Underdrive traction mechanism for elevators

Abstract

This utility model discloses a bottom-mounted lifting mechanism for an elevator, including a first safety clamp (1) and a second safety clamp (2) installed at both ends of two elevator lower beams (3). Both the first safety clamp (1) and the second safety clamp (2) are equipped with a lifting mechanism. Each lifting mechanism includes a wire rope lifting plate (4), a linkage plate (5), and a pull rod assembly (6). The mechanism is characterized in that the wire rope lifting plate (4) and the linkage plate (5) are both sleeved on the lifting plate drive shaft (14), and one of the support points along the length of the linkage screw (7) is connected to a guide sleeve (8) on the lower beam (3), with the two being floated. This lifting mechanism supports the middle section of the linkage screw and is floated on the lower beam, thus not affecting the lifting action and preventing the linkage screw from sagging due to excessive length.

Description

Technical Field

[0001] This utility model relates to the field of elevator component technology, specifically a bottom-mounted lifting mechanism for an elevator. Background Technology

[0002] As a vertical transportation tool, the operational safety of elevators is of paramount importance. The safety clamp lifting mechanism (or safety clamp linkage mechanism, triggering mechanism) is the core component of this system. Its function is to quickly and synchronously lift the levers of the safety clamps on both sides when the elevator's operating speed exceeds the rated limit and triggers the speed governor, so that the safety clamp wedges are firmly clamped on the guide rails, stopping the car or counterweight and thus preventing major safety accidents.

[0003] In conventional elevators, the lifting linkage mechanism connecting the safety clamps on both sides of the car is typically a rigid connecting rod (linkage screw). The length of this connecting rod matches the elevator's guide rail pitch (i.e., the distance between the two guide rails). For most standard elevators, this distance is usually within 2 meters, and the length of the linkage rod is relatively short. Its own weight and sag are minimal, and it hardly produces any significant elastic deformation or motion lag during triggering, ensuring instantaneous and synchronous action of the safety clamps on both sides, resulting in high triggering reliability.

[0004] However, with the diversification of modern architectural design, application scenarios with special requirements for elevator shaft space have emerged, such as large freight elevators, special industrial platforms, and luxury sightseeing elevators. The guide rail gauge of these elevators has increased significantly, reaching 3 to 6 meters or even wider. A consequence of this is that the linkage screws connecting the safety clamps on both sides must also be lengthened accordingly to 2 to 4 meters.

[0005] Due to the significant increase in the length of the linkage screw, its own weight has increased substantially. With only hinged support at both ends, the middle section will experience noticeable static sag due to gravity. When the speed limiter actuates and begins to pull up the linkage mechanism, the force must first overcome the additional bending moment and deformation energy generated by the screw's sag, rather than being used entirely to directly trigger the safety brakes. This leads to a decrease in force transmission efficiency and may cause asynchronous action of the two safety brakes—one side clamping first while the other lags behind. This asynchrony can cause minor issues like car tilting and increased vibration during braking, or even serious issues like one side of the safety brake failing to clamp effectively, thus completely losing its safety protection function and posing a significant safety hazard. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a bottom-mounted lifting mechanism for elevators that supports the middle section of the linkage screw and is floatingly connected to the lower beam, so as not to affect the lifting action and to prevent the linkage screw from sagging due to being too long.

[0007] The technical solution of this utility model is to provide a lower-mounted lifting mechanism for an elevator with the following structure: a first safety clamp and a second safety clamp installed at both ends of two elevator lower beams; each of the first and second safety clamps is equipped with a lifting mechanism; each lifting mechanism includes a wire rope lifting plate, a linkage plate, and a pull rod assembly; characterized in that: the wire rope lifting plate and the linkage plate are both sleeved on the lifting plate drive shaft; one end of the pull rod assembly of one group is connected to the linkage plate of the first safety clamp, and the other end is connected to one end of the linkage screw; one end of the pull rod assembly of the other group is connected to the linkage plate of the second safety clamp, and the other end is connected to the other end of the linkage screw; one of the support points along the length direction of the linkage screw is connected to the guide sleeve on the lower beam, and the two are floatingly connected.

[0008] The connection between the two is described as follows: one of the support points along the length of the linkage screw is connected to the guide sleeve on the lower beam and the two are connected by floating means that the guide sleeve is a guide plate with an upward notch, and the linkage screw is provided with a floating block 0, which is movably embedded in the notch of the guide sleeve.

[0009] The floating block, together with the connecting screw, floats radially along the connecting screw.

[0010] The floating block is arranged along the direction of the vertical linkage screw axis. The two sides of the floating block are respectively provided with grooves arranged vertically. The groove on each side is embedded in the side wall of the notch on the same side, and there is a gap between the side wall of the notch and the bottom surface of the groove.

[0011] The length of the floating block is greater than the width of the notch, and the distance between the bottom surfaces of the two grooves on the side of the floating block is less than the width of the notch.

