CN212317729U - Locomotive door closer capable of adjusting spring pressure - Google Patents

Abstract

The utility model discloses a can carry out spring pressure adjustment's locomotive door closer, including cylinder body and the spring of setting in the cylinder body inner chamber, rotate in one end of cylinder body and be connected with the pressure regulating pole, during the one end of pressure regulating pole stretches into the cylinder body inner chamber, threaded connection has displacement nut on the pressure regulating pole 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. The utility model discloses can adjust spring pressure size according to operating condition, guarantee that the locomotive door closes smoothly.

Description

Locomotive door closer capable of adjusting spring pressure

Technical Field

The utility model relates to a locomotive door closer especially relates to a can carry out spring pressure regulation's locomotive door closer.

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, 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 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, published as chinese invention patent No. 3/5/2008, and discloses a door closer comprising a single, elongated housing which is closed at its ends by locking screws provided with a circumferential groove outside the housing for connecting end caps, wherein the housing is topped between the end caps by a shield which is fixed to a mounting plate and which penetrates the housing by a through-going cylindrical bore which 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 disc in force-locking and form-locking connection with the drive shaft, which has two cam running faces, and an actuating arm is connected to the drive shaft, which actuating arm is connected at its other end to a slide which is movably arranged 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 that can carry out spring pressure and adjust, make it can adjust spring pressure size 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 badly needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that to the defect that exists among the prior art, provide a can carry out spring pressure regulation's locomotive door closer, it can adjust spring pressure size according to operating condition to avoid taking place unmatched problem between door closer and the locomotive door, guaranteed closing smoothly of locomotive door.

In order to solve the technical problem, the utility model discloses the technical scheme who takes does: 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 beneficial effects of the utility model reside in that: the utility model discloses a design spring pressure and adjust the structure in locomotive door closer, realized the real-time regulation of spring pressure in the locomotive door closer, feasible the utility model discloses can adjust the spring pressure size according to the operating condition of locomotive door when the installation to avoid taking place unmatched problem between door closer and the locomotive door, guaranteed the smooth closing of 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.

Drawings

Fig. 1 is an axial sectional structural schematic view of a locomotive door closer according to an embodiment of the present invention;

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

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

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

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

fig. 6 is a schematic view showing a working principle 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 the buffering closing stroke;

FIG. 7 is a schematic view illustrating a second working principle 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 the buffering closing stroke;

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

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

fig. 10 is a schematic view of the spring pressure adjusting structure according to 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 will be further elaborated with reference to the accompanying drawings and specific embodiments.

Example (b): the applicant first sets forth the basic structure and the basic principle of the entire door closer in the following embodiment. As shown in fig. 1 and 2, a door closer for a locomotive comprises a cylinder body 1 and a rack hook 2 arranged in an inner cavity of the cylinder body, wherein the rack hook 2 is similar to a piston and can move back and forth in the inner cavity of the cylinder body along the axial direction of the cylinder body 1, and hydraulic oil is filled in the inner cavity of the cylinder body. One end of the rack hook shell 2 is provided with a piston body 211, the inner cavity of the cylinder body is divided into two cavities, namely a first cavity 111 and a second cavity 112 through the piston body 211, the first cavity 111 and the second cavity 112 are respectively positioned at two sides of the piston body 211, a first flow channel 3 and a second flow channel 4 which are independent of each other are further arranged in the cylinder body 1, the first cavity 111 and the second cavity 112 are communicated with each other through the first flow channel 3, and the first cavity 111 and the second cavity 112 are also communicated with each other through the second flow channel 4. The piston body 211 is further provided with a check valve 5, the check valve 5 communicates the first cavity 111 with the second cavity 112, so that hydraulic oil in the second cavity 112 can enter the first cavity 111 through the check valve 5, and hydraulic oil in the first cavity 111 cannot enter the second cavity 112 through the check valve 5. A spring 6 is also arranged between the other end of the rack hook shell 2 and the end wall of the inner cavity of the cylinder body, and the spring 6 is a pressure spring. The cylinder body 1 is rotatably connected with a cylindrical gear shaft 7, the central axis of the cylindrical gear shaft 7 is perpendicular to the central axis of the cylinder body 1, the cylindrical gear shaft 7 penetrates through the inner cavity of the cylinder body, one end of the cylindrical gear shaft 7 is exposed out of the cylinder body 1, one end of the cylindrical gear shaft 7 exposed out of the cylinder body 1 is connected with a rotating arm (not shown in the figure), and the rotating arm is connected to a locomotive door. The rack hook shell 2 is provided with a rack which is meshed and connected with the rack on the rack hook shell 2 through a cylindrical gear shaft 7.

