Cam rack double-structure door closer

Abstract

The utility model relates to a cam rack double structure door closer which comprises a shell, a rotating shaft, a piston and a pressing block, the piston and the pressing block longitudinally slide in the shell, a sliding receding groove is formed in the piston, racks are formed on the two sides of the sliding receding groove, the rotating shaft is transversely connected to the shell and arranged in the sliding receding groove in a penetrating mode, and the pressing block is arranged on the rotating shaft. The rotating shaft is fixedly connected with follow-up teeth and a cam set, the teeth are meshed with the rack, the pressing block is movably locked at one end of the piston and rotationally connected with a roller, and an energy storage elastic assembly is arranged between the pressing block and the end of the shell. The rack and the roller are respectively driven by the teeth and the cam group, so that the piston and the pressing block simultaneously move back and forth; the door closer is combined with a cam rack double structure, so that the non-uniformity of a traditional door closer in the closing speed is effectively reduced, the wind pressure resistance is enhanced, meanwhile, compared with a traditional design, the torque during door opening and door closing is greatly optimized, and more stable and safer use experience is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of door closer, concretely is cam rack double structure door closer. BACKGROUND

[0002] The door closer is a hydraulic device similar to a spring on the door head, which can automatically close the door after being opened by compression and release, has the function of a spring door, and can ensure that the door is accurately and timely closed to the initial position.

[0003] During the spring release process of the door closer, the hydraulic oil in the door closer flows back and forth in the oil passage and the gap, thereby forming resistance to the spring release of the hydraulic oil, that is, the throttling achieves the effect of buffering, and the closing speed of the door is controlled.

[0004] The current common door closer can only be applied to small doors, the torque during door opening and closing is low, and the closing speed is uneven, the wind pressure resistance is weak, and the door opening is not stable, so the door closer needs to be further improved. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the above-mentioned problems, and provides a cam rack double structure door closer with simple and reasonable structure, which realizes strong closing force and stable closing speed.

[0006] The cam rack double structure door closer comprises a shell, a rotating shaft, a piston and a pressing block, the piston and the pressing block slide longitudinally in the shell, a sliding avoidance groove is formed in the piston, two sides of the sliding avoidance groove form racks, the rotating shaft is transversely connected to the shell and penetrates the sliding avoidance groove, the rotating shaft is fixedly connected to a follower gear and a cam set in the shell, the gear is engaged with one of the racks, the pressing block is movably locked at one end of the piston, one end of the pressing block is rotatably connected to a roller abutting against the edge of the cam set, an energy storage elastic assembly is arranged between the other end of the pressing block and the end of the shell, and when the rotating shaft rotates, the gear and the cam set drive the rack and the roller respectively to make the piston and the pressing block move forward and backward simultaneously.

[0007] The utility model can also solve the problems by using the following technical measures:

[0008] As a more specific scheme, the piston is partitioned into a first oil cavity and a second oil cavity in the shell, an oil passage is formed in the shell to communicate the first oil cavity and the second oil cavity, the shell is filled with hydraulic oil reciprocally transferred between the first oil cavity and the second oil cavity, a rotating shaft oil cavity is formed between the front and rear ends of the piston, an oil passage is formed in the piston to communicate the rotating shaft oil cavity and the first oil cavity, and a piston safety valve is arranged in the oil passage.

[0009] As a further scheme, the oil flow channel is sequentially provided with a first inlet and outlet oil hole communicating with the first oil cavity, a second inlet and outlet oil hole, a third inlet and outlet oil hole communicating with the rotating shaft oil cavity, a fourth inlet and outlet oil hole and a fifth inlet and outlet oil hole communicating with the second oil cavity, a one-door closing speed adjusting valve is mounted in the first inlet and outlet oil hole, a two-door closing speed adjusting valve is mounted in the third inlet and outlet oil hole, and an opening-door buffer adjusting valve is mounted in the fifth inlet and outlet oil hole.

[0010] As a further scheme, a force adjusting nut is further axially slidably arranged in the shell, the force adjusting nut is abutted between an end of the energy storage elastic assembly opposite to the pressing block and an end of the shell, and a door closing force adjusting assembly driving the force adjusting nut to move forward and backward is arranged on the shell.

