston body, and at the moment, hydraulic oil in the first cavity can only enter from the second inlet and flow into the second cavity through the second outlet.

The invention also discloses a processing and assembling method of the spring pressure adjusting structure, which is characterized in that an installation through hole is arranged at the end part of the closed end of the blind hole-shaped cylinder body, a limiting rod installation hole is arranged on the side part of the cylinder body, a blind hole is arranged on the end part of the closed end of the cylinder body and close to the installation through hole, the central axis of the blind hole and the central axis of the inner cavity of the cylinder body are not on the same straight line, so that a limiting sliding groove is formed on the wall of the inner cavity of the cylinder body after the blind hole is processed, and the limiting rod installation hole is communicated with the limiting;

then, assembling the displacement nut and the pressure regulating rod, and putting the assembled displacement nut and the pressure regulating rod into an inner cavity of the cylinder body from one end of the opening of the cylinder body together, so that the head of the pressure regulating rod is inserted into the mounting through hole of the cylinder body to be connected in a rotating fit manner;

after the displacement nut and the pressure regulating rod are installed, the circumferential limiting rod is inserted into the displacement nut from the limiting rod installation hole in the circumferential direction, so that one end of the circumferential limiting rod is connected with the displacement nut, the other end of the circumferential limiting rod is located in the limiting sliding groove and is in sliding connection with the limiting sliding groove in a matched mode, and machining and assembling of the spring pressure regulating structure are completed.

Preferably, the circumferential limiting rod is a screw, a screw hole is formed in the outer circumferential surface of the displacement nut, and after the displacement nut and the pressure regulating rod are installed, the screw is screwed into the circumferential direction of the displacement nut through the limiting rod installation hole.

Preferably, the screw comprises a first screw and a second screw, the limiting rod mounting hole and the limiting sliding groove are both provided with two screw holes, and the screw holes comprise a first screw hole and a second screw hole which are arranged on two opposite sides of the displacement nut;

after the displacement nut and the pressure regulating rod are installed, the screw hole I is aligned with one limiting rod installation hole, and the screw hole II is aligned with the other limiting rod installation hole; the first screw penetrates through the first limiting rod mounting hole and is screwed into the first screw hole, the second screw penetrates through the other limiting rod mounting hole and is screwed into the second screw hole, the screw rod portion of the first screw is screwed into the first screw hole, the head portion of the first screw is located in one limiting sliding groove and is in matched sliding connection, the screw rod portion of the second screw is screwed into the second screw hole, and the head portion of the second screw is located in the other limiting sliding groove and is in matched sliding connection.

The invention has the beneficial effects that: according to the invention, the spring pressure adjusting structure is designed in the locomotive door closer, so that the real-time adjustment of the spring pressure in the locomotive door closer is realized, and the spring pressure can be adjusted according to the actual working condition of the locomotive door during installation, thereby avoiding the problem of mismatching between the door closer and the locomotive door and ensuring the smooth closing of the locomotive door. Through the sealing structure design between the pressure regulating rod and the cylinder body, the hydraulic oil is prevented from leaking. The normal closing stroke and the buffering closing stroke are formed by arranging the two flow passages, so that the closing speed of the locomotive door is ensured, and the safety of operators is ensured. Through setting up the hydraulic oil flow size regulation structure that passes through in runner one and the runner two, the size of the normal stroke of closing of locomotive door in the control locomotive door and the size of the stroke of closing of control buffering locomotive door closing speed have further increased the practicality of this embodiment. By designing the processing and assembling method of the spring pressure adjusting structure, the spring pressure adjusting structure in the locomotive door closer is convenient to process and assemble, and therefore the processing and assembling efficiency of the whole product is improved.

Drawings

FIG. 1 is an axial cross-sectional structural schematic view of a locomotive door closer in an embodiment of the invention;

FIG. 2 is a schematic view of the operation principle of the door closer of the locomotive according to the embodiment of the invention when the door of the locomotive is opened and closed;

FIG. 3 is an enlarged view of portion A of FIG. 1;

FIG. 4 is a schematic front view of a displacement nut with a screw according to an embodiment of the present invention;

FIG. 5 is a schematic front view of the pressure adjusting lever according to the embodiment of the present invention;

FIG. 6 is a first schematic diagram illustrating the operation of a locomotive door closer according to an embodiment of the present invention when the locomotive door is closed and the locomotive door is in a buffering closing stroke;

FIG. 7 is a schematic view of a second principle of operation of the locomotive door closer according to the embodiment of the present invention when the locomotive door is closed and the locomotive door is in a buffering closing stroke;

FIG. 8 is a schematic structural diagram illustrating a principle of adjusting the hydraulic oil flow rate of the first flow passage according to the embodiment of the present invention;

FIG. 9 is a schematic perspective view of a rack hook in an embodiment of the present invention;

FIG. 10 is a schematic diagram of the spring pressure adjustment mechanism of the embodiment of the present invention during assembly;

in the figure: 1. the cylinder body, 111, a first cavity, 112, a second cavity, 2, a rack hook, 211, a piston body, 212, a cylinder body, 213, a cylinder inner cavity, 214, a cylinder through hole, 215, a boss, 216, a rack, 3, a first flow passage, 311, a first inlet, 312, a first outlet, 313, a first flow passage front section, 314, a first flow passage rear section, 4, a second flow passage, 411, a second inlet, 412, a second outlet, 5, a check valve, 6, a spring, 7, a cylindrical gear shaft, 8, a pressure regulating rod, 811, a rod body, 812, a flange, 813, a head, 814, a counter bore, 9, a displacement nut, 911, a first screw hole, 912, a second screw hole, 10, a circumferential limiting rod, 11, a limiting sliding groove, 12, a first screw, 13, a second screw, 14, a sealing ring, 15, a gasket, 16, a first variable speed throttle valve, 161, a, 17. the safety valve comprises a safety valve body, 18 mounting through holes, 19 limiting rod mounting holes I and 20 limiting rod mounting holes II, 21 blind holes I and 22 blind holes II, 23 welding joints, 24 end covers and 25 end plug screw rods.

Detailed Description

The technical solution of the present invention is further explained in detail with reference to the accompanying drawings and specific embodiments.