The basic working principle of the locomotive door closer is as follows:

when the door is opened, the locomotive door is pushed to rotate to drive the rotating arm to rotate, then the rotating arm drives the cylindrical gear shaft 7 to rotate, the cylindrical gear shaft 7 is matched with the rack on the rack hook shell 2, so that the rack hook shell 2 is driven to move (move towards the right side in fig. 2) to compress the spring 6, elastic potential energy is stored, meanwhile, the piston body 211 of the rack hook shell 2 presses hydraulic oil in the cavity II 112 into the cavity I111 through the check valve 5, at the moment, a low-pressure cavity is formed in the cavity II 112, a high-pressure cavity is formed in the cavity I111, and the spring 6 is in a compressed state.

When the locomotive door is closed, the locomotive door is loosened, the rack hook shell 2 is pushed to move reversely (towards the left side in the figure 2) under the action of the restoring force of the spring 6, the check valve 5 is in a closed state at the moment, the piston body 211 of the rack hook shell 2 can only enable hydraulic oil in the cavity I111 to flow back to the cavity II 112 again through the flow passage I3 and the flow passage II 4, and in the process of reverse movement of the rack hook shell 2, the cylindrical gear shaft 7 is matched with the rack on the rack hook shell 2 to enable the cylindrical gear shaft 7 to rotate reversely, so that the rotating arm is driven to rotate reversely, and finally the locomotive door is automatically closed.

As shown in fig. 1 and fig. 3, in order to adjust the spring pressure in the locomotive door closer at any time, in this embodiment, a pressure adjusting rod 8 is rotatably connected to one end of a cylinder body 1, the axial direction of the pressure adjusting rod 8 is arranged along the axial direction of the cylinder body 1, one end of the pressure adjusting rod 8 extends into an inner cavity of the cylinder body, an external thread is arranged on the outer circumferential surface of the pressure adjusting rod 8 located in the inner cavity of the cylinder body, a displacement nut 9 is further sleeved in the inner cavity of the cylinder body and located on the pressure adjusting rod 8, the displacement nut 9 is connected with the external thread on the pressure adjusting rod 8 in a matching manner, a spring 6 is arranged between a rack hook 2 and the displacement nut 9, namely, one end of the spring 6 is in supporting contact with the rack hook 2, the other end of the spring 6 is in supporting contact with the displacement nut 9, a circumferential limiting rod 10 is arranged on the circumferential surface of the displacement nut 9, a, the limiting sliding groove 11 is arranged on the wall of the inner cavity of the rod body along the axial direction of the cylinder body 1 and is an open groove. One end of the circumferential limiting rod 10 is inserted into the circumferential surface of the displacement nut 9 and is fixedly connected with the displacement nut 9, and the other end of the circumferential limiting rod 10 is exposed out of the circumferential surface of the displacement nut 9 and extends into the limiting sliding groove 11 to be connected with the limiting sliding groove 11 in a sliding fit manner.

When the size of spring pressure needs to be adjusted, rotation pressure regulating rod 8, when pressure regulating rod 8 rotates, because the other one end of circumference gag lever post 10 stretches into in spacing spout 11, make spacing spout 11 and circumference gag lever post 10 cooperate the circumferential direction of restriction displacement nut 9, simultaneously under the cooperation of the external screw thread of displacement nut 9 and pressure regulating rod 8, make displacement nut 9 along pressure regulating rod 8's axial displacement, thereby adjust the effort size of exerting on the spring, and then the size of adjusting spring pressure. When the displacement nut 9 moves in the axial direction of the pressure-regulating rod 8, the other end of the circumferential limiting rod 10 extending into the limiting chute 11 also moves along the limiting chute 11. This embodiment is through designing spring pressure regulation structure in locomotive door closer, has realized the real-time regulation of spring pressure in the locomotive door closer for this embodiment can adjust spring pressure size according to the operating condition of locomotive door when the installation, thereby has avoided taking place the unmatched problem between door closer and the locomotive door, has guaranteed closing smoothly of locomotive door.