[0011] As a further scheme, the cam set comprises two cam peaches which are fixedly connected on the rotating shaft in an up-down manner, the teeth are fan-shaped teeth and are fixedly connected between the two cam peaches, the tip part of each cam peach is extended in a direction corresponding to the fan-shaped teeth, and a positioning groove for clamping the roller is arranged on the base circle part of each cam peach at a position opposite to the tip part.

[0012] As a further scheme, the piston is provided with a shaft hole communicating with the sliding avoiding groove at one end close to the energy storage elastic assembly; the pressing block comprises a sliding shaft sleeve linearly slidably arranged with the shaft hole, a limiting through groove is throughly arranged on the sliding shaft sleeve, a limiting rod is arranged in the shaft hole along the diameter of the shaft hole and slidably arranged with the limiting through groove, a pressing ring is arranged at one end of the sliding shaft sleeve, one end of the energy storage elastic assembly is abutted on the pressing ring, a roller shaft is connected to the other end of the sliding shaft sleeve, and one roller is connected to each of the upper and lower ends of the roller shaft.

[0013] As a further scheme, the energy storage elastic assembly comprises a large spring and a small spring, the small spring is axially arranged inside the large spring, one end of the large spring and the small spring is abutted on the end of the shell, the other end of the large spring is abutted on the pressing ring, and the other end of the small spring is embedded in the sliding shaft sleeve and abutted on the limiting rod.

[0014] As a further scheme, the door closing force adjusting assembly comprises a force adjusting screw rotatably connected to the end of the shell, a screw thread segment is arranged at the inner end of the force adjusting screw, the screw thread segment is linearly slidably arranged with the force adjusting nut, the outer end of the force adjusting screw is extended out of the end cover and connected to a driven force adjusting bevel gear, an adjusting nut is arranged on the shell, and a driving force adjusting bevel gear meshing with the driven force adjusting bevel gear is connected to the adjusting nut.

[0015] As a further scheme, the piston safety valve comprises a valve seat, an upper passage and a lower passage communicating with the oil passage are arranged in the valve seat, a filter screen is arranged between the upper passage, the lower passage and the oil passage, a one-way valve for closing the door is arranged in the upper passage, and a one-way valve for opening the door is arranged in the lower passage.

[0016] As a further scheme, one side of the force adjusting nut is provided with a limiting groove along the movement direction thereof, a mounting through hole corresponding to the limiting groove is provided on the shell, and a nut fixing screw which is locked and matched with the limiting groove is fastened and connected in the mounting through hole.

[0017] The utility model discloses the beneficial effect is as follows:

[0018] The utility model discloses a cam rack double structure door closer, this closing ware combines cam rack double structure, provides powerful closing force and stable closing speed, and the powerful force set before door closing ensures that even hidden door closer can be stably closed, especially suitable for major fan door.

[0019] Its unique double cam structure effectively reduces the unevenness of traditional door closer in closing speed, enhances the wind pressure resistance, and greatly optimizes the torque when opening and closing compared with traditional design, ensuring more stable and safe use experience.

[0020] Compared with the traditional door closer, it provides the ability to easily open and close a large door weighing up to 180kg, the closing torque of the double cam rack is increased by 36%, and the opening torque is reduced by 60%.

[0021] In addition, the structure realizes smooth and consistent closing speed through rich hydraulic oil flow, not only has excellent wind pressure resistance, but also helps to reduce the discomfort when opening and closing. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is cross section structure schematic diagram of one embodiment in the utility model.

[0023] Figure 2 It is cross section structure schematic diagram of oil flow passage in the utility model.

[0024] Figure 3 It is cam rack double structure schematic diagram in the utility model.

[0025] Figure 4 It is cam rack double structure exploded schematic diagram in the utility model.

[0026] Figure 5 It is door closer door closing state structure schematic diagram in the utility model.

[0027] Figure 6 It is door closer door opening state structure schematic diagram in the utility model.

[0028] Figure 7 It is piston safety valve structure schematic diagram in the utility model.

[0029] Figure 8 It is door closer exploded structure schematic diagram in the utility model. DETAILED DESCRIPTION

[0030] The utility model is further illustrated below in combination with the drawings and examples.