[0012] The floating block has a through hole at its center, and the linkage screw passes through the through hole.

[0013] The wire rope lifting plate and the linkage plate are connected by a keyway structure for axial adjustment and locking after adjustment.

[0014] The outer wall of the lifting plate drive shaft is provided with a keyway parallel to the axis. After the wire rope lifting plate and the linkage plate slide axially, the axial position is locked by tightening the flat key with bolts.

[0015] With the above structure, this utility model has the following advantages: The middle of the linkage screw is supported, allowing it to slide up and down without affecting the lifting action, and preventing the rod from sagging due to excessive length. The floating support provides an additional support point for the core section of the linkage screw, also preventing the linkage screw from sagging due to excessive length, thus not affecting the lifting action. Furthermore, it fundamentally ensures the reliability, synchronization, and instantaneity of the ultra-wide guide rail gauge elevator safety clamp system's operation.

[0016] As an improvement, the connection between one of the support points along the length of the linkage screw and the guide sleeve on the lower beam, and the two being connected by a floating connection, means that the guide sleeve is a guide plate with an upward notch, and the linkage screw is provided with a floating block, which is movably embedded in the notch of the guide sleeve, so as to achieve vertical floating.

[0017] As an improvement, the floating block floats together with the linkage screw along the radial direction of the linkage screw, so that the linkage screw has directional movement when moving up and down.

[0018] As an improvement, the floating block is arranged along the direction of the vertical linkage screw axis, and the two sides of the floating block are respectively provided with grooves arranged vertically. The groove on each side is embedded in the side wall of the notch on the same side, and there is a gap between the side wall of the notch and the bottom surface of the groove to provide space for lateral sliding.

[0019] As an improvement, the length of the floating block is greater than the width of the notch, and the distance between the bottom surfaces of the two grooves on the side of the floating block is less than the width of the notch, thus limiting the left and right sides and preventing the floating block from falling off the notch.

[0020] As an improvement, the wire rope lifting plate, the linkage plate and the lifting plate drive shaft are connected by a keyway structure for axial adjustment and locking after adjustment. This structure can increase the torsional resistance by adding a keyway to the lifting plate drive shaft.

[0021] As an improvement, the outer wall of the lifting plate drive shaft is provided with a keyway parallel to the axis. After the wire rope lifting plate and the linkage plate slide axially, the axial position is locked by bolting the flat key. It can be freely adjusted left and right to adapt to different elevator car beam widths and increase the applicability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation of the elevator safety clamp and lifting mechanism of this utility model.

[0023] Figure 2 for Figure 1 The main view.

[0024] Figure 3 This is a schematic diagram showing the connection between the safety clamp and the lifting mechanism of the elevator according to this utility model.

[0025] Figure 4 for Figure 3 Enlarged schematic diagram of part A.

[0026] Figure 5 This is a schematic diagram showing the connection between the linkage screw and the floating block.

[0027] Figure 6 for Figure 5 An explosion diagram.

[0028] Figure 7 for Figure 5 A cross-sectional schematic diagram.

[0029] Figure 8 This is an assembly diagram of the safety clamp and lifting plate.

[0030] As shown in the figure: 1. First safety clamp, 2. Second safety clamp, 3. Elevator lower beam, 4. Wire rope lifting plate, 5. Linkage plate, 6. Pull rod assembly, 7. Linkage screw, 8. Guide sleeve, 9. Notch, 10. Floating plate, 11. Groove, 12. Keyway, 13. Through hole, 14. Lifting plate drive shaft. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] like Figure 1-8 As shown, the lower-mounted lifting mechanism of the elevator of this utility model includes a first safety clamp 1 and a second safety clamp 2 installed at both ends of two lower elevator beams 3. Each end of the two lower elevator beams 3 is provided with a vertical beam, and the top of the vertical beams is two upper beams.

[0033] Both the first safety clamp 1 and the second safety clamp 2 are equipped with a set of lifting mechanisms; each set of lifting mechanisms includes a wire rope lifting plate 4, a linkage plate 5, and a pull rod assembly 6; the wire rope lifting plate 4 and the linkage plate 5 are both sleeved on the lifting plate drive shaft 14.

[0034] like Figure 1 and Figure 8 As shown, the wire rope lifting plate 4 and the linkage plate 5 are both sleeved on the lifting plate drive shaft 14. Specifically, the wire rope lifting plate 4, the linkage plate 5, and the lifting plate drive shaft 14 are connected by a keyway structure for axial adjustment and locking after adjustment. The outer wall of the lifting plate drive shaft 14 is provided with a keyway 12 parallel to the axis. After the wire rope lifting plate 4 and the linkage plate 5 slide axially, their axial position is locked by bolting the keyway. The center holes of the wire rope lifting plate 4 and the linkage plate 5 both have threaded holes. The keyway structure allows for free left and right adjustment to accommodate different elevator car beam widths.