As shown in fig. 3 and 4, in the present embodiment, a screw hole is formed on the outer peripheral surface of the displacement nut 9, a screw, preferably a slotted pan head screw, is used as the circumferential limiting rod 10, a screw shaft portion of the screw is screwed into the screw hole, a head portion of the screw extends into the limiting sliding groove 11, and a groove shape of the limiting sliding groove 11 is matched with the head portion of the screw so as to facilitate the matching sliding therebetween. The two circumferential limiting rods 10 and the two limiting sliding grooves 11 are arranged in the embodiment, the two opposite sides of the displacement nut 9 are respectively provided with a first screw hole 911 and a second screw hole 912, the central axes of the first screw hole 911 and the second screw hole 912 are overlapped, each screw comprises a first screw 12 and a second screw 13, the first screw 12 is installed in the first screw hole 911, and the second screw 13 is installed in the second screw hole 912. This arrangement facilitates further limiting circumferential rotation of the displacement nut.

As shown in fig. 3 and 5, the pressure-adjusting lever 8 includes a lever body 811 and a flange 812 provided on the lever body 811, the lever body 811 at one side of the flange 812 being a lever portion of the pressure-adjusting lever 8, the lever body 811 at the other side of the flange 812 being a head portion of the pressure-adjusting lever 8, and external threads being provided on the lever portion of the pressure-adjusting lever 8. A mounting through hole is formed at one end of the cylinder block 1, and the head 813 of the pressure regulating rod 8 is inserted into the mounting through hole to be coupled with a rotary fit, so that the pressure regulating rod 8 can be rotatably coupled to one end of the cylinder block 1. Since here the pressure regulating lever 8 can be pivotally connected to one end of the cylinder 1. Since this is a rotary connection, in order to prevent hydraulic oil inside the cylinder from leaking from this, this embodiment has designed a sealing structure here. A sealing ring 14 is arranged on the inner end part of the cylinder body 1 at the mounting through hole, a gasket 15 is arranged between the sealing ring 14 and a flange 812 of the pressure regulating rod 8, a displacement nut 9 is in threaded connection with the rod part of the pressure regulating rod 8, one end of a spring 6 is in supporting contact with a rack hook 2, the other end of the spring 6 is in supporting contact with the displacement nut 9, so that an axial extrusion force is applied to the displacement nut 9 by the spring force of the spring 6 and is transmitted to the pressure regulating rod 8 through the displacement nut 9, and finally the gasket 15 and the sealing ring 14 are sequentially pressed by the flange 812 of the pressure regulating rod 8 to form a sealing structure, so that the hydraulic oil at the position is prevented from leaking. In addition, it should be noted that the rotation of the pressure regulating rod 8 does not need to be rotated frequently, when the vehicle door is installed, only the pressure regulating rod needs to be rotated to adjust the pressure of the spring according to the type of the vehicle door to be installed, and then the pressure regulating rod does not need to be rotated again, so that the sealing structure designed in the embodiment can ensure that the hydraulic oil in the position cannot be leaked. The end of the head 813 of the pressure regulating rod 8 is also provided with a counter bore 814 for facilitating the rotation of the pressure regulating rod.

In the embodiment, during the normal closing process of the locomotive door, two strokes are designed, including a normal closing stroke when the locomotive door just starts to close and a buffer closing stroke when the locomotive door is closed quickly, and the closing speed of the normal closing stroke is greater than that of the buffer closing stroke, because when the locomotive door is closed quickly, the locomotive door is close to the door frame, and if the speed is too high, danger is easily caused. In this embodiment, the two strokes are designed by designing the positional relationship between the first flow channel and the second flow channel. As shown in fig. 2, 6 and 7 (fig. 2 is a normal closing stroke, fig. 6 and 7 are buffer closing strokes), when the locomotive door is closed, the rack hook shellfish 2 moves towards one end of the cylinder (as shown by an arrow in the figure), the inlet first 311 of the flow passage one 3 and the inlet second 411 of the flow passage two 4 are both arranged in the cavity first 111, the position of the inlet second 411 is arranged close to one end of the cylinder, the position of the inlet first 311 is arranged far from one end of the cylinder, and the outlet first 312 of the flow passage one 3 and the outlet second 412 of the flow passage two 4 are both arranged in the cavity second 112. When the rack hook 2 starts to move, since the first inlet 311 and the second inlet 411 are not blocked at the moment, the hydraulic oil in the first cavity 111 can enter through the first inlet 311 and the second inlet 411 at the same time and flow into the second cavity 112 through the first outlet 312 and the second outlet 412.