[0031] Reference Figures 1 to 8 As shown in the figure, the cam rack double-structure door closer comprises a shell 1, a rotating shaft 2, a piston 3 and a pressing block 4, the piston 3 and the pressing block 4 slide longitudinally in the shell 1, a sliding avoidance groove 31 is formed on the piston 3, two sides of the sliding avoidance groove 31 form a rack 8, the rotating shaft 2 is transversely connected to the shell 1 and passes through the sliding avoidance groove 31, the rotating shaft 2 is fixedly connected with a following tooth 6 and a cam set 7 in the shell 1, the tooth 6 is engaged with one of the racks 8, the pressing block 4 is movably locked at one end of the piston 3, one end of the pressing block 4 is rotatably connected with a roller 9 which is in close contact with the edge of the cam set 7, an energy storage elastic component 5 is arranged between the other end of the pressing block 4 and the end of the shell 1, when the rotating shaft 2 rotates, the tooth 6 and the cam set 7 drive the rack 8 and the roller 9 respectively, so that the piston 3 and the pressing block 4 move forward and backward at the same time.

[0032] This closer combines the cam rack double structure, provides strong closing force and stable closing speed, the strong force set before closing the door ensures that even the hidden door closer can be closed stably, the unique double-cam structure effectively reduces the unevenness of the traditional door closer in the closing speed, enhances the wind pressure resistance, and the torque when opening and closing the door is greatly optimized compared with the traditional design, ensuring a more stable and safe use experience.

[0033] The piston 3 is separated by a first oil cavity 101 and a second oil cavity 102 in the shell 1, the energy storage elastic component is arranged in the second oil cavity 102, an oil passing flow channel 103 which communicates the first oil cavity 101 and the second oil cavity 102 is formed in the shell 1, the shell 1 is filled with hydraulic oil which reciprocally transfers between the first oil cavity 101 and the second oil cavity 102; a rotating shaft oil cavity 302 is formed between the front and rear ends of the piston 3, an oil passing channel 301 which communicates the rotating shaft oil cavity 302 and the first oil cavity 101 is formed on the piston 3, a piston safety valve 13 is arranged in the oil passing channel 301;

[0034] The structure realizes smooth and consistent closing speed through abundant hydraulic oil flow, not only has excellent wind pressure resistance, but also helps to reduce the discomfort when opening and closing the door.

[0035] And, the oil flow channel 103 is sequentially provided with a first inlet and outlet oil hole 105 communicating with the first oil chamber 101, a second inlet and outlet oil hole 106, a third inlet and outlet oil hole 107 communicating with the rotating shaft oil chamber 302, and a fourth inlet and outlet oil hole 108 and a fifth inlet and outlet oil hole 109 communicating with the second oil chamber 102, and a one-stage door closing speed adjusting valve 14 is mounted in the first inlet and outlet oil hole 105, a two-stage door closing speed adjusting valve 15 is mounted in the third inlet and outlet oil hole 107, and an opening door buffer adjusting valve 16 is mounted in the fifth inlet and outlet oil hole 109.

[0036] The piston safety valve 13 is responsible for not allowing hydraulic oil to backflow when the door is closed, allowing the hydraulic oil to backflow to the rotating shaft oil chamber 302 through the one-stage door closing speed adjusting valve 14, and absorbing impact force when violent closing occurs.

[0037] The housing 1 is further provided with a force adjusting nut 10 which axially slides, the force adjusting nut 10 abuts between the end of the energy storage elastic assembly 5 away from the pressing block 4 and the end of the housing 1, and the housing 1 is provided with a door closing force adjusting assembly 11 for driving the force adjusting nut 10 to move forward and backward, by driving the force adjusting nut 10 to move longitudinally forward and backward in the inner cavity of the housing 1, the tension of the energy storage elastic assembly 5 is compressed, thereby adjusting the damping force of the door closer when opening and closing the door.