[0035] like Figure 1 and Figure 2As shown, one set of pull rod assemblies 6 of the lifting mechanism has one end connected to the linkage plate 5 of the first safety clamp 1 and the other end connected to one end of the linkage screw 7; another set of pull rod assemblies 6 has one end connected to the linkage plate 5 of the second safety clamp 2 and the other end connected to the other end of the linkage screw 7; one of the support points along the length direction of the linkage screw 7 is connected to the guide sleeve 8 on the lower beam 3, and the two are floatingly connected. The floating connection can slide up and down without affecting the lifting action, and also prevents the rod from sagging due to excessive length. The floating support provides an additional support point for the linkage screw of the core section, and also prevents the linkage screw from sagging due to excessive length, thus not affecting the lifting action.

[0036] like Figure 3-7 As shown, the connection between the guide sleeve 8 on the lower beam 3 and one of the support points along the length of the linkage screw 7 is floating. This means that the guide sleeve 8 is a guide plate with an upward-facing notch 9, and the linkage screw 7 is provided with a floating block 10, which is movably embedded in the notch 9 of the guide sleeve 8. The floating block 10 can float in the vertical direction.

[0037] The floating block 10 floats together with the linkage screw 7 along the radial direction of the linkage screw 7. The floating block 10 has a through hole 13 at its center, and the linkage screw 7 passes through the through hole 13.

[0038] like Figure 6 and Figure 7 As shown, the floating block 10 is arranged along the axis of the vertical linkage screw 7. The floating block 10 has grooves 11 on both sides, arranged vertically. Each groove 11 is embedded in the side wall of the notch 9 on the same side, and there is a gap between the side wall of the notch 9 and the bottom surface of the groove 11. The grooves 11 serve as guides for vertical sliding, preventing the floating block 10 from falling out of the notch 9.

[0039] The length of the floating block 10 is greater than the width of the notch 9, and the distance between the bottom surfaces of the two grooves 11 on the side of the floating block 10 is less than the width of the notch 9. This provides left and right limiting to prevent the floating block from falling out of the notch.

Claims

1. A bottom-mounted lifting mechanism for an elevator, comprising a first safety clamp (1) and a second safety clamp (2) installed at both ends of two elevator lower beams (3), wherein both the first safety clamp (1) and the second safety clamp (2) are provided with a set of lifting mechanisms; each set of lifting mechanisms includes a wire rope lifting plate (4), a linkage plate (5), and a pull rod assembly (6); characterized in that: The wire rope lifting plate (4) and the linkage plate (5) are both sleeved on the lifting plate drive shaft (14). One end of one set of the pull rod assembly (6) is connected to the linkage plate (5) of the first safety clamp (1) and the other end is connected to one end of the linkage screw (7). One end of the other set of the pull rod assembly (6) is connected to the linkage plate (5) of the second safety clamp (2) and the other end is connected to the other end of the linkage screw (7). One of the support points along the length direction of the linkage screw (7) is connected to the guide sleeve (8) on the lower beam (3) and the two are floatingly connected.

2. The lower-mounted lifting mechanism of the elevator according to claim 1, characterized in that: One of the support points along the length direction of the linkage screw (7) is connected to the guide sleeve (8) on the lower beam (3) and the two are connected by floating means that the guide sleeve (8) is a guide plate with an upward notch (9), and the linkage screw (7) is provided with a floating block (10), which is movably embedded in the notch (9) of the guide sleeve (8).

3. The elevator below-the-pit traction sheave according to claim 2, characterized in that: The floating block (10) floats together with the linkage screw (7) along the radial direction of the linkage screw (7).

4. The lower-mounted lifting mechanism of the elevator according to claim 2 or 3, characterized in that: The floating block (10) is arranged along the direction of the vertical linkage screw (7) axis. The floating block (10) has grooves (11) arranged vertically on both sides. The grooves (11) on each side are embedded in the side wall of the notch (9) on the same side, and there is a gap between the side wall of the notch (9) and the bottom surface of the groove (11).

5. The elevator's underpinned traction machine according to claim 3, characterized in that: The length of the floating block (10) is greater than the width of the notch (9), and the distance between the bottom surfaces of the two grooves (11) on the side of the floating block (10) is less than the width of the notch (9).

6. The elevator's underpinned traction machine according to claim 4, characterized in that: The floating block (10) has a through hole (13) at its center, and the linkage screw (7) passes through the through hole (13).

7. The elevator's underpinned traction machine according to claim 1, characterized in that: The wire rope lifting plate (4), the linkage plate (5), and the lifting plate drive shaft (14) are connected by a keyway structure for axial adjustment and locking after adjustment.

8. The below-the-elevator-pit traction machine of claim 1, wherein: The outer wall of the lifting plate drive shaft (14) is provided with a keyway (12) parallel to the axis. After the wire rope lifting plate (4) and the linkage plate (5) slide axially, the axial position is locked by tightening the flat key with bolts.

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