When the piston body 211 of the rack hook shell 2 moves to a position close to one end of the cylinder body, the first inlet 311 is blocked by the piston body 211 (as shown in fig. 6), at this time, since the first inlet 311 is blocked, hydraulic oil in the first cavity can only enter from the second inlet 411, so that the moving speed of the piston body 211 is slowed, the locomotive door enters a buffering closing stroke, when the piston body 211 moves to one end of the cylinder body (as shown in fig. 7), all hydraulic oil in the first cavity is discharged into the second cavity through the second inlet 411 and the second outlet 412, and at this time, the locomotive door is in a closed state. It should be noted that, although the piston body 211 is in the moving state during the buffering closing stroke, the first inlet 311 is always blocked during the moving process, so that it is ensured that the hydraulic oil in the first cavity can only be discharged into the second cavity through the second flow passage 4 during the buffering closing stroke. 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.

Here, in order to adjust the flow rate of the hydraulic oil passing through the first flow passage and the second flow passage, the present embodiment is further improved. As shown in fig. 8, taking the first flow channel 3 as an example for explanation, a first variable-speed throttle valve 16 is further provided at one end of the cylinder 1, a valve core of the first variable-speed throttle valve 16 is inserted into the first flow channel 3 to divide the first flow channel 3 into two sections, namely a first front flow channel section 313 and a second flow channel section 314, an inlet one 311 is provided at the first front flow channel section 313, and an outlet one 312 is provided at the second rear flow channel section 314. The hydraulic oil sequentially enters the second cavity through the first inlet 311, the first flow passage front section 313, the first speed-changing throttle valve spool, the first flow passage rear section 314 and the first outlet 312, and the flow of the hydraulic oil passing through the first flow passage is adjusted by controlling the opening of the first speed-changing throttle valve spool. In this embodiment, a first speed regulation flow channel 161 is arranged on a valve core of a first speed regulation throttle valve, one end port of the first speed regulation flow channel 161 is communicated with a first flow channel front section 313, the other end port of the first speed regulation flow channel 161 is communicated with a first flow channel rear section 314, a first speed regulation throttle valve 16 is rotatably connected to one end part of the cylinder 1, and by rotating the valve core of the first speed regulation throttle valve 16, the size of the overlapping area S1 between one end port of the first speed regulation flow channel 161 and the first flow channel front section 313 and the size of the overlapping area S2 between the other end port of the first speed regulation flow channel 161 and the first flow channel rear section 314 are adjusted, so that the size of the passing hydraulic oil flow.

The principle and structure of adjusting the flow rate of the hydraulic oil passing through the second flow passage are the same as those of the first flow passage, namely, a second variable-speed throttle valve is further arranged at one end of the cylinder body 1, a valve core of the second variable-speed throttle valve is inserted into the second flow passage to divide the second flow passage into two sections, namely a front section of the second flow passage and a rear section of the second flow passage, an inlet II is arranged on the front section of the second flow passage, and an outlet II is arranged on the rear section of the second flow passage. And hydraulic oil sequentially enters the second cavity through the second inlet, the front section of the second flow passage, the valve core of the second variable-speed throttle valve, the rear section of the second flow passage and the second outlet, and the flow of the hydraulic oil passing through the first flow passage is adjusted by controlling the opening of the valve core of the second variable-speed throttle valve. In this embodiment, a second speed regulation flow channel is arranged on a valve core of the second speed regulation flow channel, one end port of the second speed regulation flow channel is communicated with the front section of the second flow channel, the other end port of the second speed regulation flow channel is communicated with the rear section of the second flow channel, and the second speed regulation flow channel is rotatably connected to one end part of the cylinder body 1. 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.

As shown in fig. 9, the rack hook 2 is cylindrical and includes a cylindrical body 212, a piston body 211 is disposed on one end of the cylindrical body 212, a check valve 5 is disposed on the piston body 211, the cylindrical body 212 is hollow and has a through shape to form a cylindrical inner cavity 213, the check valve 5 is communicated with the cylindrical inner cavity 213, and a safety valve 17 is further disposed on the check valve 5. A cylinder through hole 214 is further provided at the other end of the cylinder body 212, and the cylinder through hole 214 is also communicated with the cylinder inner chamber 213. The diameter of the piston body 211 is matched with the diameter of the inner cavity of the cylinder body, so that the inner cavity of the cylinder body is divided into a first cavity and a second cavity, and the diameter of the other end of the cylindrical body 212 can be smaller than the diameter of the inner cavity of the cylinder body. A boss 215 is further disposed on the outer end of the other end of the cylindrical body 212, so that one end of the spring is sleeved on the boss 215. The rack 216 is arranged on the inner wall of the cylindrical inner cavity 213 and is meshed with the cylindrical gear shaft 7.