[0038] The cam set 7 includes two cam peaches 71 which are fixedly connected on the rotating shaft 2 in an up-down manner, the teeth 6 are fan-shaped teeth and are fixedly connected between the two cam peaches 71, the tip position 711 of each cam peach 71 is provided in extension corresponding to the direction of the fan-shaped teeth, and the base circle portion of each cam peach 71 is provided with a positioning groove 712 at the position opposite to the tip position 711 for clamping the roller 9;

[0039] The rotating force is converted into longitudinal force by the double cam peaches 71, bidirectional opening and closing is realized, the closing torque of the double cam peaches 71 and the rack is increased by 36% and the opening torque is reduced by 60% compared with the traditional door closer, the positioning groove 712 can make the door closer quickly and stably in the closed state, and the door closer will not be shaken open back and forth under light external force (wind pressure), and the wind pressure resistance is improved.

[0040] The piston 3 is provided with a shaft hole 32 communicating with the sliding avoiding groove 31 at the end close to the energy storage elastic assembly 5, the pressing block 4 includes a sliding shaft sleeve 41 which is in linear sliding fit with the shaft hole, the sliding shaft sleeve 41 is provided with a limiting through groove 411 in penetration, the shaft hole 32 is provided with a limiting rod 43 in sliding fit with the limiting through groove 411 along the diameter, one end of the sliding shaft sleeve 41 is provided with a pressing ring 412, one end of the energy storage elastic assembly 5 abuts on the pressing ring 412, the other end of the sliding shaft sleeve 41 is connected with a roller shaft 44, and one roller 9 is connected to each of the upper and lower ends of the roller shaft 44.

[0041] The energy storage elastic component 5 comprises a large spring 51 and a small spring 52, the small spring 52 is axially arranged in the large spring 51, one end of the large spring 51 and the small spring 52 abuts against the force adjusting nut 10, the other end of the large spring 51 abuts against the pressing ring 412, and the other end of the small spring 52 is embedded in the sliding shaft sleeve 41 and abuts against the limiting rod 43;

[0042] In the embodiment, the spring diameter and wire diameter of the large spring 51 are larger than those of the small spring 52; when the energy storage elastic component 5 is stressed and stretched, the large spring 51 and the small spring 52 are compressed by different parts of the pressing block 4, but the large spring 51 and the small spring 52 are sleeved inside and outside each other and do not interfere with each other during stretching, so that the large spring 51 and the small spring 52 are not easy to deform, the service life of the large spring 51 and the small spring 52 and the elasticity of the energy storage elastic component 5 are effectively improved, the vertical stability of the spring force is ensured, and the large spring 51 and the small spring 52 are prevented from being damaged due to excessive load.

[0043] The door closing force adjusting assembly 11 comprises a force adjusting screw 111 rotatably connected to the end of the shell 1, the inner end of the force adjusting screw 111 is provided with a threaded section 112, the threaded section 112 is matched with the force adjusting nut 10 to form a screw rod, the outer end of the force adjusting screw 111 extends out of the end cover and is connected with a driven force adjusting bevel gear 113, the shell 1 is provided with an adjusting nut 114, and the adjusting nut 114 is connected with a driving force adjusting bevel gear 115 engaged with the driven force adjusting bevel gear 113; since the door closer is concealed in the installed door, the force adjusting screw 111 is not easy to adjust the force, so the adjusting position is placed on the outer exposed panel through the pair of 90° opposed driven force adjusting bevel gears 113 and driving force adjusting bevel gears 115, and the adjustment is more convenient.

[0044] The two ends of the shell 1 are tightly connected with mounting ears 19, and the adjusting nut 114 is rotatably connected to the mounting ears 19; when the adjusting nut 114 is rotated in the forward and reverse directions, the driving force adjusting bevel gear 115 drives the driven force adjusting bevel gear 113 and drives the force adjusting screw 111 to rotate axially, and finally drives the force adjusting nut 10 to move forward or backward through the screw rod matching, the adjustment is realized by the double bevel gears, the transmission torque can be improved, the transmission precision is high, the load resistance and fatigue resistance are good, general lubrication is not required, the operation is stable, the noise is small, and the like.

[0045] The piston safety valve 13 comprises a valve seat 131, an upper passage 132 and a lower passage 133 are formed in the valve seat 131 and communicated with the oil passing channel 301, a filter screen 134 is arranged between the upper passage 132 and the lower passage 133 and the oil passing channel 301, a door one-way valve 17 is arranged in the upper passage 132, and a door one-way valve 18 is arranged in the lower passage 133.

[0046] The door closing check valve 17 comprises an upper sealing steel ball 171 and a sealing spring 172, the upper passage 132 is provided with a small hole 135 at one end away from the oil passage 301, and the upper sealing steel ball 171 is elastically abutted on the small hole 135 by the sealing spring 172;

[0047] The door opening check valve 18 comprises a lower sealing steel ball 181, the lower passage 133 comprises a front section passage 133a with a diameter larger than the lower sealing steel ball 181 and a rear section passage 133b with a diameter smaller than the lower sealing steel ball 181, the lower sealing steel ball 181 is movably arranged in the front section passage 133a, the lower sealing steel ball 181 can be blocked at the port of the rear section passage 133b, and the front section passage 133a is provided with a protrusion 136 at one end away from the oil passage 301, and the lower sealing steel ball 181 is limited in the front section passage 133a by the protrusion 136;

[0048] And the valve seat 131 is provided with a lock column 137 penetrating the upper passage 132 and the lower passage 133, and the upper sealing steel ball 171 and the sealing spring 172 are limited in the upper passage 132 by the lock column 137.

[0049] One side of the force adjusting nut 10 is provided with a limiting groove 1001 along the movement direction thereof, the shell 1 is provided with a mounting through hole 104 corresponding to the limiting groove 1001, and the mounting through hole 104 is tightly connected with a nut fixing screw 12 which is locked with the limiting groove 1001; by being locked in the limiting groove 1001 by the nut fixing screw 12, the force adjusting nut 10 can be prevented from rotating along the driving shaft when the force adjusting screw 111 is adjusted, so that the force adjusting nut 10 can only move linearly forward and backward.

[0050] The above is the preferred scheme of the utility model, and the basic principle, main features and advantages of the utility model are displayed and described. Those skilled in the art should understand that the utility model is not limited by the above examples, and the above examples and the description in the specification only illustrate the principle of the utility model, and the utility model can have various changes and improvements without departing from the spirit and range of the utility model, and these changes and improvements all fall within the scope of the utility model to be protected, and the protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A cam-rack dual structure door closer, comprising a housing (1), a rotating shaft (2), a piston (3) and a pressing block (4), characterized in that: The piston (3) and the pressing block (4) slide longitudinally in the shell (1), and a sliding avoiding groove (31) is formed on the piston (3), and two racks (8) are formed on both sides of the sliding avoiding groove (31), the rotating shaft (2) is transversely connected on the shell (1) and penetrates in the sliding avoiding groove (31), the rotating shaft (2) is fixedly connected with a following tooth (6) and a cam set (7) in the shell (1), the tooth (6) is engaged with one of the racks (8), the pressing block (4) is movably locked on one end of the piston (3), and one end of the pressing block (4) is rotatably connected with a roller (9) abutting against the edge of the cam set (7), and an energy storage elastic assembly (5) is arranged between the other end of the pressing block (4) and the end of the shell (1), when the rotating shaft (2) rotates, the tooth (6) and the cam set (7) drive the rack (8) and the roller (9) respectively, so that the piston (3) and the pressing block (4) move forward and backward at the same time.

2. The cam-rack dual-structure door closer according to claim 1, characterized in that: The piston (3) is separated by a first oil cavity (101) and a second oil cavity (102) in the shell (1), and an oil passing flow channel (103) is formed in the shell (1) to communicate the first oil cavity (101) and the second oil cavity (102), and hydraulic oil is filled in the shell (1) to reciprocatingly transfer between the first oil cavity (101) and the second oil cavity (102); the piston (3) forms a rotating shaft oil cavity (302) between the front end and the rear end, and an oil passing channel (301) is formed on the piston (3) to communicate the rotating shaft oil cavity (302) and the first oil cavity (101), and a piston safety valve (13) is arranged in the oil passing channel (301).