Because the locomotive door closer in the embodiment is improved in the aspect of spring pressure adjustment, the machining and assembling method of the spring pressure adjustment structure is different from that of other door closers, and therefore, the embodiment also discloses the machining and assembling method of the spring pressure adjustment structure. As shown in fig. 10, in this embodiment, the cylinder body 1 is blind-hole-shaped, that is, one end of the cylinder body 1 is in a closed state, the other end of the cylinder body 1 is open-ended, a mounting through hole 18 is opened on the end of the closed end of the cylinder body 1, a first stop lever mounting hole 19 and a second stop lever mounting hole 20 are opened on the side of the cylinder body 1, a first blind hole 21 and a second blind hole 22 are opened on the end of the closed end of the cylinder body 1 near the mounting through hole 18, wherein the central axis of the first blind hole 21 and the central axis of the inner cavity of the cylinder body 1 are not on the same straight line, the central axis of the second blind hole 22 and the central axis of the inner cavity of the cylinder body 1 are not on the same straight line, so that two open-ended stop chutes 11 are formed on the wall of the inner cavity of the cylinder body 1 after the first blind hole 21 and the second blind hole 22 are processed, the radial cross section of the stop chutes 11 is semicircular, the, and after the first blind hole 21 and the second blind hole 22 are processed, one end of the first blind hole 21 and one end of the second blind hole 22 are blocked by a welding seam 23. Then with displacement nut 9 threaded connection on pressure regulating pole 8, lay sealing washer 14 and packing ring 15 well again, put into 1 inner chamber of cylinder body from 1 opening one end of cylinder body with displacement nut 9 and pressure regulating pole 8 together for the head of pressure regulating pole 8 inserts and rotates the fit connection in the installation through-hole of cylinder body 1, then put into 1 inner chamber of cylinder body from 1 opening one end of cylinder body with spring 6 and rack hook shellfish 2, reuse end cover 24 seals 1 opening form tip of cylinder body, utilize pressure regulating pole 8 to compress tightly sealing washer 14 and packing ring 15 on 1 inner wall of cylinder body, then install cylindrical gear axle 7, make it and rack hook shellfish 2 cooperate and be connected well. After the displacement nut 9 and the pressure regulating rod 8 are installed, two screw holes in the circumferential direction of the displacement nut 9 are respectively aligned with the first limiting rod installation hole 19 and the second limiting rod installation hole 20, two circumferential limiting rods 10 are screwed into the two screw holes in the circumferential direction of the displacement nut 9 from the first limiting rod installation hole 19 and the second limiting rod installation hole 20 respectively, the first limiting rod installation hole 19 and the second limiting rod installation hole 20 are blocked by the aid of the two plug screw rods 25, and machining and assembling of the spring pressure regulating structure are completed. Through such machining and assembling steps, the machining and assembling of the spring pressure adjusting structure in the present embodiment are achieved.

To sum up, the utility model discloses a design spring pressure and adjust the structure in locomotive door closer, realized the real-time regulation of spring pressure in the locomotive door closer, make the utility model discloses can adjust the spring pressure size according to the operating condition of locomotive door when the installation to avoid taking place unmatched problem between door closer and the locomotive door, guaranteed the smooth closing of 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. Through the processing equipment method of designing spring pressure adjustment structure, make the utility model discloses spring pressure adjustment structure in the well locomotive door closer is convenient for process the equipment to the processing packaging efficiency of whole product has been improved.

The term "plurality" as used in the above embodiments means a number of "two or more". The above embodiments are provided only for the purpose of illustration, not for the limitation of the present invention, and those skilled in the relevant art can make various changes or modifications without departing from the spirit and scope of the present invention, so all equivalent technical solutions should also belong to the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims (7)

1. The utility model provides a can carry out spring pressure regulation's locomotive door closer, includes cylinder body and the spring of setting 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 capable of spring pressure adjustment 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 capable of spring pressure adjustment 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 capable of spring pressure adjustment 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 capable of spring pressure adjustment 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 capable of spring pressure adjustment according to 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 capable of spring pressure adjustment 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.

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