3. The cam-rack dual-structure door closer according to claim 2, characterized in that: The oil passing flow channel (103) is sequentially provided with a first inlet and outlet oil hole (105) communicating with the first oil cavity (101), a second inlet and outlet oil hole (106), a third inlet and outlet oil hole (107) communicating with the rotating shaft oil cavity (302), a fourth inlet and outlet oil hole (108) and a fifth inlet and outlet oil hole (109) communicating with the second oil cavity (102), and a one-door closing speed adjusting valve (14) is arranged in the first inlet and outlet oil hole (105), a two-door closing speed adjusting valve (15) is arranged in the third inlet and outlet oil hole (107), and an opening door buffer adjusting valve (16) is arranged in the fifth inlet and outlet oil hole (109).

4. The cam-rack dual-structure door closer according to claim 1, characterized in that: The shell (1) is further provided with a force adjusting nut (10) axially sliding, the force adjusting nut (10) is arranged between the end of the energy storage elastic assembly (5) away from the pressing block (4) and the end of the shell (1), and the shell (1) is provided with a door closing force adjusting assembly (11) driving the force adjusting nut (10) to move forward and backward.

5. The cam-rack dual-structure door closer according to claim 1, characterized in that: The cam set (7) comprises two cam peaches (71), the two cam peaches (71) are fixedly connected on the rotating shaft (2) in an up-down manner, the tooth (6) is a fan-shaped tooth and is fixedly connected between the two cam peaches (71), the tip part (711) of each cam peach (71) is arranged in extension corresponding to the direction of the fan-shaped tooth, and a fixed groove (712) is formed on the base circle part of each cam peach (71) at a position opposite to the tip part (711) to clamp the roller (9).

6. The cam-rack dual-structure door closer according to claim 5, characterized in that: The piston (3) is provided with an axle hole (32) with a sliding avoiding groove (31) at one end of the energy storage elastic component (5); the pressing block (4) comprises a sliding axle sleeve (41) in linear sliding cooperation with the axle hole (32), the sliding axle sleeve (41) is provided with a limiting through groove (411) in a penetrating manner, the axle hole is provided with a limiting rod (43) in sliding cooperation with the limiting through groove (411) along the diameter, one end of the sliding axle sleeve (41) is provided with a pressing ring (412), one end of the energy storage elastic component (5) abuts against the pressing ring (412), the other end of the sliding axle sleeve (41) is connected with a roller axle (44), and the upper and lower ends of the roller axle (44) are connected with a roller (9) respectively.

7. The cam-rack dual-structure door closer according to claim 6, characterized in that: The energy storage elastic component (5) comprises a large spring (51) and a small spring (52), the small spring (52) is axially arranged in the large spring (51), one end of the large spring (51) and the small spring (52) abuts against the end of the shell (1), the other end of the large spring (51) abuts against the pressing ring (412), and the other end of the small spring (52) is embedded in the sliding axle sleeve (41) and abuts against the limiting rod (43).

8. The cam-rack dual-structure door closer according to claim 4, characterized in that: The door closing force adjusting component (11) comprises a force adjusting screw (111) rotatably connected to the end of the shell (1), the inner end of the force adjusting screw (111) is provided with a screw thread section (112), the screw thread section (112) is in screw cooperation with the force adjusting nut (10), the outer end of the force adjusting screw (111) extends out of the end cover and is connected with a driven force adjusting bevel gear (113), the shell (1) is provided with an adjusting nut (114), the adjusting nut (114) is connected with a driving force adjusting bevel gear (115) in meshing cooperation with the driven force adjusting bevel gear (113).

9. The cam-rack dual-structure door closer according to claim 2, characterized in that: The piston safety valve (13) comprises a valve seat (131), the valve seat (131) is provided with an upper passage (132) and a lower passage (133) in communication with the oil passing channel (301), the upper passage (132) and the lower passage (133) are provided with a filter screen (134) between the oil passing channel (301), the upper passage (132) is provided with a door one-way valve (17), and the lower passage (133) is provided with an open door one-way valve (18).

10. The cam-rack dual-structure door closer according to claim 4, characterized in that: One side of the force adjusting nut (10) is provided with a limiting recess (1001) along the movement direction, the shell (1) is provided with a mounting through hole (104) corresponding to the limiting recess (1001), and the mounting through hole (104) is tightly connected with a nut fixing screw (12) in locking cooperation with the limiting recess (1001).

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